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SH 3 over St Maries RR

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

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

SH 3 over St Maries RR in Benewah County, Idaho, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2019, making it 6 years old at the 2025 inventory.
It carries about 4,800 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 17 of the 48 inventoried bridges in Benewah County rated good (35.4%); 3 (6.2%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 119 ft
Location	In St Maries
NBI structure number	000000000018891
Condition class	Good

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 Joe River	2019	4,800	Good
US 95 over Sheep Creek	1975	3,500	Fair
US 95 over Hangman Creek	1975	3,500	Fair
SH 5 over Smrr;uprr;plummer Crk	2016	2,600	Fair