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Bridge conditions in Mountrail County, North Dakota

28 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory

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

Mountrail County tracks close to typical: 1 of its 28 inventoried bridges (3.6%) are rated poor, against a national rate of about 7%.

1 of the 28 bridges in Mountrail County, North Dakota, are rated in poor condition (3.6%) in the 2025 National Bridge Inventory, as of August 20, 2026.
15 bridges (53.6%) are rated good and 12 (42.9%) fair.
The median Mountrail County bridge was built in 1991.
The busiest poor-rated bridge is County Highway over Cottonwood Lake (built 1946), carrying about 20 vehicles a day.

Good 53.6% · Fair 42.9% · Poor 3.6% of 28 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
County Highway over Cottonwood Lake	1946	20	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Irrfb Nd Hiway 23 over Crane Creek	2012	7,340	Good
Irrfb Nd Hiway 23 over Creek	1995	5,510	Good
Irrfb Nd Hiway 23 over Shell Creek	2012	4,885	Good
Irrfb Nd Hwy 23 over Creek	2013	3,165	Good
Irrfb Nd Hiway 23 over Creek	1993	2,600	Good
Nd Highway 8 over Little Knife River	1985	2,110	Good
Irrfb Nd Hiway 23 over Creek	1953	1,920	Fair
US Highway 2 over White Earth River	2005	1,575	Fair
US Highway 2 over White Earth River	1980	1,480	Fair
Irrfb Nd Hiway 37 over East Branch Shell Creek	1979	700	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.