US Bridges

US 101 over Dosewallips River

Good

Jefferson County, Washington · 21.5 S JCT SR 104 · Structure no. 0015565A0000000

Built
2000
25 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
482 ft
3 main spans
Daily traffic
3,336
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Dosewallips River is a steel continuous stringer/multi-beam or girder carrying US 101 over Dosewallips River in Jefferson County, Washington. It was built in 2000, so it is 25 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,336 vehicles a day, roughly 11% of them trucks, projected to reach 4,570 by 2039. The structure is 482 ft (146.9 m) long and 44 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesUS 101
CrossesDosewallips River
Location21.5 S JCT SR 104
RouteU.S. Route 101
CountyJefferson County
StateWashington
Coordinates47.69075, -122.89886
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
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 rating85 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 25 or greater
Structure length482 ft (146.9 m)
Longest span202 ft (61.6 m)
Deck width44 ft (13.5 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,336 (2023)
Projected traffic4,570 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$8.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Dosewallips River built?

It was built in 2000, making it 25 years old in 2025.

What condition is US 101 over Dosewallips River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does US 101 over Dosewallips River carry?

About 3,336 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 101 over Dosewallips River?

The structure is 482 ft (146.9 m) long with a longest span of 202 ft (61.6 m) and a deck 44 ft wide.

Who owns US 101 over Dosewallips River?

It is owned by the State Highway Agency.