HomeMy WebLinkAboutGateway pptlow,a CiTv
GATEWAY Gateway Proje I
Tonight's Objectives:
• Work Session
• Answer Questions asked at the September 17th Work Session
and correspondence
• Review Staff Recommendations
• Answer Additional Questions from Council
• Formal Meeting
• Outline Staff Recommendations
• Provide Opportunity for Public Input
• No formal action will be taken tonight
GATEWAY IOWA ciTY
• • • Questions
• Roadway elevations
• Flooding issues
• Construction
• Design considerations / footprint reduction
GATEWAY IOWA ciTV
Roadway Elevations
■ Is it correct that Dubuque Street has been closed 150 days in the
last 20
years
due to flooding? Would
Dubuque
street have been
closed
only
6
days
if the
road
/bridge
were at a
100 + 1 elevation?
• Both statements are correct
• Does not include closures from local heavy rains
■ Have you assessed any other intermediate flood levels?
• Looked at 200 +1 elevation
• Approximately 3.4 feet higher than 100 +1 elevation
• Updated comparisons for backwater, cost and cross sections in council
packet
IOWA CITY
GATEWAY
]10
]oo
690
500-year Flood f Foot Flood Level
Mayflower Residence Hall
2008 lootl +1 Foot Flood Level
660 Removable Floo0wall 200 - year + l FOOL Flood Level
100- year +1 Foot Flood Level
6]0 No-Build (Existing Grade)
660
650 - 2008 Flood
'.
993 Flood
610
630
Dubuque Street @ Maynower Residence Hall a 15 30 60'
IOWA CITY
GATEWAY
�r
S Mr +1 FwI Flm L l
3000 FbW-t F. Flw Leval
2_ry rr1 FW F"LeV
1WMr +1FwIFlw L l
Nobuiq (Ens0e9 G2tle)
� f
3000 FbW
003 Fb
Dubuque Street 36.79 o is 30 60-
GATEWAY IOWA ciTY
Roadway Elevations
Why is the use of Hesco barriers in combination with a
lower roadway elevation not a reasonable option?
• Risk to keep Dubuque Street open with temporary measures
• Impacts to traffic during deployment/ removal
• Pedestrian / bicycle traffic not possible
• Estimated cost of approx. $690,000 to deploy per event
• 85% reimbursable for federally declared disaster deployment
ATFWAV low,a CiTv
Roadway Elevations
(i
How will water runoff from the east side of Dubuque
Street be handled?
• Runoff conveyed from east to west to river
• Will still use open ditches and cross - culverts
• Project will reconstruct and upsize both for better conveyance
• Will not be a certified levee when complete
Iowa CiTv
Flooding issues
GATEWAY
Can more information be provided on future road closures by
various impact levels?
■ Can only look to past events
What is the economic impact when Dubuque Street closes?
■ Staff working with Economic Development Division, Summer of Arts and
the Chamber of Commerce to try to develop impact of 2008 and 2013
How will the project relate to the Corps operation plan for the
Coralville Reservoir?
■ Maximum release of 20,000 cfs could be achieved without impact to
elevated Dubuque Street
0 Construction Issues
How would cost overruns during construction be paid for?
■ Current estimate includes 20% contingency
• Cost overruns paid for by G.O. Bond proceeds
• Wastewater project is over 70% complete with 1% change orders
Cost clarification between Gateway and No Build options?
■ Cost estimates presented for Gateway options were for construction only
and did not include Final Design, Construction Admin and Inspection Fees
■ Trunk sewer not included
■ No Build cost estimate did include the Final Design, Construction Admin
and Inspection Fees
0 Design Considerations
Travel lanes in the Preferred Alternative are 12' wide. Can
this width be reduced and if so, what will the affects be?
• This is the standard for Iowa DOT Design Manual, Statewide
Urban Design and Specifications, and AASHTO Green Book
• Accommodates all vehicles that currently use the corridor
• Reducing lane width could lead to an increase in crashes
� Design Considerations
To increase safety on Dubuque St and Park Rd, would it be
better to reduce speed from 35 mph to 25 mph?
Would a reduction in lane width result in a reduction
in speed?
