US Bridges

Quillayute Road over Sol Duc River

FairPosted for load

Clallam County, Washington · 3.4 W JCT SR101 · Structure no. 081327000000000

Built
1962
63 years old
Condition
Fair
inspected January 2024
Type
Truss - Thru
Steel
Length
224 ft
1 main span
Daily traffic
452
2022 count
Owner
County
County Highway Agency

About this bridge

Quillayute Road over Sol Duc River is a steel truss - thru carrying Quillayute Road over Sol Duc River in Clallam County, Washington. It was built in 1962, so it is 63 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. Its operating status is: posted for load restriction.

It carries about 452 vehicles a day, roughly 25% of them trucks, projected to reach 735 by 2044. The structure is 224 ft (68.3 m) long and 21 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesQuillayute Road
CrossesSol Duc River
Location3.4 W JCT SR101
RouteCounty Highway 11200
CountyClallam County
StateWashington
Coordinates47.95119, -124.46833
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 15
Structure length224 ft (68.3 m)
Longest span150 ft (45.7 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic452 (2022)
Projected traffic735 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Quillayute Road over Sol Duc River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Quillayute Road 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 January 2024.

How much traffic does Quillayute Road over Sol Duc River carry?

About 452 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is Quillayute Road over Sol Duc River?

The structure is 224 ft (68.3 m) long with a longest span of 150 ft (45.7 m) and a deck 21 ft wide.

Who owns Quillayute Road over Sol Duc River?

It is owned by the County Highway Agency.