US Bridges

Middle Fork Road over M.Fk.Weiser River

Good

Adams County, Idaho · 4.3 S. 2.0 W. Council · Structure no. 000000000026505

Built
1977
48 years old, rebuilt 1996
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
10
2023 count
Owner
County
County Highway Agency

About this bridge

Middle Fork Road over M.Fk.Weiser River is a steel stringer/multi-beam or girder carrying Middle Fork Road over M.Fk.Weiser River in Adams County, Idaho. It was built in 1977 and reconstructed in 1996, so it is 48 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 10 vehicles a day, projected to reach 15 by 2042. The structure is 31 ft (9.4 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesMiddle Fork Road
CrossesM.Fk.Weiser River
Location4.3 S. 2.0 W. Council
RouteCounty Highway 0
CountyAdams County
StateIdaho
Coordinates44.66589, -116.47825
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width16 ft (5 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2023)
Projected traffic15 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Middle Fork Road over M.Fk.Weiser River built?

It was built in 1977, making it 48 years old in 2025. It was reconstructed in 1996.

What condition is Middle Fork Road over M.Fk.Weiser 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 September 2024.

How much traffic does Middle Fork Road over M.Fk.Weiser River carry?

About 10 vehicles per day (2023 count).

How long is Middle Fork Road over M.Fk.Weiser River?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 16 ft wide.

Who owns Middle Fork Road over M.Fk.Weiser River?

It is owned by the County Highway Agency.