• Currently an Arterial street at 35mph
• Speed management will be studied during design
• Lane width reduction could lead to reduced speed, but lane
width reduction could also lead to increase in crashes
■ 1 -80 /Dubuque is now signal controlled as is Foster /Dubuque
0 Design Considerations
Could a pedestrian- activated signal be installed
at M ayf I owe r?
• Will be considered during final design
• Could have positive impact on ped safety and speed control
• Other locations with pedestrians crossing in corridor
• Would have a negative impact of traffic delay
2Design Considerations
The Preferred Alternative recommends wide sidewalks on both
sides of Dubuque Street. Can these widths be minimized or perhaps
eliminated on the east side?
• Purpose and Need to maintain and enhance amenities
• Brown to Foster walk was frequent request at public meetings
• Reducing widths or eliminating east sidewalk counter to goals
• Would reduce walkability of corridor
• Iowa River Trail most heavily used in the metro area
• North of Kimball, roadway shifted west to reduce impact
0 Design Considerations
Can parkway widths be reduced?
• Would create winter maintenance issues
• Would reduce safety buffer
Can the median width be reduced from 0 — 25' to 0 —12'?
• South of Kimball — No median proposed
• Kimball to Ridge — alignment shifted west
• Same as current medians to maintain character of corridor
• Provides storage for Cambus and turning vehicles
0 Design Considerations
It has been indicated that a right turn lane from
southbound Dubuque to westbound Park is warranted by
the MPOJC. Why is a new turn lane necessary?
• Right turn lane warranted threshold is apx. 300 vehicles /hour
• Current traffic is 715 SB right turns on to Park Rd in morning
• Right turn lane will increase function and safety
• Lane would not impact the wooded bluff
� Design Considerations
Are dual left turn lanes required on eastbound Park Road? Can we
have a shared right and left -turn lane to reduce the width of the
new bridge?
■ Dual left needed to obtain acceptable service levels
• Will help anticipated growth in Hancher traffic turning NB
• Will analyze more closely during final design
Is the 3rd lane on Park Road really needed?
■ Recommended by MPOJC in 2008
■ Part of approved CIP
■ Helps Park Road and Hancher traffic operate at acceptable service levels
Design Considerations
Are there additional options available for shrinking the
horizontal footprint and minimizing impact along the Bella
Vista hillside at Dubuque and Park Road?
• Retaining walls along east side of sidewalk
• Steeper slopes
• Tree wells for protecting mature trees
• Tree replacement
• Native plantings along affected hillside and slope
0 Design Considerations
What are the design criteria affecting clear zone and the
use of barriers?
• Look to Iowa DOT Design Standards for clear zone and barrier
requirements
• Setback of retaining wall in the Preferred Alternative greater
than required clear zone
• The top of wall does not require a crash worthy barrier if it is
outside the required clear zone
• Clear zone will be verified and analyzed in more detail during
design
IOWA ciTY
• - • •
GATEWAY
• Level of Protection for Dubuque Street
• Backwater Reduction Goals
• Structural Type of the Bridge
12 Recommendation for
Elevation of Dubuque Street
Recommended minimum level of protection for Dubuque
Street: One foot above the 2008 flood.
* Including one day for cleaning, inspection and repair
Post Flood of `93
Projects to Consider,
All Designed to 100 year + 1'
• Rocky Shore Drive /Highway 6 Flood Gate
• Riverside Drive Lift Station
• South Gilbert /Stevens Drive Flood Gate
• Floodplain Map Update
Rocky Shore Drive / Highway 6
Flood Gate , shoji
1
. y
a 71 M169
2011: .
After 2008 we are now
implementing a $6.6M
upgrade that is part of a 5
project $26.9M collaborative
regional effort to protect this
area.
South Gilbert / Stevens Drive
Flood Gate
I�:
201
9
After 2008 upgrades to the
existing level of protection
were investigated, but the
estimated cost exceeded
funding that was available.
Floodplain Map Update
2013
� IJl
After 2008 the Floodplain
Management Ordinance was
200Q amended to require
O protection to 1' above the
500 year event.
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental ConstrulConstructi
Construct"Construction
Elevation Reduction Improvement
Elevation Height of on Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
50Gyr +1'
100yr +1' 20Gyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67M
$34.26M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
SOOyr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
•
•
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67M
$34.26M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
- Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
0 .
