US Bridges

SR 101 over Cushman Tailrace

Fair

Mason County, Washington · 19.9 S Jefferson CO · Structure no. 0001350A0000000

Built
1930
95 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
71 ft
2 main spans
Daily traffic
7,356
2023 count
Owner
State
State Highway Agency

About this bridge

SR 101 over Cushman Tailrace is a concrete continuous tee beam carrying SR 101 over Cushman Tailrace in Mason County, Washington. It was built in 1930, 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 7,356 vehicles a day, roughly 11% of them trucks, projected to reach 9,760 by 2039. The structure is 71 ft (21.6 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 101
CrossesCushman Tailrace
Location19.9 S Jefferson CO
RouteU.S. Route 101
CountyMason County
StateWashington
Coordinates47.36987, -123.15945
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 protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating35.7 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length71 ft (21.6 m)
Longest span36 ft (11 m)
Deck width37 ft (11.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,356 (2023)
Projected traffic9,760 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$944,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 101 over Cushman Tailrace built?

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

What condition is SR 101 over Cushman Tailrace 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 2023.

How much traffic does SR 101 over Cushman Tailrace carry?

About 7,356 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SR 101 over Cushman Tailrace?

The structure is 71 ft (21.6 m) long with a longest span of 36 ft (11 m) and a deck 37 ft wide.

Who owns SR 101 over Cushman Tailrace?

It is owned by the State Highway Agency.