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Wyo 450 over Black Thunder Creek

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

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

Wyo 450 over Black Thunder Creek in Weston County, Wyoming, 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 1981, making it 44 years old at the 2025 inventory.
It carries about 725 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 28 of the 43 inventoried bridges in Weston County rated fair (65.1%); 5 (11.6%) 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 steel stringer or multi-beam girder
Length	about 138 ft
Location	Newcastle - Jct WYO 59
NBI structure number	DFX
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 16 Bypass over BNSF Railway	1976	5,061	Poor
US 16 over Cambria Creek	1973	3,149	Fair
US 16 Bypass over Cambria Creek	1977	2,941	Fair
US 85 over BNSF Railway	1963	2,045	Fair
US 16 over Whoopup Creek	1959	1,885	Good
US 16 over Skull Creek	1958	1,753	Good