US Bridges

US 101 over Sund Creek

Fair

Mason County, Washington · 14.3 S Jefferson CO · Structure no. 0011746A0000000

Built
1925
100 years old, rebuilt 1980
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
3,766
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Sund Creek is a concrete slab carrying US 101 over Sund Creek in Mason County, Washington. It was built in 1925 and reconstructed in 1980, so it is 100 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 3,766 vehicles a day, roughly 11% of them trucks, projected to reach 5,134 by 2039. The structure is 23 ft (7 m) long and 39 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesUS 101
CrossesSund Creek
Location14.3 S Jefferson CO
RouteU.S. Route 101
CountyMason County
StateWashington
Coordinates47.44036, -123.11978
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,766 (2023)
Projected traffic5,134 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 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$415,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Sund Creek built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1980.

What condition is US 101 over Sund 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 September 2023.

How much traffic does US 101 over Sund Creek carry?

About 3,766 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 101 over Sund Creek?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 39 ft wide.

Who owns US 101 over Sund Creek?

It is owned by the State Highway Agency.