Bridge conditions in Linn County, Iowa
511 inventoried bridges · 34 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Linn County tracks close to typical: 34 of its 511 inventoried bridges (6.7%) are rated poor, against a national rate of about 7%.
- 34 of the 511 bridges in Linn County, Iowa, are rated in poor condition (6.7%) in the 2025 National Bridge Inventory, as of .
- 182 bridges (35.6%) are rated good and 295 (57.7%) fair.
- The median Linn County bridge was built in 1990.
- The busiest poor-rated bridge is 8TH Ave over Indian Creek (built 1988), carrying about 10,789 vehicles a day.
Good 35.6% · Fair 57.7% · Poor 6.7% of 511 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 |
|---|---|---|---|
| 8TH Ave over Indian Creek | 1988 | 10,789 | Poor |
| Edgewood Rd NE over Cedar River & RR | 1969 | 10,268 | Poor |
| Center Point Rd over over Cc RR | 1968 | 9,703 | Poor |
| 8TH Ave over Cedar River | 1938 | 9,382 | Poor |
| Covington Rd over Silver Creek | 1955 | 5,696 | Poor |
| Covington Rd over Lone Tree Creek | 1925 | 5,200 | Poor |
| C St. over Prairie Creek | 1964 | 4,910 | Poor |
| J St over Prairie Creek | 1964 | 4,121 | Poor |
| E Ave Northwest over Cedar River | 1979 | 3,461 | Poor |
| 16TH Ave EB over over UP RR & Street | 1937 | 3,200 | Poor |
| N Centerpoint over East Blue Creek | 1930 | 2,583 | Poor |
| F Ave Northwest over Cedar River | 1979 | 2,193 | Poor |
| Troy Mills Rd over Wapsipinicon River | 1951 | 2,033 | Poor |
| Northbrook Dr over Dry Creek | 1972 | 1,755 | Poor |
| 3RD Ave SE (EB) over Cedar River | 1912 | 1,610 | Poor |
| 18TH St SW over Drainage Ditch | 1978 | 1,494 | Poor |
| Winslow Rd over Indian Creek | 2002 | 1,129 | Poor |
| Central City Rd over East Otter Creek | 1962 | 982 | Poor |
| FM E-66 over Oscar Creek | 1917 | 640 | Poor |
| Alburnett Rd over River Bend Creek | 1963 | 462 | Poor |
| Worchester Rd over Morgan Creek | 2000 | 439 | Poor |
| Rosedale Rd over Indian CR | 1890 | 299 | Poor |
| 5TH Ave over Little Big Creek | 1915 | 232 | Poor |
| Matsell Pk Rd over Wapsipinicon River | 1939 | 147 | Poor |
| Cedar Ridge Rd. over Blue Creek | 1989 | 147 | Poor |
| Sutton Rd over Wapsipinicon River | 1879 | 140 | Poor |
| Big Creek Rd. over Big Creek | 1929 | 130 | Poor |
| Martin Cr.rd. over Martins CR | 1972 | 120 | Poor |
| Old Br.rd. over Prairie Creek | 1906 | 110 | Poor |
| Hills Mill Rd over Buffalo Creek | 1940 | 88 | Poor |
| Burlingham Rd over Buffalo CR | 1900 | 50 | Poor |
| Morgan Br Rd over Morgan Creek | 1987 | 34 | Poor |
| Red Bridge Rd over Buffalo CR | 1900 | 15 | Poor |
| Hickoryvalleyrd over West Otter Creek | 1987 | 11 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-380 over E and F Ave NW Cedar Rvr | 1979 | 57,600 | Fair |
| SB I-380 over Cc RR & Ash Pit | 1979 | 41,000 | Fair |
| NB I-380 over Cc RR | 1980 | 38,800 | Fair |
| SB I-380 over Cc RR | 1980 | 38,800 | Fair |
| NB I-380 over H Ave NE | 1980 | 38,800 | Fair |
| SB I-380 over H Ave NE | 1980 | 38,800 | Good |
| NB I 380 over J Ave NE | 1980 | 38,800 | Fair |
| SB I-380 over J Ave NE | 1980 | 38,800 | Fair |
| NB I-380 over Coldstream Ave NE | 1980 | 35,400 | Fair |
| SB I-380 over Coldstream Ave NE | 1980 | 35,400 | Fair |
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.