US Bridges

I-82 over Lmuma Creek

Fair

Kittitas County, Washington · 11.8 E JCT SR 821 · Structure no. 0008710B0000000

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
423 ft
3 main spans
Daily traffic
10,035
2023 count
Owner
State
State Highway Agency

About this bridge

I-82 over Lmuma Creek is a concrete continuous box beam or girders - multiple carrying I-82 over Lmuma Creek 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 5 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 10,035 vehicles a day, roughly 25% of them trucks, projected to reach 12,740 by 2039. The structure is 423 ft (128.9 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-82
CrossesLmuma Creek
Location11.8 E JCT SR 821
RouteInterstate 82
Coordinates46.80041, -120.35889
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating38.9 US tons
Inventory rating30 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length423 ft (128.9 m)
Longest span167 ft (50.9 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,035 (2023)
Projected traffic12,740 by 2039
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-82 over Lmuma Creek built?

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

What condition is I-82 over Lmuma Creek 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 October 2023.

How much traffic does I-82 over Lmuma Creek carry?

About 10,035 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-82 over Lmuma Creek?

The structure is 423 ft (128.9 m) long with a longest span of 167 ft (50.9 m) and a deck 41 ft wide.

Who owns I-82 over Lmuma Creek?

It is owned by the State Highway Agency.