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21ST St SW over Otter Creek

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

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

21ST St SW over Otter Creek in Oliver 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 1960, making it 65 years old at the 2025 inventory.
It carries about 90 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 11 of the 23 inventoried bridges in Oliver County rated fair (47.8%); 1 (4.3%) 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

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

Bridge	Built	Vehicles/day	Condition
Nd Highway 200 over Missouri River	1971	1,430	Fair
Nd Highway 200 over Creek	1970	1,140	Fair
Nd Highway 200 over Creek	1971	940	Poor
Nd Highway over Creek	1976	670	Good
Nd Highway over Square Butte Creek	1987	650	Good
Nd Highway over Br. Square Butte Creek	1948	560	Fair