US Bridges

US 95 over Salmon River;goff Bridge

Fair

Idaho County, Idaho · 1.3 N. Riggins · Structure no. 000000000018331

Built
1999
26 years old
Condition
Fair
inspected February 2024
Type
Arch - Thru
Steel
Length
495 ft
1 main span
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 95 over Salmon River;goff Bridge is a steel arch - thru carrying US 95 over Salmon River;goff Bridge in Idaho County, Idaho. It was built in 1999, so it is 26 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 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 2,200 vehicles a day, roughly 63% of them trucks, projected to reach 3,300 by 2042. The structure is 495 ft (150.9 m) long and 54 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 95
CrossesSalmon River;goff Bridge
Location1.3 N. Riggins
RouteU.S. Route 95
CountyIdaho County
StateIdaho
Coordinates45.44417, -116.31167
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating50 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+1 approach)
Design loadHS 25 or greater
Structure length495 ft (150.9 m)
Longest span400 ft (121.9 m)
Deck width54 ft (16.6 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deck23 ft (6.9 m)

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic3,300 by 2042
Trucks63%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

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$6.8 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 95 over Salmon River;goff Bridge built?

It was built in 1999, making it 26 years old in 2025.

What condition is US 95 over Salmon River;goff Bridge 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 February 2024.

How much traffic does US 95 over Salmon River;goff Bridge carry?

About 2,200 vehicles per day (2023 count), of which roughly 63% are trucks.

How long is US 95 over Salmon River;goff Bridge?

The structure is 495 ft (150.9 m) long with a longest span of 400 ft (121.9 m) and a deck 54 ft wide.

Who owns US 95 over Salmon River;goff Bridge?

It is owned by the State Highway Agency.