US Bridges

Forest Road 1875 over S.Fk.Clwtr River

Fair

Idaho County, Idaho · 20 Mi. from Elk City Id · Structure no. 011708000000063

Built
1973
52 years old
Condition
Fair
inspected November 2022
Type
Box Beam or Girders - Multiple
Concrete
Length
360 ft
5 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 1875 over S.Fk.Clwtr River is a concrete box beam or girders - multiple carrying Forest Road 1875 over S.Fk.Clwtr River in Idaho County, Idaho. It was built in 1973, so it is 52 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 360 ft (109.7 m) long and 33 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesForest Road 1875
CrossesS.Fk.Clwtr River
Location20 Mi. from Elk City Id
RouteFederal Lands Road 1875
CountyIdaho County
StateIdaho
Coordinates45.80456, -115.69271
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating21.1 US tons
Inventory rating16.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length360 ft (109.7 m)
Longest span100 ft (30.5 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-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 1875 over S.Fk.Clwtr River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Forest Road 1875 over S.Fk.Clwtr 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 November 2022.

How much traffic does Forest Road 1875 over S.Fk.Clwtr River carry?

About 50 vehicles per day (latest count).

How long is Forest Road 1875 over S.Fk.Clwtr River?

The structure is 360 ft (109.7 m) long with a longest span of 100 ft (30.5 m) and a deck 33 ft wide.

Who owns Forest Road 1875 over S.Fk.Clwtr River?

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