US Bridges

SR 821 over Lower Wilson Creek

Fair

Kittitas County, Washington · 19.2 N Yakima CO · Structure no. 0001584A0000000

Built
1932
93 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
161 ft
4 main spans
Daily traffic
1,474
2023 count
Owner
State
State Highway Agency

About this bridge

SR 821 over Lower Wilson Creek is a concrete continuous tee beam carrying SR 821 over Lower Wilson Creek in Kittitas County, Washington. It was built in 1932, so it is 93 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 1,474 vehicles a day, roughly 8% of them trucks, projected to reach 1,861 by 2039. The structure is 161 ft (49.1 m) long and 31 ft wide. If it were closed, the detour would be 52.2 mi (84 km).

Location

Open in Google Maps
CarriesSR 821
CrossesLower Wilson Creek
Location19.2 N Yakima CO
RouteState Highway 821
CountyKittitas County
StateWashington
Coordinates46.91709, -120.50802
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length161 ft (49.1 m)
Longest span40 ft (12.2 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,474 (2023)
Projected traffic1,861 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.2 mi (84 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$2.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 821 over Lower Wilson Creek built?

It was built in 1932, making it 93 years old in 2025.

What condition is SR 821 over Lower Wilson 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 September 2023.

How much traffic does SR 821 over Lower Wilson Creek carry?

About 1,474 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 821 over Lower Wilson Creek?

The structure is 161 ft (49.1 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.

Who owns SR 821 over Lower Wilson Creek?

It is owned by the State Highway Agency.