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Irr Bia Rte 22 over Trib to Red Butte Bay

Mercer County, North Dakota · rated Poor in the 2025 National Bridge Inventory

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

Irr Bia Rte 22 over Trib to Red Butte Bay in Mercer County, North Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 2 (critical condition) on the 0-9 scale.
It was built in 1960, making it 65 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2020).
It is one of 4 of the 71 inventoried bridges in Mercer County rated poor (5.6%); 4 (5.6%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	2	Critical condition

Source: FHWA National Bridge Inventory, 2025 data as reported by the North Dakota department of transportation.

Bridge	Built	Vehicles/day	Condition
Nd Highway 49 over Creek	1967	3,730	Fair
Nd Highway 49 over Knife River	2016	3,400	Good
Nd Highway 49 over Coyote Creek	2016	2,745	Good
Nd Highway 49 over Brush Creek	2016	2,745	Good
Nd Highway 200 over Knife River Overflow	1952	2,300	Fair
Nd Highway 200 over Knife River	1966	2,280	Fair