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Wyo 173 over Big Horn River

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

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

Wyo 173 over Big Horn River in Hot Springs 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 1992, making it 33 years old at the 2025 inventory.
It carries about 314 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 29 of the 39 inventoried bridges in Hot Springs County rated fair (74.4%); 3 (7.7%) 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 291 ft
Location	4 Mi S. Of Thermopolis
NBI structure number	JOE
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 20 over Unnamed Draw	1977	5,840	Good
US 20 over Red Lane Draw	1976	2,747	Fair
US 20 over Big Horn River	1957	2,711	Fair
US 20 over BNSF Railway	1959	2,711	Fair
US 20 over Owl Creek	1937	1,934	Fair
US 20 over Unnamed Draw	1956	1,934	Fair