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MICHIGAN AVE over MAIN BR CHICAGO RIV

Map 

Coordinates:
+41.88851, -87.62433
41°53'19" N, 87°37'28" W
Source: National Bridge Inventory
Information not verified. Use at your own risk.

Facts 

Name:MICHIGAN AVE over MAIN BR CHICAGO RIV
Structure number:016603500000000
Old structure number:000016603527325 (from 1992 edition)
Location:365 N MCHIGAN AVE
Purpose:Carries highway over waterway
Route classification:Other Principal Arterial (Urban) [14]
Length of largest span:255.9 ft. [78.0 m]
Total length:399.0 ft. [121.6 m]
Roadway width between curbs:64.0 ft. [19.5 m]
Deck width edge-to-edge:91.9 ft. [28.0 m]
Vertical clearance above deck:13.5 ft. [4.1 m]
Vertical clearance below bridge:16.1 ft. [4.9 m]
Owner:City or Municipal Highway Agency [04]
Year built:1920
Historic significance:Bridge is on the National Register of Historic Places [1]
Design load:MS 18 / HS 20 [5]
Main span material:Steel [3]
Main span design:Movable - Bascule [16]
Deck type:Closed Grating [4]
Wearing surface:Other [9]

Latest Available Inspection: September 2015 

Status:Open, no restriction [A]
Average daily traffic:39,700 [as of 2014]
Truck traffic:5% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Poor [4 out of 9]
Substructure condition:Satisfactory [6 out of 9]
Structural appraisal:Meets minimum tolerable limits to be left in place as is [4]
Deck geometry appraisal:Basically intolerable requiring high priority of replacement [2]
Water adequacy appraisal:Superior to present desirable criteria [9]
Roadway alignment appraisal:Equal to present desirable criteria [8]
Channel protection:There are no noticeable or noteworthy deficiencies which affect the condition of the channel. [9]
Pier/abutment protection:In place but in a deteriorated condition [3]
Scour condition:Bridge foundations determined to be stable for the assessed or calculated scour condition. [8]
Operating rating:48.5 tons [44.1 metric tons]
Inventory rating:35.6 tons [32.4 metric tons]
Evaluation:Structurally deficient [1]
Sufficiency rating:43.5
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$3,618,000

Previous Inspections 

DateSuff. ratingEvaluationDeckSuper.Sub.ADT
September 201543.5Structurally deficientSatisfactoryPoorSatisfactory39700
October 201357.0Functionally obsoleteSatisfactoryFairSatisfactory39700
October 201160.2Functionally obsoleteSatisfactoryFairSatisfactory37900
October 200971.6Functionally obsoleteSatisfactorySatisfactorySatisfactory37900
October 200771.9Functionally obsoleteSatisfactorySatisfactorySatisfactory33300
November 200571.9Functionally obsoleteSatisfactorySatisfactorySatisfactory33300
October 200371.3Functionally obsoleteSatisfactorySatisfactorySatisfactory43700
November 200171.9Functionally obsoleteSatisfactorySatisfactorySatisfactory33909
August 199971.9Functionally obsoleteSatisfactorySatisfactorySatisfactory33900
August 199771.9Functionally obsoleteSatisfactorySatisfactorySatisfactory33900
September 199570.6Functionally obsoleteGoodVery GoodSatisfactory33900
March 199470.6Functionally obsoleteExcellentVery GoodVery Good33900
January 199215.6Structurally deficientSeriousPoorSerious33900
January 199015.6Structurally deficientSeriousPoorSerious33900