US Bridges

US 97 over Okanogan River

Fair

Okanogan County, Washington · 15.6 N JCT SR 20 · Structure no. 0003897A0000000

Built
1951
74 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
382 ft
7 main spans
Daily traffic
3,349
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over Okanogan River is a concrete continuous tee beam carrying US 97 over Okanogan River in Okanogan County, Washington. It was built in 1951, so it is 74 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 3,349 vehicles a day, roughly 11% of them trucks, projected to reach 4,029 by 2039. The structure is 382 ft (116.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 97
CrossesOkanogan River
Location15.6 N JCT SR 20
RouteU.S. Route 97
CountyOkanogan County
StateWashington
Coordinates48.92039, -119.42058
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating28 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 15
Structure length382 ft (116.4 m)
Longest span70 ft (21.3 m)
Deck width33 ft (10.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,349 (2023)
Projected traffic4,029 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 US 97 over Okanogan River built?

It was built in 1951, making it 74 years old in 2025.

What condition is US 97 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 US 97 over Okanogan River carry?

About 3,349 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 97 over Okanogan River?

The structure is 382 ft (116.4 m) long with a longest span of 70 ft (21.3 m) and a deck 33 ft wide.

Who owns US 97 over Okanogan River?

It is owned by the State Highway Agency.