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US Highway 85 over Branch-cannonball River

Slope County, North Dakota · rated Good in the 2025 National Bridge Inventory

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

US Highway 85 over Branch-cannonball River in Slope County, North Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1963, making it 62 years old at the 2025 inventory.
It carries about 1,010 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 36 of the 43 inventoried bridges in Slope County rated good (83.7%); 0 (0.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings

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

Bridge	Built	Vehicles/day	Condition
US Highway 85 over Creek	1991	1,080	Good
US Highway 85 over Philbrick Creek	1937	920	Good
US Highway 12 over Little Missouri River	1950	580	Fair
US Highway 12 over Bnrr Separation	1984	561	Good
US Highway 12 over Little Beaver Creek	1987	520	Good
US Highway 12 over Branch of Beaver Creek	1950	510	Fair