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S 5 over Big Muddy Creek

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

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

S 5 over Big Muddy Creek in Sheridan 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 2012, making it 13 years old at the 2025 inventory.
It carries about 511 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 52 of the 66 inventoried bridges in Sheridan County rated fair (78.8%); 3 (4.5%) 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 149 ft
Location	3M SE Redstone
NBI structure number	P00022025+04861
Condition class	Fair

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