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Shonkin Rd over Shonkin Creek 017

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

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

Shonkin Rd over Shonkin Creek 017 in Chouteau County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2011, making it 14 years old at the 2025 inventory.
It carries about 40 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 16 of the 43 inventoried bridges in Chouteau County rated fair (37.2%); 2 (4.7%) 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	Steel stringer or multi-beam girder
Length	about 53 ft
Location	1M W Shonkin
NBI structure number	L08201008+05001
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US 87 over Abandoned Railroad	1974	1,727	Fair
Irr - US 87 over School Section Coulee	1970	1,694	Good
Irr - US 87 over Big Sandy Creek	1990	1,694	Good
US 87 over Marias River	1988	1,417	Good
S 80-13th St over Missouri River	1962	930	Poor
S 80 over RR	1953	849	Fair