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305TH RD over TRIB N BLACKBIRD C

Map

Coordinates:
+40.56562, -92.98718
40°33'56" N, 92°59'14" W

Facts

Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:305TH RD over TRIB N BLACKBIRD C
Structure number:16795
Old structure number:1320014 086 (from 1992 edition)
Location:S 36 T 67 N R 19 W
Purpose:Carries highway over waterway
Route classification:Local (Rural) [09]
Length of largest span:40.0 ft. [12.2 m]
Total length:40.0 ft. [12.2 m]
Roadway width between curbs:13.5 ft. [4.1 m]
Deck width edge-to-edge:13.5 ft. [4.1 m]
Owner:County Highway Agency [02]
Year built:1915
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Main span material:Steel [3]
Main span design:Truss - Thru [10]
Deck type:Wood or Timber [8]

Latest Available Inspection: February 2017

Good/Fair/Poor Condition:Poor
Status:Posted for load [P]
Average daily traffic:5 [as of 2017]
Truck traffic:10% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Fair [5 out of 9]
Substructure condition:Poor [4 out of 9]
Structural appraisal:Basically intolerable requiring high priority of replacement [2]
Deck geometry appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Water adequacy appraisal:Better than present minimum criteria [7]
Roadway alignment appraisal:Equal to present desirable criteria [8]
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:24.0
Recommended work:Replacement of bridge or other structure because of substandard load carrying capacity or substantial bridge roadway geometry. [31]
Estimated cost of work:$206,000

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
February 2017PoorFairFairPoor524.0
February 2015PoorFairFairPoor524.0
February 2013PoorFairFairPoor524.0
February 2011FairFairFairFair524.0
November 2008FairFairFairFair524.0
January 2007FairFairFairFair524.0
March 2005FairFairFairFair524.0
March 2003FairFairFairSatisfactory524.0
January 2001FairSatisfactorySatisfactorySatisfactory525.0
February 1999FairSatisfactorySatisfactoryFair525.0
January 1991PoorPoorFairSatisfactory522.0