US Bridges

SH 3 over ST Maries RR

Fair

Benewah County, Idaho · 11.8 S. ST Maries · Structure no. 000000000018865

Built
1961
64 years old, rebuilt 2006
Condition
Fair
inspected April 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
3 main spans
Daily traffic
1,700
2023 count
Owner
State
State Highway Agency

About this bridge

SH 3 over ST Maries RR is a prestressed concrete stringer/multi-beam or girder carrying SH 3 over ST Maries RR in Benewah County, Idaho. It was built in 1961 and reconstructed in 2006, so it is 64 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,700 vehicles a day, roughly 28% of them trucks, projected to reach 2,550 by 2042. The structure is 154 ft (46.9 m) long and 33 ft wide. If it were closed, the detour would be 87 mi (140 km).

Location

Open in Google Maps
CarriesSH 3
CrossesST Maries RR
Location11.8 S. ST Maries
RouteState Highway 3
CountyBenewah County
StateIdaho
Coordinates47.18167, -116.49492
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum 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 rating81 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span49 ft (14.9 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic2,550 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed87 mi (140 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.9 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SH 3 over ST Maries RR built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2006.

What condition is SH 3 over ST Maries RR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2022.

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

About 1,700 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is SH 3 over ST Maries RR?

The structure is 154 ft (46.9 m) long with a longest span of 49 ft (14.9 m) and a deck 33 ft wide.

Who owns SH 3 over ST Maries RR?

It is owned by the State Highway Agency.