Bridge conditions in Bowman County, North Dakota

69 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory

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

Bowman County tracks close to typical: 3 of its 69 inventoried bridges (4.3%) are rated poor, against a national rate of about 7%.

3 of the 69 bridges in Bowman County, North Dakota, are rated in poor condition (4.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
44 bridges (63.8%) are rated good and 22 (31.9%) fair.
The median Bowman County bridge was built in 1987.
The busiest poor-rated bridge is US Highway 85 over Spring Creek (built 1953), carrying about 1,070 vehicles a day.

Good 63.8% · Fair 31.9% · Poor 4.3% of 69 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
US Highway 85 over Spring Creek	1953	1,070	Poor
Hamilton Street over Buffalo Creek	1958	30	Poor
169th Ave. SW over Sevenmile Creek	1970	25	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US Highway 85 over BNSF Railroad Sep	2000	3,250	Good
US Highway 85 over Creek	1966	1,130	Fair
US Highway 85 over Spring Creek	1953	1,070	Poor
US Highway 85 over Creek	1966	1,050	Good
US Highway 85 over Creek	1966	1,050	Fair
US Highway 85 over Creek	1966	1,030	Fair
US Highway 85 over Creek	1966	1,030	Fair
US Highway 85 over North Fork Grand River	1966	1,010	Good
US Highway 12 over Creek	1949	1,000	Good
US Highway 12 over Buffalo Creek	1993	1,000	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of North Dakota: North Dakota 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.