US Bridges

Colockum Road over Hiline Canal

Fair

Kittitas County, Washington · 00.15 N Brick Mill · Structure no. 082147000000000

Built
1931
94 years old, rebuilt 1963
Condition
Fair
inspected November 2024
Type
Channel Beam
Concrete
Length
44 ft
2 main spans
Daily traffic
158
2023 count
Owner
County
County Highway Agency

About this bridge

Colockum Road over Hiline Canal is a concrete channel beam carrying Colockum Road over Hiline Canal in Kittitas County, Washington. It was built in 1931 and reconstructed in 1963, so it is 94 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 158 vehicles a day, roughly 41% of them trucks, projected to reach 418 by 2043. The structure is 44 ft (13.4 m) long and 24 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesColockum Road
CrossesHiline Canal
Location00.15 N Brick Mill
RouteCounty Highway 44263
CountyKittitas County
StateWashington
Coordinates47.04803, -120.36948
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 inspectionNovember 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 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 rating34.9 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans2
Design loadH 20
Structure length44 ft (13.4 m)
Longest span26 ft (7.9 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic158 (2023)
Projected traffic418 by 2043
Trucks41%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Colockum Road over Hiline Canal built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1963.

What condition is Colockum Road 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 November 2024.

How much traffic does Colockum Road over Hiline Canal carry?

About 158 vehicles per day (2023 count), of which roughly 41% are trucks.

How long is Colockum Road over Hiline Canal?

The structure is 44 ft (13.4 m) long with a longest span of 26 ft (7.9 m) and a deck 24 ft wide.

Who owns Colockum Road over Hiline Canal?

It is owned by the County Highway Agency.