Bridge conditions in Sac County, Iowa
221 inventoried bridges · 65 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Sac County has 65 bridges rated poor out of 221 inventoried, a 29.4% share that puts it well above the national rate of about 7%.
- 65 of the 221 bridges in Sac County, Iowa, are rated in poor condition (29.4%) in the 2025 National Bridge Inventory, as of .
- 85 bridges (38.5%) are rated good and 71 (32.1%) fair.
- The median Sac County bridge was built in 1980.
- The busiest poor-rated bridge is Needham Ave over Small Natural Stream (built 1939), carrying about 1,117 vehicles a day.
Good 38.5% · Fair 32.1% · Poor 29.4% of 221 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 |
|---|---|---|---|
| Needham Ave over Small Natural Stream | 1939 | 1,117 | Poor |
| FM over Indian Creek | 1969 | 938 | Poor |
| 255TH St over Little Indian Creek | 1968 | 928 | Poor |
| FM over Boyer River | 1956 | 848 | Poor |
| High St over Drainage | 1968 | 479 | Poor |
| FM over Raccoon River | 1965 | 290 | Poor |
| D15 190TH St over Boyer River | 1964 | 280 | Poor |
| FM over No Name Creek | 1925 | 249 | Poor |
| FM over Overflow on Boyer River | 1964 | 249 | Poor |
| Willow St over Drainage | 1900 | 232 | Poor |
| FM over No Name Creek | 1969 | 170 | Poor |
| FM over Racoon River | 1920 | 120 | Poor |
| FM over Raccoon River | 1974 | 110 | Poor |
| FM over Small Stream | 1977 | 110 | Poor |
| Local over Stream | 1957 | 100 | Poor |
| FM over Odebolt Creek | 1951 | 71 | Poor |
| FM over Racoon River | 1924 | 71 | Poor |
| FM over Unnamed Creek | 1955 | 60 | Poor |
| FM over Boyer River | 1958 | 60 | Poor |
| Local over Boyer River | 1916 | 60 | Poor |
| FM over Stream | 1924 | 50 | Poor |
| Local over Halfway Creek | 1918 | 50 | Poor |
| FM over No Name Creek | 1954 | 45 | Poor |
| Local over No Name Creek | 1964 | 45 | Poor |
| Local Rd over Otter Creek | 1968 | 45 | Poor |
| FM over Raccoon River | 1921 | 45 | Poor |
| Local over Small Stream | 1914 | 45 | Poor |
| Local over DD#16 | 1924 | 45 | Poor |
| Local over Stream | 1961 | 45 | Poor |
| Local over No Name Creek | 1926 | 34 | Poor |
| Local over Stream | 1934 | 34 | Poor |
| Local over Small Creek | 1925 | 34 | Poor |
| Local over Boyer Valley | 1925 | 34 | Poor |
| FM over Cedar Creek D D #181 | 1966 | 34 | Poor |
| Local over Stream | 1917 | 30 | Poor |
| Local over Small Stream | 1985 | 30 | Poor |
| Local Road over Small Stream | 1923 | 30 | Poor |
| Local Road over Small Stream | 1932 | 30 | Poor |
| Local Road over Drainage | 1964 | 30 | Poor |
| Local Rd over Small | 1977 | 30 | Poor |
| Local over Stream | 1981 | 30 | Poor |
| FM over Small Stream | 1945 | 26 | Poor |
| Local over Small Stream | 1971 | 26 | Poor |
| Local over Small Stream | 1986 | 26 | Poor |
| Local over Stream | 1924 | 26 | Poor |
| FM over D D #71 | 1930 | 26 | Poor |
| Local over Stream | 1953 | 26 | Poor |
| Local over Raccoon River | 1930 | 26 | Poor |
| FM over Stream | 1981 | 26 | Poor |
| FM over Small Stream | 1974 | 20 | Poor |
| FM over Dd #71 | 1920 | 20 | Poor |
| Local over Small Stream | 1949 | 20 | Poor |
| Local over Stream | 1956 | 20 | Poor |
| Local over Small Stream | 1931 | 20 | Poor |
| Local over Small Stream | 1974 | 15 | Poor |
| Local over Boyer River | 1931 | 15 | Poor |
| Local over Odebolt Creek | 1981 | 15 | Poor |
| Local over Small Stream | 1923 | 15 | Poor |
| Local over Small Stream | 1980 | 15 | Poor |
| Local over Stream | 1960 | 15 | Poor |
| Local over Stream | 1958 | 11 | Poor |
| Local over Small Stream | 1924 | 11 | Poor |
| Local over Stream | 1932 | 11 | Poor |
| Local over Small Stream | 1953 | 11 | Poor |
| Local over Small Stream | 1916 | 11 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Unnamed Stream | 2017 | 4,850 | Good |
| E Main St over Raccoon River | 2004 | 3,853 | Good |
| US 20 EB US 71 SB over North Raccoon River | 2012 | 3,300 | Good |
| US 20 WB US 71 NB over North Raccoon River | 2012 | 3,300 | Good |
| US 20 EB over Cedar Creek | 2012 | 2,950 | Good |
| US 20 WB over Cedar Creek | 2012 | 2,950 | Good |
| Ia 175 over High St | 1934 | 2,540 | Fair |
| US 20 EB over US 71 NB | 2012 | 2,440 | Good |
| US 20 WB over US 71 NB | 2012 | 2,440 | Good |
| US 20 EB over Boyer River | 2018 | 2,425 | 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.