US Bridges

Imrie Road over Rock Creek

Fair

Klickitat County, Washington · 3.06 S JCT CR 34000 · Structure no. 083297000000000

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
2
2023 count
Owner
County
County Highway Agency

About this bridge

Imrie Road over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying Imrie Road over Rock Creek in Klickitat County, Washington. It was built in 1965, so it is 60 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 2 vehicles a day, roughly 30% of them trucks, projected to reach 2 by 2045. The structure is 73 ft (22.3 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesImrie Road
CrossesRock Creek
Location3.06 S JCT CR 34000
RouteCounty Highway 37490
CountyKlickitat County
StateWashington
Coordinates45.805, -120.50866
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
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 protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating106.8 US tons
Inventory rating67.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span70 ft (21.3 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2 (2023)
Projected traffic2 by 2045
Trucks30%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$520,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Imrie Road over Rock Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Imrie Road over Rock 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 July 2023.

How much traffic does Imrie Road over Rock Creek carry?

About 2 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is Imrie Road over Rock Creek?

The structure is 73 ft (22.3 m) long with a longest span of 70 ft (21.3 m) and a deck 16 ft wide.

Who owns Imrie Road over Rock Creek?

It is owned by the County Highway Agency.