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M-20 over N BR CHIPPEWA RIVER

Map

Coordinates:
+43.59704, -84.85496
43°35'49" N, 84°51'18" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:M-20 over N BR CHIPPEWA RIVER
Structure number:000000000004264
Old structure number:37137021000B020 (from 1992 edition)
Location:4.5 MI W OF US-27BR
Purpose:Carries highway over waterway
Route classification:Minor Arterial (Rural) [06]
Length of largest span:49.9 ft. [15.2 m]
Total length:49.9 ft. [15.2 m]
Roadway width between curbs:41.0 ft. [12.5 m]
Deck width edge-to-edge:43.3 ft. [13.2 m]
Owner:State Highway Agency [01]
Year built:1934
Year reconstructed:1964
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Main span material:Steel [3]
Main span design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Latex Concrete or similar additive [3]

Latest Available Inspection: March 2017

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:8,359 [as of 2007]
Truck traffic:4% of total traffic
Deck condition:Satisfactory [6 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:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Equal to present desirable criteria [8]
Roadway alignment appraisal:Better than present minimum criteria [7]
Channel protection:Bank and embankment protection is severely undermined. River control devices have severe damage. Large deposits of debris are in the channel. [4]
Scour condition:Bridge is scour critical; bridge foundations determined to be unstable. [3]
Sufficiency rating:97.0

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
March 2017FairSatisfactoryGoodGood835997.0
March 2015FairSatisfactoryGoodGood835997.0
March 2013FairSatisfactoryGoodGood835997.0
March 2011FairSatisfactoryGoodGood835997.0
March 2009FairSatisfactoryGoodGood835997.0
March 2008FairSatisfactoryGoodGood852797.0
March 2006FairSatisfactoryGoodGood852797.0
March 2004FairSatisfactoryGoodSatisfactory1300093.9
April 2003FairGoodGoodSatisfactory1300093.9
April 2001FairGoodGoodSatisfactory1300093.9
August 1999FairGoodGoodSatisfactory1300093.9
June 1997FairGoodGoodSatisfactory1300091.9
October 1995FairFairGoodSatisfactory820094.1
July 1993FairSatisfactoryVery GoodSatisfactory820095.1
March 1991FairGoodVery GoodSatisfactory820095.1