US Bridges

US 101 over Jorsted Creek

Fair

Mason County, Washington · 6.8 S Jefferson CO · Structure no. 0012918A0000000

Built
1985
40 years old
Condition
Fair
inspected October 2024
Type
Slab
Prestressed Concrete
Length
180 ft
3 main spans
Daily traffic
2,997
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Jorsted Creek is a prestressed concrete slab carrying US 101 over Jorsted Creek in Mason County, Washington. It was built in 1985, so it is 40 years old, younger 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 2,997 vehicles a day, roughly 20% of them trucks, projected to reach 3,502 by 2039. The structure is 180 ft (54.9 m) long and 44 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

Location

Open in Google Maps
CarriesUS 101
CrossesJorsted Creek
Location6.8 S Jefferson CO
RouteU.S. Route 101
CountyMason County
StateWashington
Coordinates47.52619, -123.05056
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20 + Mod
Structure length180 ft (54.9 m)
Longest span60 ft (18.3 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,997 (2023)
Projected traffic3,502 by 2039
Trucks20%
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$2.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Jorsted Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is US 101 over Jorsted 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 October 2024.

How much traffic does US 101 over Jorsted Creek carry?

About 2,997 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is US 101 over Jorsted Creek?

The structure is 180 ft (54.9 m) long with a longest span of 60 ft (18.3 m) and a deck 44 ft wide.

Who owns US 101 over Jorsted Creek?

It is owned by the State Highway Agency.