Rating:
2 votes

I-74 Bridge

Scott County, Iowa, and Rock Island County, Illinois
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Photos 

Iowa shore looking north

Photo taken by Nathan Morton in Sept. 07

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Map 

Street Views 

View Uglybridges.com report

Facts 

Overview
Pair of suspension bridges over the Mississippi River on I-74 between Bettendorf and Moline
Location
Scott County, Iowa, and Rock Island County, Illinois
Status
Open to traffic
Future prospects
Scheduled for demolition and replacement.
History
Northbound bridge built 1935; southbound built 1960; both rehabilitated 1975
Builder
- 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
+41.52200, -90.51330   (decimal degrees)
41°31'19" N, 90°30'48" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/707484/4599692 (zone/easting/northing)
USGS topographic map
Davenport East
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 (as of 06/2010)
Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 49.6 (out of 100)
Average daily traffic (as of 2011)
30,350

Categories 

Built 1935 (1,456)
Built during 1930s (8,551)
Continuous (902)
Doomed (806)
Functionally obsolete (7,040)
Have street view (9,897)
I-74 (1)
Illinois (2,500)
Iowa (3,507)
Mississippi River (155)
NR-eligible (3,750)
Navigable waterway (1,448)
Open (28,315)
 Owned by state (9,809)
Pony truss (13,217)
Ralph Modjeski (27)
Rock Island County, Illinois (40)
Scott County, Iowa (53)
Skewed (4,080)
Span length 500-1000 feet (313)
State line crossing (514)
Suspension (278)
Total length over 2500 feet (587)
Truss (23,574)
Warren pony truss (1,987)
Warren truss (3,961)

Update Log 

  • 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

Sources 

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Comments 

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-001cc4c002e0.html#0