US Bridges

US 101 over Kalaloch Creek

Fair

Jefferson County, Washington · 5.8 N Grays Hbr CO · Structure no. 0001389A0000000

Built
1930
95 years old, rebuilt 1965
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete Continuous
Length
140 ft
4 main spans
Daily traffic
1,079
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Kalaloch Creek is a concrete continuous tee beam carrying US 101 over Kalaloch Creek in Jefferson County, Washington. It was built in 1930 and reconstructed in 1965, so it is 95 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 1,079 vehicles a day, roughly 23% of them trucks, projected to reach 1,831 by 2039. The structure is 140 ft (42.7 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 101
CrossesKalaloch Creek
Location5.8 N Grays Hbr CO
RouteU.S. Route 101
CountyJefferson County
StateWashington
Coordinates47.60858, -124.37239
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length140 ft (42.7 m)
Longest span44 ft (13.4 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,079 (2023)
Projected traffic1,831 by 2039
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Kalaloch Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1965.

What condition is US 101 over Kalaloch Creek 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 June 2024.

How much traffic does US 101 over Kalaloch Creek carry?

About 1,079 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is US 101 over Kalaloch Creek?

The structure is 140 ft (42.7 m) long with a longest span of 44 ft (13.4 m) and a deck 28 ft wide.

Who owns US 101 over Kalaloch Creek?

It is owned by the State Highway Agency.