National Bridge Inventory: Iowa Congressional District 3
- Of the 4,187 bridges in the counties of this district, 988, or 23.6 percent, are classified as structurally deficient. This means one of the key elements is in poor or worse condition.
- This is down from 993 bridges classified as structurally deficient in 2019.
- Repairs are needed on 2,713 bridges in the district, which will cost an estimated $851.5 million.
- This compares to 2,786 bridges that needed work in 2019.
- The state has committed $8.0 million in IIJA bridge formula funds to support 5 projects in the District.
County | Year Built | Daily Crossings | Type of Bridge | Location |
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Polk | 1935 | 17,535 | Urban minor arterial | 2nd Ave over Des Moines River |
Polk | 1936 | 17,535 | Urban minor arterial | 2nd Ave over Birdland Dr |
Polk | 1967 | 14,122 | Urban minor arterial | Sw 9th St over Cherry, RR, Mlk Pkwy |
Polk | 1967 | 6,882 | Urban minor arterial | Sw 8th St over RR, Cherry, Mlk Jr Pkwy |
Pottawattamie | 1967 | 6,050 | Urban Interstate | I 29 NB over 25th St |
Pottawattamie | 1967 | 6,050 | Urban Interstate | I 29 SB over 25th St |
Pottawattamie | 1938 | 5,902 | Urban minor arterial | N Broadway over Indian Creek |
Warren | 1971 | 4,469 | Urban collector | City Street over Middle S Creek |
Polk | 1965 | 4,101 | Urban minor arterial | Vandalia Rd over Four Mile Creek |
Pottawattamie | 1930 | 4,063 | Urban minor arterial | 9th Ave over Indian Creek |
Polk | 1911 | 3,848 | Urban collector | Walnut St over Des Moines River |
Pottawattamie | 1935 | 3,016 | Urban minor arterial | 5th Ave over Indian Creek |
Pottawattamie | 1965 | 2,952 | Rural major collector | Fm-Magnolia Rd over Mosquito Creek |
Polk | 1927 | 2,905 | Urban minor arterial | Grant St South over Mud Creek |
Polk | 1936 | 2,828 | Urban minor arterial | Fleur Dr over Raccoon and RR |
Dallas | 1933 | 2,631 | Urban minor arterial | Fm over Johnson Creek |
Dallas | 1933 | 2,631 | Urban minor arterial | Fm over Sugar Creek |
Polk | 1950 | 2,465 | Urban local road | Fm over Deer Creek |
Pottawattamie | 1937 | 2,029 | Urban local road | Creek Top Rd over Indian Creek |
Pottawattamie | 1937 | 2,029 | Urban local road | North 13th Street over Indian Creek |
Dallas | 1966 | 1,930 | Rural major collector | F-60 over Panther Creek |
Warren | 1960 | 1,745 | Rural major collector | Fm over North River |
Madison | 1970 | 1,745 | Rural major collector | Fm over Br Badger Creek |
Pottawattamie | 1952 | 1,678 | Rural major collector | Railroad Hwy over Stream |
Dallas | 1970 | 1,572 | Rural major collector | Fm over Stream |
Type of Bridge | Number of Bridges | Area of All Bridges (sq. meters) |
Daily Crossings on All Bridges | Number of Structurally Deficient Bridges | Area of Structurally Deficient Bridges (sq. meters) |
Daily Crossings on Structurally Deficient Bridges |
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Rural Interstate | 154 | 170,223 | 1,854,720 | 0 | 0 | 0 |
Rural arterial | 132 | 153,204 | 537,590 | 0 | 0 | 0 |
Rural minor arterial | 197 | 138,001 | 394,021 | 3 | 772 | 2,154 |
Rural major collector | 567 | 223,993 | 343,453 | 134 | 42,076 | 62,197 |
Rural minor collector | 625 | 176,417 | 62,758 | 141 | 30,010 | 10,857 |
Rural local road | 1,826 | 320,979 | 72,905 | 673 | 83,345 | 22,826 |
Urban Interstate | 173 | 349,007 | 5,010,660 | 2 | 1,242 | 12,100 |
Urban freeway/expressway | 0 | 0 | 0 | 0 | 0 | 0 |
Urban other principal arterial | 134 | 253,905 | 1,520,881 | 0 | 0 | 0 |
Urban minor arterial | 154 | 207,479 | 979,365 | 12 | 19,881 | 84,151 |
Urban collector | 96 | 66,597 | 219,807 | 4 | 4,513 | 10,608 |
Urban local road | 129 | 45,927 | 109,553 | 19 | 5,910 | 13,004 |
Total | 4,187 | 2,105,733 | 11,105,713 | 988 | 187,750 | 217,897 |
Type of Work | Number of Bridges | Cost to Repair (in millions) |
Daily Crossings | Area of Bridges (sq. meters) |
