US Bridges

US 101 over Salmon CR

Fair

Grays Harbor County, Washington · 0.6 N Pacific CO · Structure no. 0005101A0000000

Built
1929
96 years old, rebuilt 1956
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
76 ft
3 main spans
Daily traffic
4,290
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Salmon CR is a concrete continuous tee beam carrying US 101 over Salmon CR in Grays Harbor County, Washington. It was built in 1929 and reconstructed in 1956, so it is 96 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 4,290 vehicles a day, roughly 14% of them trucks, projected to reach 5,222 by 2039. The structure is 76 ft (23.2 m) long and 40 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesUS 101
CrossesSalmon CR
Location0.6 N Pacific CO
RouteU.S. Route 101
CountyGrays Harbor County
StateWashington
Coordinates46.79875, -123.74606
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length76 ft (23.2 m)
Longest span28 ft (8.5 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,290 (2023)
Projected traffic5,222 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Salmon CR built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1956.

What condition is US 101 over Salmon CR 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 August 2023.

How much traffic does US 101 over Salmon CR carry?

About 4,290 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 101 over Salmon CR?

The structure is 76 ft (23.2 m) long with a longest span of 28 ft (8.5 m) and a deck 40 ft wide.

Who owns US 101 over Salmon CR?

It is owned by the State Highway Agency.