US Bridges

Upper Hoh Road over Rock Creek

Fair

Jefferson County, Washington · 6.5E JCT SR101 · Structure no. 083836000000000

Built
1973
52 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
877
2020 count
Owner
County
County Highway Agency

About this bridge

Upper Hoh Road over Rock Creek is a prestressed concrete tee beam carrying Upper Hoh Road over Rock Creek in Jefferson County, Washington. It was built in 1973, so it is 52 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 877 vehicles a day, roughly 5% of them trucks, projected to reach 500 by 2040. The structure is 82 ft (25.1 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUpper Hoh Road
CrossesRock Creek
Location6.5E JCT SR101
RouteCounty Highway 91420
Coordinates47.81606, -124.13854
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length82 ft (25.1 m)
Longest span82 ft (24.9 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic877 (2020)
Projected traffic500 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Upper Hoh Road over Rock Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Upper Hoh 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 May 2024.

How much traffic does Upper Hoh Road over Rock Creek carry?

About 877 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Upper Hoh Road over Rock Creek?

The structure is 82 ft (25.1 m) long with a longest span of 82 ft (24.9 m) and a deck 31 ft wide.

Who owns Upper Hoh Road over Rock Creek?

It is owned by the County Highway Agency.