US Bridges

STC4702;SALMON Rvr over Salmon Rvr (manning Crv)

Good

Idaho County, Idaho · 9.6 E. 1.3 S. Riggins · Structure no. 000000000029398

Built
2018
7 years old
Condition
Good
inspected May 2024
Type
Suspension
Steel
Length
319 ft
1 main span
Daily traffic
260
2023 count
Owner
County
County Highway Agency

About this bridge

STC4702;SALMON Rvr over Salmon Rvr (manning Crv) is a steel suspension carrying STC4702;SALMON Rvr over Salmon Rvr (manning Crv) in Idaho County, Idaho. It was built in 2018, so it is 7 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 260 vehicles a day, roughly 4% of them trucks, projected to reach 390 by 2042. The structure is 319 ft (97.2 m) long and 19 ft wide. If it were closed, the detour would be 118.1 mi (190 km).

Location

Open in Google Maps
CarriesSTC4702;SALMON Rvr
CrossesSalmon Rvr (manning Crv)
Location9.6 E. 1.3 S. Riggins
RouteCounty Highway 4702
CountyIdaho County
StateIdaho
Coordinates45.40186, -116.11668
Functional classRural Major Collector

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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating38.6 US tons

Structure

Structure typeSuspension
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHL 93
Structure length319 ft (97.2 m)
Longest span300 ft (91.4 m)
Deck width19 ft (5.8 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deck25 ft (7.7 m)

Traffic and service

Average daily traffic260 (2023)
Projected traffic390 by 2042
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed118.1 mi (190 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million (2020 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was STC4702;SALMON Rvr over Salmon Rvr (manning Crv) built?

It was built in 2018, making it 7 years old in 2025.

What condition is STC4702;SALMON Rvr over Salmon Rvr (manning Crv) 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 May 2024.

How much traffic does STC4702;SALMON Rvr over Salmon Rvr (manning Crv) carry?

About 260 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is STC4702;SALMON Rvr over Salmon Rvr (manning Crv)?

The structure is 319 ft (97.2 m) long with a longest span of 300 ft (91.4 m) and a deck 19 ft wide.

Who owns STC4702;SALMON Rvr over Salmon Rvr (manning Crv)?

It is owned by the County Highway Agency.