US Bridges

Robbins RD over Hiline Canal

FairPosted for load

Kittitas County, Washington · 00.34 N Smithson RD · Structure no. 083469000000000

Built
1955
70 years old, rebuilt 1977
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
55 ft
1 main span
Daily traffic
218
2022 count
Owner
County
County Highway Agency

About this bridge

Robbins RD over Hiline Canal is a concrete channel beam carrying Robbins RD over Hiline Canal in Kittitas County, Washington. It was built in 1955 and reconstructed in 1977, 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. Its operating status is: posted for load restriction.

It carries about 218 vehicles a day, roughly 35% of them trucks, projected to reach 453 by 2038. The structure is 55 ft (16.8 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesRobbins RD
CrossesHiline Canal
Location00.34 N Smithson RD
RouteCounty Highway 35285
CountyKittitas County
StateWashington
Coordinates47.10765, -120.56057
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23 US tons
Inventory rating17 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span53 ft (16.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218 (2022)
Projected traffic453 by 2038
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Robbins RD over Hiline Canal built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1977.

What condition is Robbins RD over Hiline 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 October 2023.

How much traffic does Robbins RD over Hiline Canal carry?

About 218 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is Robbins RD over Hiline Canal?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.2 m) and a deck 30 ft wide.

Who owns Robbins RD over Hiline Canal?

It is owned by the County Highway Agency.