FM L-31 over I-29


+40.72359, -95.81268
40°43'25" 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:16.4 ft. [5.0 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]
Operating rating:50.9 tons [46.3 metric tons]
Inventory rating:30.6 tons [27.8 metric tons]
Sufficiency rating:94.6

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
June 201694.6FairFairGoodGood-660
June 201494.6FairFairGoodGood-660
June 201294.8FairFairGoodGood-660
June 201093.5FairFairGoodGood-690
June 200894.5FairSatisfactoryGoodGood-690
June 200694.3GoodGoodGoodGood-540
June 200494.3GoodGoodGoodGood-540
May 200289.3GoodGoodGoodGood-550
June 200077.3GoodGoodGoodGood-9500
October 199885.2GoodGoodGoodGood-600
December 199636.0GoodGoodGoodGoodFO600
June 199492.1GoodGoodGoodGood-380
August 199292.1GoodGoodGoodGood-380
February 199092.1GoodGoodGoodGood-380

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Steel Girder/Beamlinear ft.1,38076561500
Steel Protective Coatingsq. ft.20,74520,44530000
Reinforced Concrete Decksq. ft.11,70111,6297200
Reinforced Concrete Columneach66000
Reinforced Concrete Abutmentlinear ft.83681500
Reinforced Concrete Pier Caplinear ft.120804000
Movable Bearingeach1601600
Fixed Bearingeach40400
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.702702000