US Bridges

SH 3 over ST Maries RR

Good

Benewah County, Idaho · In ST Maries · Structure no. 000000000018891

Built
2019
6 years old
Condition
Good
inspected April 2022
Type
Tee Beam
Prestressed Concrete
Length
119 ft
1 main span
Daily traffic
4,800
2023 count
Owner
State
State Highway Agency

About this bridge

SH 3 over ST Maries RR is a prestressed concrete tee beam carrying SH 3 over ST Maries RR in Benewah County, Idaho. It was built in 2019, so it is 6 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,800 vehicles a day, roughly 10% of them trucks, projected to reach 7,200 by 2042. The structure is 119 ft (36.3 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 3
CrossesST Maries RR
LocationIn ST Maries
RouteState Highway 3
CountyBenewah County
StateIdaho
Coordinates47.31589, -116.56244
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating60.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length119 ft (36.3 m)
Longest span115 ft (35.1 m)
Deck width53 ft (16.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (2023)
Projected traffic7,200 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 3 over ST Maries RR built?

It was built in 2019, making it 6 years old in 2025.

What condition is SH 3 over ST Maries RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2022.

How much traffic does SH 3 over ST Maries RR carry?

About 4,800 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SH 3 over ST Maries RR?

The structure is 119 ft (36.3 m) long with a longest span of 115 ft (35.1 m) and a deck 53 ft wide.

Who owns SH 3 over ST Maries RR?

It is owned by the State Highway Agency.