US Bridges

Forest Road 1858 over Newsome Creek

Good

Idaho County, Idaho · Newsome Town Site · Structure no. 011708000000017

Built
1966
59 years old, rebuilt 1991
Condition
Good
inspected September 2020
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
1 main span
Daily traffic
40
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 1966 and reconstructed in 1991, so it is 59 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 32 ft (9.8 m) long and 25 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesForest Road 1858
CrossesNewsome Creek
LocationNewsome Town Site
RouteFederal Lands Road 1858
StateIdaho
Coordinates45.90787, -115.62982
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 inspectionSeptember 2020
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 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 1858 over Newsome Creek built?

It was built in 1966, making it 59 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 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 September 2020.

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

About 40 vehicles per day (latest count).

How long is Forest Road 1858 over Newsome Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 25 ft wide.

Who owns Forest Road 1858 over Newsome Creek?

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