US Bridges

Fs Route No. 509 over Bluff Creek

Fair

Shoshone County, Idaho · Bluff Creek · Structure no. 010402000000125

Built
1993
32 years old
Condition
Fair
inspected July 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fs Route No. 509 over Bluff Creek is a steel stringer/multi-beam or girder carrying Fs Route No. 509 over Bluff Creek in Shoshone County, Idaho. It was built in 1993, so it is 32 years old, younger 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 5 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 60 ft (18.2 m) long and 14 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesFs Route No. 509
CrossesBluff Creek
LocationBluff Creek
RouteFederal Lands Road 509
CountyShoshone County
StateIdaho
Coordinates47.17577, -115.50119
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22.8 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length60 ft (18.2 m)
Longest span58 ft (17.7 m)
Deck width14 ft (4.4 m)
Roadway width14 ft (4.3 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 closed620.7 mi (999 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 Fs Route No. 509 over Bluff Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Fs Route No. 509 over Bluff 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 July 2022.

How much traffic does Fs Route No. 509 over Bluff Creek carry?

About 50 vehicles per day (latest count).

How long is Fs Route No. 509 over Bluff Creek?

The structure is 60 ft (18.2 m) long with a longest span of 58 ft (17.7 m) and a deck 14 ft wide.

Who owns Fs Route No. 509 over Bluff Creek?

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