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S 484 Fh 51 over Otter Creek

Powder River County, Montana · rated Fair in the 2025 National Bridge Inventory

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

S 484 Fh 51 over Otter Creek in Powder River County, Montana, 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 1963, making it 62 years old at the 2025 inventory.
It carries about 85 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 11 of the 23 inventoried bridges in Powder River County rated fair (47.8%); 0 (0.0%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 102 ft
Location	7M SE Ashland
NBI structure number	S00484003+04001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 212 over Little Powder River	1976	2,594	Fair
US 212 over E Fk Little Powder River	1983	2,594	Fair
US 212 over E Fork Otter Creek	1992	2,305	Good
US 212 over Pumpkin Creek	2012	2,197	Good
US 212 over Powder River	1985	2,084	Good
S 59 over Mizpah Creek	2001	742	Good