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Irrsr Nd Hiway 31 over Antelope Creek

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

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

Irrsr Nd Hiway 31 over Antelope Creek in Sioux 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 culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 160 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 12 of the 22 inventoried bridges in Sioux County rated good (54.5%); 1 (4.5%) 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

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition

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

Bridge	Built	Vehicles/day	Condition
Irrsr Nd Hiway 24 over Beaver Holes Creek	1965	1,830	Fair
Irrsr Nd Hiway 24 over Porcupine Creek	1963	1,740	Fair
Irrsr Nd Hiway 24 over Battle Creek	1965	1,700	Fair
Irr Bia Rte 3 over Four Mile Creek Bridge	2010	1,000	Good
Irrsr Nd Hiway 24 over Four Mile Creek	1930	750	Fair
Irr Bia Rte 29 over One Mile Creek	1950	401	Poor