US Bridges

US 101 over Sol Duc River

Fair

Clallam County, Washington · 1.2 N JCT SR 110 · Structure no. 0005638A0000000

Built
1958
67 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
262 ft
1 main span
Daily traffic
4,018
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Sol Duc River is a steel truss - thru carrying US 101 over Sol Duc River in Clallam County, Washington. It was built in 1958, so it is 67 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 4,018 vehicles a day, roughly 10% of them trucks, projected to reach 5,452 by 2039. The structure is 262 ft (79.9 m) long and 31 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 101
CrossesSol Duc River
Location1.2 N JCT SR 110
RouteU.S. Route 101
CountyClallam County
StateWashington
Coordinates47.98364, -124.39869
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length262 ft (79.9 m)
Longest span150 ft (45.7 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic4,018 (2023)
Projected traffic5,452 by 2039
Trucks10%
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$5 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 101 over Sol Duc River built?

It was built in 1958, making it 67 years old in 2025.

What condition is US 101 over Sol Duc 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 Sol Duc River carry?

About 4,018 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 101 over Sol Duc River?

The structure is 262 ft (79.9 m) long with a longest span of 150 ft (45.7 m) and a deck 31 ft wide.

Who owns US 101 over Sol Duc River?

It is owned by the State Highway Agency.