US Bridges

US 101 over Little Quilcene River

Fair

Jefferson County, Washington · 8.4 S JCT SR 104 · Structure no. 0002438A0000000

Built
1938
87 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
104 ft
5 main spans
Daily traffic
2,792
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Little Quilcene River is a wood or timber stringer/multi-beam or girder carrying US 101 over Little Quilcene River in Jefferson County, Washington. It was built in 1938, so it is 87 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 2,792 vehicles a day, roughly 11% of them trucks, projected to reach 3,647 by 2039. The structure is 104 ft (31.7 m) long and 30 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesUS 101
CrossesLittle Quilcene River
Location8.4 S JCT SR 104
RouteU.S. Route 101
CountyJefferson County
StateWashington
Coordinates47.83794, -122.88769
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 inspectionOctober 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length104 ft (31.7 m)
Longest span36 ft (11 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,792 (2023)
Projected traffic3,647 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Little Quilcene River built?

It was built in 1938, making it 87 years old in 2025.

What condition is US 101 over Little Quilcene 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 October 2024.

How much traffic does US 101 over Little Quilcene River carry?

About 2,792 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 101 over Little Quilcene River?

The structure is 104 ft (31.7 m) long with a longest span of 36 ft (11 m) and a deck 30 ft wide.

Who owns US 101 over Little Quilcene River?

It is owned by the State Highway Agency.