Bridge conditions in Pottawattamie County, Iowa
557 inventoried bridges · 50 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Pottawattamie County tracks close to typical: 50 of its 557 inventoried bridges (9.0%) are rated poor, against a national rate of about 7%.
- 50 of the 557 bridges in Pottawattamie County, Iowa, are rated in poor condition (9.0%) in the 2025 National Bridge Inventory, as of .
- 219 bridges (39.3%) are rated good and 288 (51.7%) fair.
- The median Pottawattamie County bridge was built in 1980.
- The busiest poor-rated bridge is South Expressway over Viaduct(rr & Streets) (built 1976), carrying about 7,488 vehicles a day.
Good 39.3% · Fair 51.7% · Poor 9.0% of 557 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| South Expressway over Viaduct(rr & Streets) | 1976 | 7,488 | Poor |
| 9TH Ave over Indian Creek | 1930 | 4,059 | Poor |
| 5TH Ave over Indian Creek | 1935 | 3,013 | Poor |
| Fm-magnolia Rd over Mosquito Creek | 1965 | 2,949 | Poor |
| Creek Top Rd over Indian Creek | 1937 | 2,027 | Poor |
| North 13TH Street over Indian Creek | 1937 | 2,027 | Poor |
| FM over Pony Creek | 1966 | 1,733 | Poor |
| Railroad Hwy over Stream | 1952 | 1,676 | Poor |
| Tamarack Road over over BNSF RR | 1930 | 1,325 | Poor |
| Ia 92 over Indian Creek | 1938 | 1,180 | Poor |
| 1ST Street over Indian Creek | 1936 | 684 | Poor |
| FM over Drainage | 1964 | 270 | Poor |
| 7TH Ave over Indian Creek | 1930 | 235 | Poor |
| L19 over I-29 | 1958 | 229 | Poor |
| 3RD Ave over Indian Creek | 1935 | 179 | Poor |
| Broadway to RR over Indian Creek | 1937 | 126 | Poor |
| Fm-310th Street over Iais RR | 1952 | 110 | Poor |
| FM over E Nishnabotna River | 1958 | 60 | Poor |
| 310TH Street over Stream | 1994 | 60 | Poor |
| Teakwood Road over Neola Creek | 1978 | 60 | Poor |
| Sumac Rd over Stream | 1949 | 45 | Poor |
| 210TH Street over Pigeon Creek | 1952 | 40 | Poor |
| Fm-145th Street over Drainage | 1959 | 40 | Poor |
| Local over Graybill Creek | 1950 | 29 | Poor |
| Elmtree Road over Silver Creek | 1961 | 29 | Poor |
| Dogwood Road over Silver Creek | 1930 | 29 | Poor |
| Local over Graybill Creek | 1951 | 26 | Poor |
| 470TH Street over Jordan Creek | 1967 | 26 | Poor |
| Missouri Avenue over Walnut Creek | 1953 | 26 | Poor |
| 430TH Street over Stream | 1940 | 26 | Poor |
| FM over Mud Creek | 1976 | 20 | Poor |
| Road L-34 over Stream | 1965 | 20 | Poor |
| Rosewood Road over Keg Creek | 1976 | 20 | Poor |
| 320TH Street over Stream | 1976 | 20 | Poor |
| Lombardy Road over Little Silver Creek | 1989 | 20 | Poor |
| 432ND Street over Jordan Creek | 1968 | 15 | Poor |
| Rosewood Road over Second Creek | 1949 | 15 | Poor |
| Local over Drainage | 1995 | 11 | Poor |
| 250TH Street over Stream | 1940 | 11 | Poor |
| Idelwood Road over Walnut Creek | 1977 | 11 | Poor |
| 390TH Street over Iais RR | 1952 | 11 | Poor |
| Inca Lane over Pigeon Creek | 1924 | 11 | Poor |
| Sumac Road over Stream | 1992 | 11 | Poor |
| Magnolia Road over Stream | 1982 | 11 | Poor |
| Hemlock Ave over Graybill Creek | 1947 | 5 | Poor |
| Edison Lane over Jordan Creek | 1976 | 5 | Poor |
| Magnolia Road over Stream | 1961 | 5 | Poor |
| 515TH Street over Stream | 1991 | 5 | Poor |
| 220TH Street over Pigeon Creek | 1925 | 5 | Poor |
| 510TH Street over Stream | 1992 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-480 & US 6 over Missouri River & RR | 1966 | 53,700 | Fair |
| I-80 EB over Missouri River Rd & RR | 1972 | 31,550 | Fair |
| I 80 & US 6 over Little Mosquito Creek | 1966 | 31,100 | Fair |
| I 80 WB over Missouri Rvr Rd RR | 2010 | 25,250 | Good |
| I 29 SB over I-80 & I-29 Interchange | 2014 | 23,900 | Good |
| I-80 over Bedell Creek | 1965 | 23,800 | Fair |
| I-80 over Stream | 1965 | 23,600 | Fair |
| I 80 over Drainage Ditch | 1966 | 23,000 | Fair |
| I-80 over Stream | 1965 | 22,600 | Fair |
| I 29 over Drainage Ditch | 2022 | 20,600 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Iowa: Iowa bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.