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 2014 

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:Very Good [8 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]
Evaluation:Functionally obsolete [2]
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. ratingEvaluationDeckSuper.Sub.ADT
August 201494.9Functionally obsoleteGoodVery GoodGood11200
April 201395.2Functionally obsoleteGoodVery GoodGood8200
July 201195.6Functionally obsoleteGoodVery GoodVery Good8200
November 200995.2Not deficientGoodVery GoodVery Good16200
December 200795.2Not deficientGoodVery GoodVery Good16200
January 200695.4Not deficientGoodVery GoodVery Good11600
July 200294.4Functionally obsoleteExcellentExcellentVery Good12409
March 200164.0Structurally deficientPoorPoorPoor12400
September 199964.0Structurally deficientPoorPoorPoor12400
March 199882.3Functionally obsoleteFairFairFair12400
July 199682.3Functionally obsoleteFairFairFair12400
May 199482.9Functionally obsoleteFairFairFair12400
October 199382.9Functionally obsoleteFairFairFair12400
July 199283.9Functionally obsoleteSatisfactoryFairSatisfactory12400
March 199183.9Functionally obsoleteSatisfactoryFairSatisfactory12400