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S 80-13th St over Missouri River

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

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

S 80-13th St over Missouri River in Chouteau County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1962, making it 63 years old at the 2025 inventory.
It carries about 930 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 2 of the 43 inventoried bridges in Chouteau County rated poor (4.7%); 2 (4.7%) 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	Continuous steel girder and floorbeam
Length	about 708 ft
Location	Fort Benton-13th St
NBI structure number	P00080002+04331
Condition class	Poor

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 over RR	1953	849	Fair
S 80 over Shonkin Creek	2003	696	Good