Rating:
3 votes

I-74 Bridge

Scott County, Iowa, and Rock Island County, Illinois

Photos 

Iowa shore looking north

Photo taken by Nathan Morton in Sept. 07

Enlarge

BH Photo #127552

Map 

Street Views 

Facts 

Overview
Pair of suspension bridges over the Mississippi River on I-74 between Bettendorf and Moline
Location
Moline, Scott County, Iowa, and Rock Island County, Illinois
Status
Intact but closed to all traffic
Future prospects
Scheduled for demolition and replacement.
History
Northbound bridge built 1935; southbound built 1960; both rehabilitated 1975
Builders
- Kansas City Bridge Co. of Kansas City, Missouri (Substructure)
- McClintic-Marshall Co. of Chicago, Illinois & Pittsburgh, Pennsylvania (Superstructure)
- Ralph Modjeski of Bochnia, Poland (Chief Engineer)
Design
Wire suspension
Dimensions
Length of largest span: 739.9 ft.
Total length: 5,016.4 ft. (1.0 mi.)
Deck width: 23.3 ft.
Vertical clearance above deck: 18.0 ft.
Recognition
Eligible for the National Register of Historic Places
Also called
Iowa-Illinois Memorial Bridge
Approximate latitude, longitude
+41.51956, -90.51330   (decimal degrees)
41°31'10" N, 90°30'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/707492/4599421 (zone/easting/northing)
Quadrangle map:
Davenport East
Average daily traffic (as of 2018)
36,300
Inventory numbers
IA 47280 (Iowa bridge number)
IL 081-9901 (Illinois bridge number)
IL 081-9902 (Illinois bridge number)
BH 14376 (Bridgehunter.com ID)
Inspection report (as of August 2018)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Satisfactory (6 out of 9)
Sufficiency rating: 48.5 (out of 100)
View more at BridgeReports.com

Categories 

Bettendorf, Iowa (17)
Built 1935 (1,490)
Built during 1930s (12,168)
Closed (2,760)
Continuous (2,632)
Deck truss (1,925)
Doomed (1,066)
Have street view (28,910)
Historic Bridge Weekend 2013 (145)
Illinois (4,929)
Interstate 74 (5)
Iowa (6,793)
Kansas City Bridge Co. (144)
McClintic-Marshall Co. (95)
Mississippi River (232)
Moline, Illinois (13)
NR-eligible (4,107)
Navigable waterway (2,204)
 Owned by state (16,555)
Painted Surf Green (11)
Painted green (160)
Pony truss (17,012)
Ralph Modjeski (51)
Rock Island County, Illinois (79)
Scott County, Iowa (149)
Skewed (5,012)
Span length 500-1000 feet (403)
State line crossing (913)
Suspension (788)
Total length over 2500 feet (951)
Truss (35,469)
US 6 (130)
Warren deck truss (667)
Warren pony truss (3,558)
Warren truss (7,002)
Wire/cable Suspension (141)

Update Log 

  • August 19, 2015: Updated by Luke: Added category "US 6" + two scans of a AAA pamphlet via Dave Darby
  • February 22, 2015: Photo imported by Dave King
  • January 24, 2015: New photos from Jason Smith
  • March 16, 2014: New photo from Luke Harden
  • November 28, 2012: Photo imported by Luke Harden
  • November 17, 2012: New photos from Luke Harden
  • July 28, 2012: Updated by Luke Harden: Edited name to what it is locally referred to as.
  • April 12, 2010: Updated by Nathan Holth: Updated bridge info.
  • March 3, 2009: New photo from Quinn Phelan
  • November 20, 2008: Updated by Kim Harvey
  • November 13, 2008: New photo from Nathan Morton

Related Bridges 

Sources 

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Comments 

I-74 Bridge
Posted May 16, 2022, by Lyon Wonder (lyon_wonder [at] yahoo [dot] com)

The remaining approach span to the old bridge in Illinois is being torn down.

https://qctimes.com/news/local/barb-ickes/ickes-demo-of-i-74...

I-74 Bridge
Posted December 9, 2021, by Lyon Wonder (lyon_wonder [at] yahoo [dot] com)

The old I-74 bridge is now completely closed to all traffic and scheduled for demolition sometime in 2022.

I-74 Bridge
Posted April 30, 2021, by Lyon_Wonder (lyon_wonder [at] yahoo [dot] com)

There's talk of preserving the pony truss section and toll plaza on the Illinois side of the river and converting it into a pier.

https://qctimes.com/news/local/more-talks-on-turning-toll-pl...

I-74 Bridge
Posted November 13, 2020, by Tony Dillon (spansaver [at] hotmail [dot] com)

EH...

I-74 Bridge
Posted November 13, 2020, by Lyon_Wonder (lyon_wonder [at] yahoo [dot] com)

I think it's time to add the new I-74 tied-arch bridge on bridgehunter since the westbound span is now finished and open to traffic.

https://www.kwqc.com/2020/11/13/iowa-bound-portion-of-new-i-...

I-74 Bridge
Posted January 10, 2018, by Luke

It's been on the chopping block for the better part of a decade.

I-74 Bridge
Posted January 10, 2018, by Kenny Fairhurst (dwf0403 [at] gmail [dot] com)

The bridge is unfortunately slated for demolition.

http://www.i74riverbridge.com/

I-74 Bridge
Posted April 18, 2016, by Jodi Christman (masterofchaos [at] outlook [dot] com)

New bridge in progress. From Modjeski & Masters website:

http://www.modjeski.com/projects/detail.aspx?I-74-Mississipp...

I-74 Bridge
Posted August 19, 2015, by Dave Darby (dwdarby [at] aol [dot] com)

US 6

I-74 Bridge
Posted March 16, 2014, by David Sebben (nebbes61 [at] yahoo,com)

A ground level view of the I-74 Bridge from the Iowa side.

Mississippi River I-74 Bridge
Posted May 14, 2012, by Andy

Here is another atricle on the funding for the bridge replacement. I know this has been in the works for a while and htey are already working on projects along I-74 to accomodate the replacement but I didn't knwo that the entire funding had not been finalized. It looks like this will still take a few more years to even start the construction.

http://www.dot.state.il.us/press/r051112.html

Mississippi River I-74 Bridge
Posted April 15, 2011, by Kim Harvey

The Quad Cities Times posted an article with historic photos of the bridge:

http://qctimes.com/collection_e4850eda-6623-11e0-9c3f-001cc4...