US Bridges

US 97ALT over Entiat River

Fair

Chelan County, Washington · 14.3 N JCT US 2 · Structure no. 000000NJ0000000

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
406 ft
3 main spans
Daily traffic
7,739
2023 count
Owner
State
State Highway Agency

About this bridge

US 97ALT over Entiat River is a concrete continuous box beam or girders - multiple carrying US 97ALT over Entiat River in Chelan County, Washington. It was built in 1959, so it is 66 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 7,739 vehicles a day, roughly 7% of them trucks, projected to reach 9,033 by 2039. The structure is 406 ft (123.7 m) long and 31 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesUS 97ALT
CrossesEntiat River
Location14.3 N JCT US 2
RouteU.S. Route 97
CountyChelan County
StateWashington
Coordinates47.66089, -120.225
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating22.5 US tons
Inventory rating17.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length406 ft (123.7 m)
Longest span165 ft (50.3 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,739 (2023)
Projected traffic9,033 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 km)
TollOn a free road
National Highway SystemNo

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$8.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97ALT over Entiat River built?

It was built in 1959, making it 66 years old in 2025.

What condition is US 97ALT over Entiat 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 July 2024.

How much traffic does US 97ALT over Entiat River carry?

About 7,739 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 97ALT over Entiat River?

The structure is 406 ft (123.7 m) long with a longest span of 165 ft (50.3 m) and a deck 31 ft wide.

Who owns US 97ALT over Entiat River?

It is owned by the State Highway Agency.