US Bridges

4th Parallel Road over Turbine Canal

Fair

Kittitas County, Washington · 00.06 W Ross RD · Structure no. 084525000000000

Built
1955
70 years old, rebuilt 1970
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
26 ft
1 main span
Daily traffic
54
2023 count
Owner
County
County Highway Agency

About this bridge

4th Parallel Road over Turbine Canal is a concrete continuous stringer/multi-beam or girder carrying 4th Parallel Road over Turbine Canal in Kittitas County, Washington. It was built in 1955 and reconstructed in 1970, so it is 70 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 54 vehicles a day, roughly 49% of them trucks, projected to reach 278 by 2039. The structure is 26 ft (7.9 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries4th Parallel Road
CrossesTurbine Canal
Location00.06 W Ross RD
RouteCounty Highway 67014
CountyKittitas County
StateWashington
Coordinates46.91219, -120.3312
Functional classRural Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckOther
Main spans1
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span24 ft (7.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic54 (2023)
Projected traffic278 by 2039
Trucks49%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 4th Parallel Road over Turbine Canal built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1970.

What condition is 4th Parallel Road over Turbine Canal 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 November 2023.

How much traffic does 4th Parallel Road over Turbine Canal carry?

About 54 vehicles per day (2023 count), of which roughly 49% are trucks.

How long is 4th Parallel Road over Turbine Canal?

The structure is 26 ft (7.9 m) long with a longest span of 24 ft (7.3 m) and a deck 26 ft wide.

Who owns 4th Parallel Road over Turbine Canal?

It is owned by the County Highway Agency.