51ST ST over I- 90,94 RYAN & CTA


+41.80170, -87.63114
41°48'06" N, 87°37'52" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.


Name:51ST ST over I- 90,94 RYAN & CTA
Structure number:016115700000000
Old structure number:000016115726291 (from 1992 edition)
Location:3.2 M S I-55
Purpose:Carries highway overpass over highway and railroad
Route classification:Collector (Urban) [17]
Length of largest span:71.9 ft. [21.9 m]
Total length:276.3 ft. [84.2 m]
Roadway width between curbs:78.1 ft. [23.8 m]
Deck width edge-to-edge:95.1 ft. [29.0 m]
Vertical clearance below bridge:15.1 ft. [4.6 m]
Skew angle:
Owner:State Highway Agency [01]
Year built:1962
Year reconstructed:2004
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:5
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: September 2014 

Status:Open, no restriction [A]
Average daily traffic:10,400 [as of 2014]
Truck traffic:8% of total traffic
Deck condition:Good [7 out of 9]
Superstructure condition:Very Good [8 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Superior to present desirable criteria [9]
Underclearances appraisal:Meets minimum tolerable limits to be left in place as is [4]
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:77.3 tons [70.3 metric tons]
Sufficiency rating:95.0

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
September 201495.0Not deficientGoodVery GoodSatisfactory10400
October 201296.0Not deficientGoodVery GoodGood20600
October 201086.6Not deficientGoodVery GoodGood215000
December 200896.0Not deficientGoodVery GoodVery Good20600
January 200696.4Not deficientVery GoodVery GoodVery Good11900
September 200496.4Not deficientVery GoodExcellentVery Good11900
October 200265.1Structurally deficientPoorFairPoor11900
December 200081.5Structurally deficientPoorFairFair7900
December 199981.5Structurally deficientPoorFairFair7900
March 199879.1Structurally deficientPoorFairFair14900
July 199681.1Functionally obsoleteFairFairFair14900
June 199483.6Not deficientFairFairFair14900
November 199384.0Not deficientFairFairFair10600
July 199284.0Not deficientFairFairFair10600
March 199184.0Not deficientFairFairFair10600