US Bridges

US 101 over Hoquiam River

PoorPosted for load

Grays Harbor County, Washington · 3.3 N JCT US 12 · Structure no. 0001084A0000000

Built
1928
97 years old, rebuilt 1948
Condition
Poor
inspected May 2023
Type
Movable - Bascule
Steel
Length
1,980 ft
1 main span
Daily traffic
12,765
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Hoquiam River is a steel movable - bascule carrying US 101 over Hoquiam River in Grays Harbor County, Washington. It was built in 1928 and reconstructed in 1948, so it is 97 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 12,765 vehicles a day, roughly 6% of them trucks, projected to reach 14,672 by 2039. The structure is 1,980 ft (603.5 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 101
CrossesHoquiam River
Location3.3 N JCT US 12
RouteU.S. Route 101
Coordinates46.97537, -123.87334
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.6 US tons
Inventory rating15 US tons

Structure

Structure typeMovable - Bascule
MaterialSteel
DeckOpen grating
Main spans1 (+86 approach)
Design loadH 20
Structure length1,980 ft (603.5 m)
Longest span200 ft (61 m)
Deck width26 ft (7.8 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck17 ft (5 m)

Traffic and service

Average daily traffic12,765 (2023)
Projected traffic14,672 by 2039
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$34.8 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 101 over Hoquiam River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1948.

What condition is US 101 over Hoquiam River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does US 101 over Hoquiam River carry?

About 12,765 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 101 over Hoquiam River?

The structure is 1,980 ft (603.5 m) long with a longest span of 200 ft (61 m) and a deck 26 ft wide.

Who owns US 101 over Hoquiam River?

It is owned by the State Highway Agency.