US Bridges

Old Highway 8 over Rock Creek

Fair

Klickitat County, Washington · 4.4 N JCT SR 14 · Structure no. 082126000000000

Built
1945
80 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
64 ft
1 main span
Daily traffic
43
2018 count
Owner
County
County Highway Agency

About this bridge

Old Highway 8 over Rock Creek is a steel stringer/multi-beam or girder carrying Old Highway 8 over Rock Creek in Klickitat County, Washington. It was built in 1945, so it is 80 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 43 vehicles a day, roughly 11% of them trucks, projected to reach 54 by 2040. The structure is 64 ft (19.4 m) long and 28 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesOld Highway 8
CrossesRock Creek
Location4.4 N JCT SR 14
RouteCounty Highway 37000
CountyKlickitat County
StateWashington
Coordinates45.74766, -120.43772
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length64 ft (19.4 m)
Longest span60 ft (18.3 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43 (2018)
Projected traffic54 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$726,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Highway 8 over Rock Creek built?

It was built in 1945, making it 80 years old in 2025.

What condition is Old Highway 8 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 Old Highway 8 over Rock Creek carry?

About 43 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is Old Highway 8 over Rock Creek?

The structure is 64 ft (19.4 m) long with a longest span of 60 ft (18.3 m) and a deck 28 ft wide.

Who owns Old Highway 8 over Rock Creek?

It is owned by the County Highway Agency.