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S 59 over North Fork Sunday Creek

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

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

S 59 over North Fork Sunday Creek in Custer County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1963, making it 62 years old at the 2025 inventory.
It carries about 727 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 54 of the 71 inventoried bridges in Custer County rated fair (76.1%); 6 (8.5%) 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	Prestressed concrete stringer or multi-beam girder
Length	about 122 ft
Location	10M NW Miles City
NBI structure number	P00018011+00851
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 94 over Lignite Creek	1964	4,724	Fair
I 94 over Coal Creek	1963	4,724	Fair
I 94 over Tongue River	1961	4,707	Fair
I 94 over Vehicle Pass	1986	4,697	Good
I 94 over Jones Creek-stockpass	1962	4,393	Fair
S 59 over Yellowstone River	1957	2,949	Fair