US Bridges

US 101 over Hoh River

Fair

Jefferson County, Washington · 25.1 N Grays Hbr CO · Structure no. 0001457A0000000

Built
1931
94 years old
Condition
Fair
inspected June 2024
Type
Truss - Deck
Steel
Length
497 ft
3 main spans
Daily traffic
1,438
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Hoh River is a steel truss - deck carrying US 101 over Hoh River in Jefferson County, Washington. It was built in 1931, 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 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 1,438 vehicles a day, roughly 23% of them trucks, projected to reach 2,303 by 2039. The structure is 497 ft (151.5 m) long and 23 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 101
CrossesHoh River
Location25.1 N Grays Hbr CO
RouteU.S. Route 101
CountyJefferson County
StateWashington
Coordinates47.80698, -124.24986
Functional classRural Principal Arterial - Other

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 15
Structure length497 ft (151.5 m)
Longest span250 ft (76.2 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,438 (2023)
Projected traffic2,303 by 2039
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.1 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 101 over Hoh River built?

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

What condition is US 101 over Hoh River 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 June 2024.

How much traffic does US 101 over Hoh River carry?

About 1,438 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is US 101 over Hoh River?

The structure is 497 ft (151.5 m) long with a longest span of 250 ft (76.2 m) and a deck 23 ft wide.

Who owns US 101 over Hoh River?

It is owned by the State Highway Agency.