US Bridges

FSR 60055 over Panther Creek

Fair

Lemhi County, Idaho · 2.4 Miles Nne of Cobalt · Structure no. 041301000001055

Built
1963
62 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
50
1989 count
Owner
Federal
U.S. Forest Service

About this bridge

FSR 60055 over Panther Creek is a steel stringer/multi-beam or girder carrying FSR 60055 over Panther Creek in Lemhi County, Idaho. It was built in 1963, so it is 62 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 2014. The structure is 51 ft (15.4 m) long and 28 ft wide.

CarriesFSR 60055
CrossesPanther Creek
Location2.4 Miles Nne of Cobalt
RouteFederal Lands Road 60055
StateIdaho
Coordinates45.12505, -114.16202
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating33.2 US tons
Inventory rating25 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length51 ft (15.4 m)
Longest span49 ft (14.9 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1989)
Projected traffic75 by 2014
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 FSR 60055 over Panther Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is FSR 60055 over Panther 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 FSR 60055 over Panther Creek carry?

About 50 vehicles per day (1989 count).

How long is FSR 60055 over Panther Creek?

The structure is 51 ft (15.4 m) long with a longest span of 49 ft (14.9 m) and a deck 28 ft wide.

Who owns FSR 60055 over Panther Creek?

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