Bridge conditions in Iron County, Missouri
126 inventoried bridges · 13 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
About one in 10 bridges in Iron County is rated in poor condition: 13 of 126 on the federal inventory, one of the higher shares in Missouri.
- 13 of the 126 bridges in Iron County, Missouri, are rated in poor condition (10.3%) in the 2025 National Bridge Inventory, as of .
- 37 bridges (29.4%) are rated good and 76 (60.3%) fair.
- The median Iron County bridge was built in 1965.
- The busiest poor-rated bridge is Mo 49 S over Br (built 1924), carrying about 973 vehicles a day.
Good 29.4% · Fair 60.3% · Poor 10.3% of 126 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 |
|---|---|---|---|
| Mo 49 S over Br | 1924 | 973 | Poor |
| Mo 49 S over UP RR | 1927 | 973 | Poor |
| Rt E E over Marble CR | 1936 | 931 | Poor |
| Mo 32 E over Richardson CR | 1922 | 860 | Poor |
| Thompson Rd over Creek | 1930 | 800 | Poor |
| Rt U E over Br E Fk Cedar CR | 1922 | 375 | Poor |
| N Main St over Knob CR | 1972 | 200 | Poor |
| Banner Rd over Reid CR | 1950 | 100 | Poor |
| County Rd 020 over Cedar CR | 1950 | 100 | Poor |
| Adam Creek Rd over Abbott CR | 1998 | 50 | Poor |
| St Marys Rd over Br of Stouts CR | 1980 | 35 | Poor |
| Adams Hollow -154 over Creek | 1930 | 35 | Poor |
| Service Road over Council Bluff Lake | 1978 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mo 21 S over Knob CR | 1967 | 6,248 | Fair |
| Old Rte 21 over Stouts CR | 1926 | 4,000 | Fair |
| Mo 21 S over Stouts CR | 1967 | 3,870 | Fair |
| Rt N N over UP RR | 2007 | 3,718 | Good |
| Rt N N over Indian CR | 1932 | 3,718 | Fair |
| Mo 21 S over Claybaugh CR | 1985 | 3,513 | Good |
| Mo 21 S over Palmar CR | 1985 | 3,513 | Fair |
| Mo 21 S over Minor CR | 1985 | 3,513 | Good |
| Mo 72 E over Mo 21 UP RR CR | 1930 | 2,672 | Fair |
| Mo 32 E over Crooked CR | 1932 | 2,578 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Missouri: Missouri 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.