US Bridges

First Avenue over Salmon Creek

FairPosted for load

Okanogan County, Washington · .3 MI S of Oak ST · Structure no. 085260000000000

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
260
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

First Avenue over Salmon Creek is a prestressed concrete stringer/multi-beam or girder carrying First Avenue over Salmon Creek in Okanogan County, Washington. It was built in 1970, so it is 55 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. Its operating status is: posted for load restriction.

It carries about 260 vehicles a day, roughly 5% of them trucks, projected to reach 310 by 2041. The structure is 38 ft (11.6 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFirst Avenue
CrossesSalmon Creek
Location.3 MI S of Oak ST
RouteCity Street 915
Coordinates48.36067, -119.58317
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26.1 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length38 ft (11.6 m)
Longest span37 ft (11.3 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2021)
Projected traffic310 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was First Avenue over Salmon Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is First Avenue over Salmon 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 First Avenue over Salmon Creek carry?

About 260 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is First Avenue over Salmon Creek?

The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.3 m) and a deck 40 ft wide.

Who owns First Avenue over Salmon Creek?

It is owned by the City or Municipal Highway Agency.