Bridge conditions in Montgomery County, Iowa
209 inventoried bridges · 52 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Montgomery County has 52 bridges rated poor out of 209 inventoried, a 24.9% share that puts it well above the national rate of about 7%.
- 52 of the 209 bridges in Montgomery County, Iowa, are rated in poor condition (24.9%) in the 2025 National Bridge Inventory, as of .
- 44 bridges (21.1%) are rated good and 113 (54.1%) fair.
- The median Montgomery County bridge was built in 1969.
- The busiest poor-rated bridge is Old US 71 over BNSF RR (built 1929), carrying about 1,187 vehicles a day.
Good 21.1% · Fair 54.1% · Poor 24.9% of 209 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 |
|---|---|---|---|
| Old US 71 over BNSF RR | 1929 | 1,187 | Poor |
| 4TH St over Red Oak Creek | 1965 | 861 | Poor |
| FM over Walnut Creek | 1967 | 750 | Poor |
| FM over Walnut Creek | 1956 | 528 | Poor |
| Third St over Middle Nodaway | 1939 | 415 | Poor |
| FM over W Nodaway | 1939 | 300 | Poor |
| FM over Indian Creek | 1957 | 270 | Poor |
| FM over Tarkio Creek | 1955 | 219 | Poor |
| FM over Tarkio Creek Trib | 1959 | 219 | Poor |
| FM over Little Tarkio | 1958 | 219 | Poor |
| FM over Crabapple Creek | 1958 | 199 | Poor |
| FM over Nishnabotna Trib | 1957 | 173 | Poor |
| FM over Tarkio Creek | 1949 | 159 | Poor |
| FM over Walnut Creek Trib | 1965 | 153 | Poor |
| Local Road over Local Creek | 1963 | 112 | Poor |
| Local Rd over M Nodaway River | 1952 | 100 | Poor |
| FM over Little Tarkio Trib | 1964 | 89 | Poor |
| Local over over BNSF RR | 1977 | 61 | Poor |
| Local Road over Minor Drainage | 1930 | 61 | Poor |
| FM over Little Tarkio Trib | 1947 | 60 | Poor |
| Local over Tarkio Creek | 1949 | 60 | Poor |
| FM over Nishnabotna | 1942 | 60 | Poor |
| Local over West Nodaway River | 1924 | 58 | Poor |
| Local Rd over West Nodaway River | 1940 | 45 | Poor |
| FM over Little Tarkio Trib | 1947 | 29 | Poor |
| FM over Nishnabotna Trib | 1949 | 29 | Poor |
| Local Rd over W Nodaway River | 1970 | 26 | Poor |
| Local over Drainage | 1945 | 20 | Poor |
| Local Road over Local Stream | 1985 | 20 | Poor |
| Local Road over Walnut Creek | 1951 | 20 | Poor |
| Local over Nodaway River | 1968 | 20 | Poor |
| Local over Drainage | 1942 | 20 | Poor |
| Local Road over Minor Drainage | 1971 | 20 | Poor |
| Redwood Ave over BNSF RR | 1913 | 15 | Poor |
| Local over Drainage | 1952 | 15 | Poor |
| Local over Tarkio Creek Trib | 1956 | 15 | Poor |
| Local Road over Walnut Creek | 1930 | 15 | Poor |
| Local Rd over Branch Tarkio Creek | 1959 | 15 | Poor |
| Local Rd over Tarkio Creek | 1966 | 11 | Poor |
| Local over Walnut Creek | 1966 | 11 | Poor |
| County Road over Br Tarkio Creek | 1956 | 11 | Poor |
| Local over Drainage | 1966 | 11 | Poor |
| Local Rd over Little Tarkio Creek | 1950 | 11 | Poor |
| Local-cass#104b over Tarkio Creek | 1990 | 11 | Poor |
| Local over Br Walnut Creek | 1988 | 11 | Poor |
| Local over Trib Tarkio | 1955 | 5 | Poor |
| Local over Small Stream | 1985 | 5 | Poor |
| Local over Drainage | 1987 | 5 | Poor |
| Local over Drainage | 1969 | 5 | Poor |
| Local over Nishnabotna Trib | 1970 | 5 | Poor |
| Local over Drainage | 1945 | 5 | Poor |
| Local over Minor Drainage | 1966 | 5 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 48 over Stream | 1931 | 7,600 | Fair |
| US 34 over East Nishnabotna River | 1964 | 4,460 | Fair |
| Ia 48 over Red Oak Creek | 1918 | 4,460 | Fair |
| US 34 over Indian Creek | 1964 | 4,030 | Fair |
| US 34 over Crabapple Creek | 1964 | 4,030 | Fair |
| US 34 over West Tarkio Creek | 1964 | 3,990 | Fair |
| US 34 over Tarkio River | 1964 | 3,990 | Fair |
| US 34 over Walnut Creek | 1964 | 3,730 | Good |
| US 34 over Little Tarkio Creek | 1964 | 2,880 | Fair |
| US 34 over Middle Nodaway River | 1964 | 2,240 | 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.