US Bridges

Forest Road 1858 over Newsome Creek

Fair

Idaho County, Idaho · Newsome Drainage · Structure no. 011708000000016

Built
1961
64 years old, rebuilt 1991
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
50 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Forest Road 1858 over Newsome Creek is a wood or timber stringer/multi-beam or girder carrying Forest Road 1858 over Newsome Creek in Idaho County, Idaho. It was built in 1961 and reconstructed in 1991, so it is 64 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 50 ft (15.2 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesForest Road 1858
CrossesNewsome Creek
LocationNewsome Drainage
RouteFederal Lands Road 1858
CountyIdaho County
StateIdaho
Coordinates45.85723, -115.61799
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2022
Inspection intervalevery 24 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 rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length50 ft (15.2 m)
Longest span49 ft (14.9 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
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 1858 over Newsome Creek built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1991.

What condition is Forest Road 1858 over Newsome Creek 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 August 2022.

How much traffic does Forest Road 1858 over Newsome Creek carry?

About 50 vehicles per day (latest count).

How long is Forest Road 1858 over Newsome Creek?

The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.9 m) and a deck 15 ft wide.

Who owns Forest Road 1858 over Newsome Creek?

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