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Bridge replacement | 1,346 | $341.7 | 208,407 | 226,825 |
Widening & rehabilitation | 13 | $4.3 | 26,606 | 4,177 |
Rehabilitation | 132 | $72.1 | 215,622 | 70,099 |
Deck rehabilitation/replacement | 13 | $4.0 | 1,786 | 3,928 |
Other structural work | 1,209 | $429.4 | 742,105 | 414,840 |
Total | 2,713 | $851.5 | 1,194,526 | 719,869 |
Data includes information for the following area(s): Adair County, Adams County, Cass County, Dallas County, Fremont County, Guthrie County, Madison County, Mills County, Montgomery County, Page County, Polk County, Pottawattamie County, Ringgold County, Taylor County, Union County, Warren County
About the data:
Data and cost estimates are from the Federal Highway Administration (FHWA) National Bridge Inventory (NBI), downloaded on July 3, 2023. Note that specific conditions on bridges may have changed as a result of recent work or updated inspections.
Effective January 1, 2018, FHWA changed the definition of structurally deficient as part of the final rule on highway and bridge performance measures, published May 20, 2017 pursuant to the 2012 federal aid highway bill Moving Ahead for Progress in the 21st Century Act (MAP-21). Two measures that were previously used to classify bridges as structurally deficient are no longer used. This includes bridges where the overall structural evaluation was rated in poor or worse condition, or where the adequacy of waterway openings was insufficient.
The new definition limits the classification to bridges where one of the key structural elements—the deck, superstructure, substructure or culverts, are rated in poor or worse condition. During inspection, the conditions of a variety of bridge elements are rated on a scale of 0 (failed condition) to 9 (excellent condition). A rating of 4 is considered “poor” condition.
Cost estimates have been derived by ARTBA, based on 2022 average bridge replacement costs for structures on and off the National Highway System, published by FHWA. Bridge rehabilitation costs are estimated to be 68 percent of replacement costs. A bridge is considered to need repair if the structure has identified repairs as part of the NBI, a repair cost estimate is supplied by the bridge owner or the bridge is classified as structurally deficient. Please note that for a few states, the number of bridges needing to be repaired can vary significantly from year to year, and reflects the data entered by the state.
Bridges are classified by FHWA into types based on the functional classification of the roadway on the bridge. Interstates comprise routes officially designated by the Secretary of Transportation. Other principal arterials serve major centers of urban areas or provide mobility through rural areas. Freeways and expressways have directional lanes generally separated by a physical barrier, and access/egress points generally limited to on- and off-ramps. Minor arterials serve smaller areas and are used for trips of moderate length. Collectors funnel traffic from local roads to the arterial network; major collectors have higher speed limits and traffic volumes and are longer in length and spaced at greater intervals, while minor collectors are shorter and provide service to smaller communities. Local roads do not carry through traffic and are intended for short distance travel.
2
Compared to 2 in 2022
in the nation in % of structurally deficient bridges
1. West Virginia | 20.0% |
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2. Iowa | 19.0% |
3. South Dakota | 17.0% |
1
Compared to 1 in 2022
in the nation in # of structurally deficient bridges
1. Iowa | 4,558 |
2. Pennsylvania | 3,022 |
7
Compared to 7 in 2022
in the nation in % of structurally deficient bridge deck area
1. Rhode Island | 15.0% |
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7. Iowa | 10.0% |
8. Puerto Rico | 10.0% |
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