US Bridges

Fs Route No. 311 over S.F. Granite CR

Fair

Pend Oreille County, Washington · South Fork Granite Creek · Structure no. 010408000000184

Built
1952
73 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
35 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fs Route No. 311 over S.F. Granite CR is a wood or timber stringer/multi-beam or girder carrying Fs Route No. 311 over S.F. Granite CR in Pend Oreille County, Washington. It was built in 1952, so it is 73 years old, older than the Washington average of 49.8 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 2045. The structure is 35 ft (10.6 m) long and 15 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

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CarriesFs Route No. 311
CrossesS.F. Granite CR
LocationSouth Fork Granite Creek
RouteFederal Lands Road 311
CountyPend Oreille County
StateWashington
Coordinates48.69269, -117.04129
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to 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 rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadOther
Structure length35 ft (10.6 m)
Longest span33 ft (10.1 m)
Deck width15 ft (4.7 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. 311 over S.F. Granite CR built?

It was built in 1952, making it 73 years old in 2025.

What condition is Fs Route No. 311 over S.F. Granite CR 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 September 2023.

How much traffic does Fs Route No. 311 over S.F. Granite CR carry?

About 50 vehicles per day (latest count).

How long is Fs Route No. 311 over S.F. Granite CR?

The structure is 35 ft (10.6 m) long with a longest span of 33 ft (10.1 m) and a deck 15 ft wide.

Who owns Fs Route No. 311 over S.F. Granite CR?

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