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Bridge conditions in Sac County, Iowa

221 inventoried bridges · 65 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

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 August 20, 2026.
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.

Every bridge in Sac County → - all 221, busiest first, each with its own condition record.

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.