US Bridges

SR 155 Spur over Okanogan River

Fair

Okanogan County, Washington · 0.2 W JCT SR 155 · Structure no. 000000HD0000000

Built
1923
102 years old
Condition
Fair
inspected March 2023
Type
Arch - Deck
Concrete
Length
410 ft
5 main spans
Daily traffic
5,987
2023 count
Owner
State
State Highway Agency

About this bridge

SR 155 Spur over Okanogan River is a concrete arch - deck carrying SR 155 Spur over Okanogan River in Okanogan County, Washington. It was built in 1923, so it is 102 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 5,987 vehicles a day, roughly 6% of them trucks, projected to reach 7,337 by 2039. The structure is 410 ft (125 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 155 Spur
CrossesOkanogan River
Location0.2 W JCT SR 155
RouteState Highway 155
CountyOkanogan County
StateWashington
Coordinates48.41053, -119.52589
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating27.4 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length410 ft (125 m)
Longest span100 ft (30.5 m)
Deck width32 ft (9.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,987 (2023)
Projected traffic7,337 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 155 Spur over Okanogan River built?

It was built in 1923, making it 102 years old in 2025.

What condition is SR 155 Spur over Okanogan River 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 March 2023.

How much traffic does SR 155 Spur over Okanogan River carry?

About 5,987 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 155 Spur over Okanogan River?

The structure is 410 ft (125 m) long with a longest span of 100 ft (30.5 m) and a deck 32 ft wide.

Who owns SR 155 Spur over Okanogan River?

It is owned by the State Highway Agency.