US Bridges

US 101 over Humptulips River

Fair

Grays Harbor County, Washington · 21.5 N JCT SR 109 · Structure no. 0003765B0000000

Built
1950
75 years old
Condition
Fair
inspected April 2024
Type
Truss - Thru
Steel
Length
450 ft
1 main span
Daily traffic
2,244
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Humptulips River is a steel truss - thru carrying US 101 over Humptulips River in Grays Harbor County, Washington. It was built in 1950, so it is 75 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 6 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 2,244 vehicles a day, roughly 15% of them trucks, projected to reach 2,536 by 2039. The structure is 450 ft (137.2 m) long and 32 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

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CarriesUS 101
CrossesHumptulips River
Location21.5 N JCT SR 109
RouteU.S. Route 101
CountyGrays Harbor County
StateWashington
Coordinates47.22948, -123.96225
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
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 rating65 US tons
Inventory rating39 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length450 ft (137.2 m)
Longest span260 ft (79.2 m)
Deck width32 ft (9.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic2,244 (2023)
Projected traffic2,536 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed31.7 mi (51 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$8.6 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 101 over Humptulips River built?

It was built in 1950, making it 75 years old in 2025.

What condition is US 101 over Humptulips 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 April 2024.

How much traffic does US 101 over Humptulips River carry?

About 2,244 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 101 over Humptulips River?

The structure is 450 ft (137.2 m) long with a longest span of 260 ft (79.2 m) and a deck 32 ft wide.

Who owns US 101 over Humptulips River?

It is owned by the State Highway Agency.