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Black Diamond Rd over Beaver Creek 011

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

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

Black Diamond Rd over Beaver Creek 011 in Wibaux 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 2017, making it 8 years old at the 2025 inventory.
It carries about 46 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 21 of the 25 inventoried bridges in Wibaux County rated fair (84.0%); 1 (4.0%) 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 84 ft
Location	6M SE Wibaux
NBI structure number	000000000004742
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 Yates Creek	1962	3,592	Fair
I 94 over Yates Creek	2000	3,592	Fair
I 94 over Beaver Creek	1974	1,796	Fair
I 94 over Int Carlyle Rd	1974	1,796	Fair
I 94 over Int Carlyle Rd	1974	1,796	Fair
S 7 over Beaver Creek	1949	1,671	Fair