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W Lake Rd over Big Muddy Creek 046

Sheridan County, Montana · rated Poor in the 2025 National Bridge Inventory

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

W Lake Rd over Big Muddy Creek 046 in Sheridan County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1950, making it 75 years old at the 2025 inventory.
It carries about 79 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 3 of the 66 inventoried bridges in Sheridan County rated poor (4.5%); 3 (4.5%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 40 ft
Location	3M W Medicine Lake
NBI structure number	L46406002+03001
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
S 5 over Marron Creek	1983	1,559	Fair
S 16 over Ator Creek	1984	1,559	Fair
S 5 over Antelope Creek	1986	1,120	Good
S 16 over Medicine Lake	1975	891	Fair
S 5 over Plentywood Creek	2001	589	Good
S 5 over Mccoy Creek	2001	589	Good