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5TH Ave S over Clark Fork 085

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

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

5TH Ave S over Clark Fork 085 in Sanders 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 5 (fair condition) on the 0-9 scale.
It was built in 1975, making it 50 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2025).
Its listed owner is the county highway agency.
It is one of 65 of the 120 inventoried bridges in Sanders County rated fair (54.2%); 10 (8.3%) 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 979 ft
Location	1M SW Plains
NBI structure number	L45139000+02001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
S 200 over Clark Fork River	1997	3,009	Fair
S 200 over Clark Fork River	1996	3,009	Fair
S 200 over RR	2000	2,686	Good
S 200 over Clark Fork River	1960	2,482	Poor
Irr - S 28 over Hot Springs Creek	1959	2,181	Fair
S 200 over Wildlife Crossing	2019	2,177	Good