US Bridges

US 101 over SR 3

Fair

Mason County, Washington · 5.7 S JCT SR 102 · Structure no. 0009121B0000000

Built
1972
53 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
134 ft
1 main span
Daily traffic
17,050
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over SR 3 is a prestressed concrete stringer/multi-beam or girder carrying US 101 over SR 3 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 17,050 vehicles a day, roughly 6% of them trucks, projected to reach 23,054 by 2039. The structure is 134 ft (40.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 101
CrossesSR 3
Location5.7 S JCT SR 102
RouteU.S. Route 101
CountyMason County
StateWashington
Coordinates47.18089, -123.09917
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length134 ft (40.8 m)
Longest span130 ft (39.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,050 (2023)
Projected traffic23,054 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$2.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 101 over SR 3 built?

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

What condition is US 101 over SR 3 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 November 2023.

How much traffic does US 101 over SR 3 carry?

About 17,050 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 101 over SR 3?

The structure is 134 ft (40.8 m) long with a longest span of 130 ft (39.6 m) and a deck 43 ft wide.

Who owns US 101 over SR 3?

It is owned by the State Highway Agency.