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Irr Bia Rte 123 over South Fork Valley Creek

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

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

Irr Bia Rte 123 over South Fork Valley Creek in Sanders County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1995 and reconstructed in 2011, making it 30 years old at the 2025 inventory.
It carries about 20 vehicles a day (traffic count year 2021).
It is one of 10 of the 120 inventoried bridges in Sanders County rated poor (8.3%); 10 (8.3%) 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 27 ft
Location	10.3 Km From US Hwy 93
NBI structure number	00000000000P839
Condition class	Poor

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