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S 5 over Antelope Creek

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

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

S 5 over Antelope Creek in Sheridan County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1986, making it 39 years old at the 2025 inventory.
It carries about 1,120 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 11 of the 66 inventoried bridges in Sheridan County rated good (16.7%); 3 (4.5%) are rated poor.
Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
Its condition class and component ratings are unchanged from the 2024 inventory.
Its most recent inspection on record is dated September 2023, on a 24-month routine inspection cycle.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings

Component	Rating (2024)	Rating (2025)	FHWA scale meaning
Culvert	7	7	Good condition


Structure	Steel culvert
Length	about 20 ft
Location	2M S Antelope
NBI structure number	P00022051+03461
Condition class	Good
Traffic status (item 41)	Open, no restriction
Last inspection (item 90)	September 2023
Inspection interval (item 91)	24 months
Scour (item 113)	8: foundations stable, scour above the top of the footing

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 16 over Medicine Lake	1975	891	Fair
S 5 over Plentywood Creek	2001	589	Good
S 5 over Mccoy Creek	2001	589	Good
S 5 over Redstone Creek	2011	511	Good