US Bridges

Beaver-Loon Road over W.Fk. Mayfield Creek

Fair

Custer County, Idaho · No Data Entered · Structure no. 040603000001163

Built
1968
57 years old, rebuilt 1999
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
1 main span
Daily traffic
10
1994 count
Owner
Federal
U.S. Forest Service

About this bridge

Beaver-Loon Road over W.Fk. Mayfield Creek is a wood or timber stringer/multi-beam or girder carrying Beaver-Loon Road over W.Fk. Mayfield Creek in Custer County, Idaho. It was built in 1968 and reconstructed in 1999, so it is 57 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 10 vehicles a day, projected to reach 50 by 2015. The structure is 32 ft (9.9 m) long and 15 ft wide. If it were closed, the detour would be 94.4 mi (152 km).

Location

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CarriesBeaver-Loon Road
CrossesW.Fk. Mayfield Creek
LocationNo Data Entered
RouteFederal Lands Road 40172
CountyCuster County
StateIdaho
Coordinates44.52133, -114.78163
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 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 alignment6: Equal to present minimum criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length32 ft (9.9 m)
Longest span31 ft (9.4 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1994)
Projected traffic50 by 2015
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed94.4 mi (152 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 Beaver-Loon Road over W.Fk. Mayfield Creek built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1999.

What condition is Beaver-Loon Road over W.Fk. Mayfield 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 October 2023.

How much traffic does Beaver-Loon Road over W.Fk. Mayfield Creek carry?

About 10 vehicles per day (1994 count).

How long is Beaver-Loon Road over W.Fk. Mayfield Creek?

The structure is 32 ft (9.9 m) long with a longest span of 31 ft (9.4 m) and a deck 15 ft wide.

Who owns Beaver-Loon Road over W.Fk. Mayfield Creek?

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