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SH 3 over St Maries R(mashburn Br)

Benewah County, Idaho · rated Fair in the 2025 National Bridge Inventory

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

SH 3 over St Maries R(mashburn Br) in Benewah County, Idaho, 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 1961 and reconstructed in 2013, making it 64 years old at the 2025 inventory.
It carries about 1,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 28 of the 48 inventoried bridges in Benewah County rated fair (58.3%); 3 (6.2%) 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 166 ft
Location	12.3 S. St Maries
NBI structure number	000000000018860
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SH 3 over St Maries R;st Maries Br	1977	7,100	Fair
US 95 over RR Roadbed/no Tracks	1975	5,000	Fair
SH 3 over St Maries RR	2019	4,800	Good
SH 3 over St Joe River	2019	4,800	Good
US 95 over Sheep Creek	1975	3,500	Fair
US 95 over Hangman Creek	1975	3,500	Fair