31ST ST over I- 90,94 RYAN & CTA


+41.83823, -87.63063
41°50'18" N, 87°37'50" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:31ST ST over I- 90,94 RYAN & CTA
Structure number:016115900000000
Old structure number:000016115926293 (from 1992 edition)
Location:0.9 M S I-55
Purpose:Carries highway overpass over highway and railroad
Route classification:Minor Arterial (Urban) [16]
Length of largest span:75.8 ft. [23.1 m]
Total length:397.3 ft. [121.1 m]
Roadway width between curbs:65.9 ft. [20.1 m]
Deck width edge-to-edge:87.9 ft. [26.8 m]
Vertical clearance below bridge:14.4 ft. [4.4 m]
Owner:State Highway Agency [01]
Year built:1961
Year reconstructed:2001
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:7
Main spans material:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]

Latest Available Inspection: August 2016

Good/Fair/Poor Condition:Good
Status:Open, no restriction [A]
Average daily traffic:11,200 [as of 2014]
Truck traffic:9% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Better than present minimum criteria [7]
Deck geometry appraisal:Better than present minimum criteria [7]
Underclearances appraisal:Basically intolerable requiring high priority of corrrective action [3]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Scour condition:Bridge not over waterway. [N]
Operating rating:98.0 tons [89.1 metric tons]
Inventory rating:61.7 tons [56.1 metric tons]
Sufficiency rating:94.9
Recommended work:Widening of existing bridge with deck rehabilitation or replacement. [34]
Estimated cost of work:$3,779,000

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
August 201694.9GoodGoodGoodGoodFO11200
August 201494.9GoodGoodVery GoodGoodFO11200
April 201395.2GoodGoodVery GoodGoodFO8200
July 201195.6GoodGoodVery GoodVery GoodFO8200
November 200995.2GoodGoodVery GoodVery Good-16200
December 200795.2GoodGoodVery GoodVery Good-16200
January 200695.4GoodGoodVery GoodVery Good-11600
July 200294.4GoodExcellentExcellentVery GoodFO12409
March 200164.0PoorPoorPoorPoorSD12400
September 199964.0PoorPoorPoorPoorSD12400
March 199882.3FairFairFairFairFO12400
July 199682.3FairFairFairFairFO12400
May 199482.9FairFairFairFairFO12400
October 199382.9FairFairFairFairFO12400
July 199283.9FairSatisfactoryFairSatisfactoryFO12400
March 199183.9FairSatisfactoryFairSatisfactoryFO12400