US Bridges

Mid Salmon/Boulder over N. Fk Boulder CR

Fair

Okanogan County, Washington · No Data Entered · Structure no. 060805000001026

Built
1960
65 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
41 ft
1 main span
Daily traffic
35
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Mid Salmon/Boulder over N. Fk Boulder CR is a wood or timber stringer/multi-beam or girder carrying Mid Salmon/Boulder over N. Fk Boulder CR in Okanogan County, Washington. It was built in 1960, so it is 65 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 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 35 vehicles a day, projected to reach 52 by 2045. The structure is 41 ft (12.5 m) long and 18 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesMid Salmon/Boulder
CrossesN. Fk Boulder CR
LocationNo Data Entered
RouteFederal Lands Road 37000
CountyOkanogan County
StateWashington
Coordinates48.6141, -120.07126
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating27.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadOther
Structure length41 ft (12.5 m)
Longest span39 ft (11.9 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (1992)
Projected traffic52 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 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 Mid Salmon/Boulder over N. Fk Boulder CR built?

It was built in 1960, making it 65 years old in 2025.

What condition is Mid Salmon/Boulder over N. Fk Boulder 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 July 2023.

How much traffic does Mid Salmon/Boulder over N. Fk Boulder CR carry?

About 35 vehicles per day (1992 count).

How long is Mid Salmon/Boulder over N. Fk Boulder CR?

The structure is 41 ft (12.5 m) long with a longest span of 39 ft (11.9 m) and a deck 18 ft wide.

Who owns Mid Salmon/Boulder over N. Fk Boulder CR?

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