US Bridges

Forest Road 1803 over Red River

Good

Idaho County, Idaho · 2 Mi. from Elk City · Structure no. 011708000000108

Built
1967
58 years old
Condition
Good
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
40
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 1803 over Red River is a prestressed concrete stringer/multi-beam or girder carrying Forest Road 1803 over Red River in Idaho County, Idaho. It was built in 1967, so it is 58 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40 vehicles a day, projected to reach 60 by 2045. The structure is 100 ft (30.5 m) long and 30 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesForest Road 1803
CrossesRed River
Location2 Mi. from Elk City
RouteFederal Lands Road 1803
StateIdaho
Coordinates45.8087, -115.47425
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating36.8 US tons
Inventory rating28.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span57 ft (17.5 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (—)
Projected traffic60 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 1803 over Red River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Forest Road 1803 over Red River 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 August 2022.

How much traffic does Forest Road 1803 over Red River carry?

About 40 vehicles per day (latest count).

How long is Forest Road 1803 over Red River?

The structure is 100 ft (30.5 m) long with a longest span of 57 ft (17.5 m) and a deck 30 ft wide.

Who owns Forest Road 1803 over Red River?

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