+42.48889, -91.27500
42°29'20" N, 91°16'30" W


Source: National Bridge Inventory. Information not verified; use at your own risk.
Name:US 30 over ROCK CREEK
Structure number:000000000018261
Location:0.6 mi W of W Jct. Ia 38
Purpose:Carries highway over waterway
Route classification:Principal Arterial - Other (Rural) [02]
Length of largest span:39.0 ft. [11.9 m]
Total length:103.0 ft. [31.4 m]
Roadway width between curbs:44.3 ft. [13.5 m]
Deck width edge-to-edge:47.6 ft. [14.5 m]
Owner:State Highway Agency [01]
Year built:1973
Historic significance:Bridge is not eligible for the National Register of Historic Places [5]
Design load:MS 18 / HS 20 [5]
Number of main spans:3
Main spans material:Concrete continuous [2]
Main spans design:Slab [01]
Deck type:Concrete Cast-in-Place [1]
Wearing surface:Low slump Concrete [4]

Latest Available Inspection: June 2015

Good/Fair/Poor Condition:Fair
Status:Open, no restriction [A]
Average daily traffic:4,350 [as of 2014]
Truck traffic:17% of total traffic
Deck condition:Satisfactory [6 out of 9]
Superstructure condition:Satisfactory [6 out of 9]
Substructure condition:Good [7 out of 9]
Structural appraisal:Equal to present minimum criteria [6]
Deck geometry appraisal:Superior to present desirable criteria [9]
Water adequacy appraisal:Equal to present minimum criteria [6]
Roadway alignment appraisal:Better than present minimum criteria [7]
Channel protection:Bank is beginning to slump. River control devices and embankment protection have widespread minor damage. There is minor stream bed movement evident. Debris is restricting the channel slightly. [6]
Scour condition:Bridge foundations determined to be stable for assessed or calculated scour condition. [5]
Operating rating:59.3 tons [53.9 metric tons]
Inventory rating:31.7 tons [28.8 metric tons]
Sufficiency rating:87.3

Previous Inspections

DateSuff. RatingConditionDeckSuperstructureSubstructureSD/FOADT
June 201587.3FairSatisfactorySatisfactoryGood-4350
June 201388.7FairSatisfactorySatisfactoryGood-3700
June 201189.8FairSatisfactorySatisfactoryGood-3650
June 200989.1FairSatisfactorySatisfactoryGood-3860
June 200789.3FairSatisfactoryGoodGood-3910
November 200587.6FairSatisfactoryGoodGood-4680
October 200388.0GoodGoodGoodGood-4510
December 200187.6GoodGoodGoodGood-4690
July 199987.8GoodGoodGoodGood-4610
September 199784.7FairFairSatisfactoryGood-4570
October 199586.3FairGoodSatisfactoryGood-3930
August 199386.7FairSatisfactorySatisfactoryGood-3710
August 199186.3FairSatisfactorySatisfactoryGood-3580

Element Data

Source: National Bridge Elements dataset, 2016 edition. This feature is experimental.
ElementUnitsQuantity1. Good2. Fair3. Poor4. Serious
Reinforced Concrete Abutmentlinear ft.9589600
Prestressed Concrete Pileeach2020000
Reinforced Concrete Pier Caplinear ft.94751900
Pourable Jointlinear ft.88187000
Bridge Rail
Reinforced Concrete Bridge Raillinear ft.206206000
Reinforced Concrete Slabsq. ft.4,8764,65222400
Wearing Surfacessq. ft.4,5324,21431800