US Bridges

Johnson Creek Road over Johnson Creek

Fair

Thurston County, Washington · 1.8 M N Skookumchuck RD · Structure no. 080470000000000

Built
1977
48 years old
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
52 ft
2 main spans
Daily traffic
324
2021 count
Owner
County
County Highway Agency

About this bridge

Johnson Creek Road over Johnson Creek is a prestressed concrete slab carrying Johnson Creek Road over Johnson Creek in Thurston County, Washington. It was built in 1977, so it is 48 years old, younger 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 324 vehicles a day, roughly 10% of them trucks, projected to reach 501 by 2043. The structure is 52 ft (15.8 m) long and 29 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesJohnson Creek Road
CrossesJohnson Creek
Location1.8 M N Skookumchuck RD
RouteCounty Highway 12435
CountyThurston County
StateWashington
Coordinates46.81482, -122.73265
Functional classRural Major 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment6: Equal to present minimum criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span26 ft (7.9 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2021)
Projected traffic501 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$741,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Johnson Creek Road over Johnson Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Johnson Creek Road over Johnson 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 Johnson Creek Road over Johnson Creek carry?

About 324 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Johnson Creek Road over Johnson Creek?

The structure is 52 ft (15.8 m) long with a longest span of 26 ft (7.9 m) and a deck 29 ft wide.

Who owns Johnson Creek Road over Johnson Creek?

It is owned by the County Highway Agency.