FM L-31 over I-29


+40.72294, -95.81279
40°43'23" N, 95°48'46" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:FM L-31 over I-29
Structure number:000000000600130
Location:2.9 MI. N OF JCT. IA 2
Purpose:Carries highway over highway
Route classification:Major Collector (Rural) [07]
Length of largest span:111.9 ft. [34.1 m]
Total length:351.1 ft. [107.0 m]
Roadway width between curbs:29.9 ft. [9.1 m]
Deck width edge-to-edge:33.5 ft. [10.2 m]
Vertical clearance below bridge:13.1 ft. [4.0 m]
Skew angle:38°
Owner:State Highway Agency [01]
Year built:1972
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:M 18 / H 20 [4]
Number of main spans:4
Main spans material:Steel continuous [4]
Main spans design:Stringer/Multi-beam or girder [02]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Monolithic Concrete (concurrently placed with structural deck) [1]

Latest Available Inspection: June 2016

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:660 [as of 2012]
Truck traffic:27% of total traffic
Deck condition:Fair [5 out of 9]
Superstructure condition:Good [7 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Equal to present minimum criteria [6]
Underclearances appraisal:Somewhat better than minimum adequacy to tolerate being left in place as is [5]
Roadway alignment appraisal:Equal to present minimum criteria [6]
Scour condition:Bridge not over waterway. [N]
Sufficiency rating:94.6

Previous Inspections

DateConditionDeckSuperstructureSubstructureADTSuff. Rating
June 2016FairFairGoodGood66094.6
June 2014FairFairGoodGood66094.6
June 2012FairFairGoodGood66094.8
June 2010FairFairGoodGood69093.5
June 2008FairSatisfactoryGoodGood69094.5
June 2006GoodGoodGoodGood54094.3
June 2004GoodGoodGoodGood54094.3
May 2002GoodGoodGoodGood55089.3
June 2000GoodGoodGoodGood950077.3
October 1998GoodGoodGoodGood60085.2
December 1996GoodGoodGoodGood60036.0
June 1994GoodGoodGoodGood38092.1
August 1992GoodGoodGoodGood38092.1
February 1990GoodGoodGoodGood38092.1

Element Data

Source: National Bridge Elements dataset, 2018 edition. This feature is experimental.
Steel Girder/Beamlinear ft.1,38078559500
Steel Protective Coatingsq. ft.20,74516,8853,86000
Reinforced Concrete Decksq. ft.11,70111,30439700
Wearing Surfacessq. ft.10,41910,419000
Reinforced Concrete Columneach66000
Reinforced Concrete Abutmentlinear ft.8383000
Reinforced Concrete Pier Caplinear ft.120120000
Strip Seal Jointlinear ft.8080000
Movable Bearingeach1601600
Fixed Bearingeach40400
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.70252717500