Bridge Type
Low Steel Backwater Incremental
Deck Increment7Estimate i Constr7S34.26
on
Construction
Elevation Reduction Improvement
Elevation Height of on Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Dec Estimat
Estimate
Reduction
with
with
Dubuqt
Dubuqueat
at
S00yr +1'
200yr +r
100yr +1'
3.4"
660.20
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
` Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental
Constructs Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of
on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck
Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67M
$34.26M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0"
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0"
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Constructi
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
' Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
- Arch
`• Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Constructs
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
C6 - Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
=.. Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
_
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
'��
Through
2008 +1'
S.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
`•
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0"
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Constructi
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
e6 _ Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
- Through
100yr +1'
3.4"
656.87
$35.99 M
$37.58 M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
36.70M
$38.47M
_ Arch
`�
Through
SOOyr +1'
S.8"
0.6"
661.53
19.0"
36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Constructs
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr+ 1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
- Deck Girder
500yr+ 1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
& _ Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
`• Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater
Incremental
Deck IncrementponCost
tructi
Construction
Construction
Elevation Reduction
Improvement
Elevation Height of
ost
Cost
Cost
GATEW AY
at Idyllwild
in Backwater
Bridge Deck
Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
M 6 _ Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
- Deck Girder
500yr +1'
7.0"
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
_ Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99 M
$37.58 M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
`• Through
SOOyr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Construct! Constructi
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr+ 1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
M6 _ Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
_ Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
C6 - Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0"
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
2008 +1'
S.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
`• Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Constructs
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
- Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
& _ Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
`• Through
500yr +1'
5.8"
0.6"
661.53
19.0"
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Constructs
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
- Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0'
$34.20 M
$35.01 M
$35.34 M
$36.65 M
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr +1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
Arch
& _ Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
`• Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C -
Deck Girder
500yr +1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
538.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructs Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
SOOyr+ 1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
SOOyr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
500yr+ 1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63 M
$35.01 M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
500yr+ 1'
7.0'
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
500yr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
4.9"
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
500yr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
S.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
ra
C
Deck Girder
500yr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
S.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
S.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
500yr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
665.03
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 20Dyr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY
s M
-
Bridge Type
Low Steel Backwater Incremental
Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement
Elevation Height of on Cost on Cost
Cost
Cost
G ATEWAY
at Idyllwild in Backwater
Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction
with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
$38.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA CITY-
s M's 16rol
Bridge Type
Low Steel Backwater Incremental Deck Incremental Constructi Construct!
Construction
Construction
Elevation Reduction Improvement Elevation Height of on Cost on Cost
Cost
Cost
GATEWAY
at Idyllwild in Backwater Bridge Deck Estimate Estimate
Estimate
Estimate
Reduction with with
with
with
Dubuque Dubuque
Dubuqueat
Dubuqueat
at at
2008 +1'
500yr +1'
100yr +1' 200yr +1'
Deck Girder
100yr +1'
3.4"
660.20
$32.67 M
$34.26 M
Deck Girder
200yr +1'
6.1"
2.7"
662.52
27.8"
$34.63M
$35.01M
Deck Girder
2008 +1'
6.6"
0.5"
663.45
11.2"
$33.41
$35.17M
Deck Girder
SOOyr+ 1'
7.0"
0.4"
19.0"
$34.20 M
$35.01 M
$35.34 M
$36.65 M
_
EA Preferred
Alternative
Deck Arch
100yr +1'
3.6"
659.20
$36.01 M
$37.59 M
Deck Arch
200yr +1'
4.7"
1.1"
661.52
27.8"
$37.96M
$38.34M
Deck Arch
2008 +1'
5.2"
0.5"
662.45
11.1"
$36.71M
$38.48M
Deck Arch
500yr +1'
5.6"
0.4"
664.03
19.0'
$36.94 M
$38.33 M
$38.66 M
$39.98 M
Through
100yr +1'
3.4"
656.87
$35.99M
$37.58M
Arch
Through
200yr+ 1'
1.5"
659.02
25.8"
$37.93 M
8.31 M
-c Arch
Through
2008 +1'
5.2"
0.3"
659.95
11.1"
$36.70M
$38.47M
Arch
Through
500yr +1'
5.8"
0.6"
661.53
19.0'
$36.90 M
$38.30 M
$38.63 M
$39.60 M
Arch
IOWA ciTY
GATEWAY Council Q&A