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Nd Highway 8 over Thirty Mile Creek

Hettinger County, North Dakota · rated Fair in the 2025 National Bridge Inventory

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

Nd Highway 8 over Thirty Mile Creek in Hettinger County, North Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1962, making it 63 years old at the 2025 inventory.
It carries about 450 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 34 of the 64 inventoried bridges in Hettinger County rated fair (53.1%); 9 (14.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous concrete tee beam
Length	about 100 ft
Location	10 North of Mott
NBI structure number	0008055283
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Nd Highway 22 over Creek	1960	1,100	Fair
Nd Highway 22 over Cannonball River	1960	830	Fair
W 1st St over N Fork Cannonball River	1982	700	Fair
Nd Highway 8 over Cannonball River	1979	670	Good
Nd Highway 22 over Chanta Peta Creek	1985	600	Fair
12th St over Creek	1958	550	Fair