US Bridges

Forest Road 1614 over Salmon River

FairPosted for load

Idaho County, Idaho · 6.4 Mi. from Riggins Id · Structure no. 011701000001002

Built
1949
76 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
445 ft
1 main span
Daily traffic
140
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 1614 over Salmon River is a steel truss - thru carrying Forest Road 1614 over Salmon River in Idaho County, Idaho. It was built in 1949, so it is 76 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. Its operating status is: posted for load restriction.

It carries about 140 vehicles a day, roughly 20% of them trucks, projected to reach 210 by 2045. The structure is 445 ft (135.6 m) long and 20 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesForest Road 1614
CrossesSalmon River
Location6.4 Mi. from Riggins Id
RouteCounty Highway 1614
CountyIdaho County
StateIdaho
Coordinates45.39984, -116.21499
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating20 US tons
Inventory rating15.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length445 ft (135.6 m)
Longest span250 ft (76.2 m)
Deck width20 ft (6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic140 (1992)
Projected traffic210 by 2045
Trucks20%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forest Road 1614 over Salmon River built?

It was built in 1949, making it 76 years old in 2025.

What condition is Forest Road 1614 over Salmon 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 June 2024.

How much traffic does Forest Road 1614 over Salmon River carry?

About 140 vehicles per day (1992 count), of which roughly 20% are trucks.

How long is Forest Road 1614 over Salmon River?

The structure is 445 ft (135.6 m) long with a longest span of 250 ft (76.2 m) and a deck 20 ft wide.

Who owns Forest Road 1614 over Salmon River?

It is owned by the U.S. Forest Service.