US Bridges

US 97 over Okanogan River

Fair

Okanogan County, Washington · 0.7 N JCT SR 155 · Structure no. 0007308A0000000

Built
1964
61 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
418 ft
5 main spans
Daily traffic
8,828
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over Okanogan River is a concrete continuous box beam or girders - multiple carrying US 97 over Okanogan River in Okanogan County, Washington. It was built in 1964, so it is 61 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 8,828 vehicles a day, roughly 8% of them trucks, projected to reach 10,361 by 2039. The structure is 418 ft (127.4 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesUS 97
CrossesOkanogan River
Location0.7 N JCT SR 155
RouteU.S. Route 97
CountyOkanogan County
StateWashington
Coordinates48.41172, -119.51339
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating58 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length418 ft (127.4 m)
Longest span92 ft (28 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,828 (2023)
Projected traffic10,361 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$8.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 over Okanogan River built?

It was built in 1964, making it 61 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 August 2024.

How much traffic does US 97 over Okanogan River carry?

About 8,828 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 97 over Okanogan River?

The structure is 418 ft (127.4 m) long with a longest span of 92 ft (28 m) and a deck 33 ft wide.

Who owns US 97 over Okanogan River?

It is owned by the State Highway Agency.