US Bridges

I-82 over SR 821 Whipple Wasteway

Fair

Kittitas County, Washington · 3.2 E JCT I-90 · Structure no. 0008672B0000000

Built
1970
55 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
357 ft
3 main spans
Daily traffic
9,791
2023 count
Owner
State
State Highway Agency

About this bridge

I-82 over SR 821 Whipple Wasteway is a prestressed concrete continuous stringer/multi-beam or girder carrying I-82 over SR 821 Whipple Wasteway in Kittitas 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 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 9,791 vehicles a day, roughly 25% of them trucks, projected to reach 12,225 by 2039. The structure is 357 ft (108.8 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-82
CrossesSR 821 Whipple Wasteway
Location3.2 E JCT I-90
RouteInterstate 82
CountyKittitas County
StateWashington
Coordinates46.92642, -120.49869
Functional classRural Principal Arterial - Interstate

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 inspectionMarch 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length357 ft (108.8 m)
Longest span132 ft (40.2 m)
Deck width55 ft (16.9 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,791 (2023)
Projected traffic12,225 by 2039
Trucks25%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$9.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-82 over SR 821 Whipple Wasteway built?

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

What condition is I-82 over SR 821 Whipple Wasteway 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 2024.

How much traffic does I-82 over SR 821 Whipple Wasteway carry?

About 9,791 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-82 over SR 821 Whipple Wasteway?

The structure is 357 ft (108.8 m) long with a longest span of 132 ft (40.2 m) and a deck 55 ft wide.

Who owns I-82 over SR 821 Whipple Wasteway?

It is owned by the State Highway Agency.