US Bridges

STC5711;ST Joe Rvr over ST Joe River

Fair

Shoshone County, Idaho · 16.2 E. St. Maries · Structure no. 000000000020355

Built
1985
40 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
556 ft
3 main spans
Daily traffic
930
2023 count
Owner
County
County Highway Agency

About this bridge

STC5711;ST Joe Rvr over ST Joe River is a steel continuous stringer/multi-beam or girder carrying STC5711;ST Joe Rvr over ST Joe River in Shoshone County, Idaho. It was built in 1985, so it is 40 years old, younger 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 5 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 930 vehicles a day, roughly 22% of them trucks, projected to reach 1,395 by 2042. The structure is 556 ft (169.5 m) long and 35 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSTC5711;ST Joe Rvr
CrossesST Joe River
Location16.2 E. St. Maries
RouteCounty Highway 5711
CountyShoshone County
StateIdaho
Coordinates47.32172, -116.28697
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length556 ft (169.5 m)
Longest span220 ft (67.1 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic930 (2023)
Projected traffic1,395 by 2042
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was STC5711;ST Joe Rvr over ST Joe River built?

It was built in 1985, making it 40 years old in 2025.

What condition is STC5711;ST Joe Rvr over ST Joe River 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 August 2023.

How much traffic does STC5711;ST Joe Rvr over ST Joe River carry?

About 930 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is STC5711;ST Joe Rvr over ST Joe River?

The structure is 556 ft (169.5 m) long with a longest span of 220 ft (67.1 m) and a deck 35 ft wide.

Who owns STC5711;ST Joe Rvr over ST Joe River?

It is owned by the County Highway Agency.