US Bridges

W Cloquallum RD over US 101

Fair

Mason County, Washington · 4.5 S JCT SR 102 · Structure no. 0009121A0000000

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
251 ft
2 main spans
Daily traffic
1,207
2002 count
Owner
State
State Highway Agency

About this bridge

W Cloquallum RD over US 101 is a prestressed concrete continuous stringer/multi-beam or girder carrying W Cloquallum RD over US 101 in Mason County, Washington. It was built in 1972, so it is 53 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 1,207 vehicles a day, roughly 10% of them trucks, projected to reach 1,699 by 2036. The structure is 251 ft (76.5 m) long and 29 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesW Cloquallum RD
CrossesUS 101
Location4.5 S JCT SR 102
RouteCounty Highway 0
CountyMason County
StateWashington
Coordinates47.19158, -123.1158
Functional classRural Local

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.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating70 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length251 ft (76.5 m)
Longest span130 ft (39.6 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,207 (2002)
Projected traffic1,699 by 2036
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

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$3.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was W Cloquallum RD over US 101 built?

It was built in 1972, making it 53 years old in 2025.

What condition is W Cloquallum RD over US 101 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 September 2023.

How much traffic does W Cloquallum RD over US 101 carry?

About 1,207 vehicles per day (2002 count), of which roughly 10% are trucks.

How long is W Cloquallum RD over US 101?

The structure is 251 ft (76.5 m) long with a longest span of 130 ft (39.6 m) and a deck 29 ft wide.

Who owns W Cloquallum RD over US 101?

It is owned by the State Highway Agency.