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US 18 over Niobrara River

Niobrara County, Wyoming · rated Fair in the 2025 National Bridge Inventory

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

US 18 over Niobrara River in Niobrara County, Wyoming, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1988, making it 37 years old at the 2025 inventory.
It carries about 2,942 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 21 of the 34 inventoried bridges in Niobrara County rated fair (61.8%); 1 (2.9%) 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	Steel stringer or multi-beam girder
Length	about 108 ft
Location	Lusk
NBI structure number	FDE
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 85 over UPRR	2016	2,942	Good
US 18 over Stockpass	1970	2,406	Good
US 18 over Old Woman Creek	1971	2,150	Fair
US 18 over Old Woman Creek	1987	2,150	Fair
US 18 over Mule Creek	1988	2,150	Fair
US 85 over Cheyenne River	1990	1,084	Fair