US Bridges

US 101 over Finch Creek

Good

Mason County, Washington · 17.1 S Jefferson CO · Structure no. 0000947A0000000

Built
1925
100 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
4,585
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Finch Creek is a concrete continuous slab carrying US 101 over Finch Creek in Mason County, Washington. It was built in 1925, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,585 vehicles a day, roughly 11% of them trucks, projected to reach 5,931 by 2039. The structure is 62 ft (18.9 m) long and 36 ft wide. If it were closed, the detour would be 37.9 mi (61 km).

CarriesUS 101
CrossesFinch Creek
Location17.1 S Jefferson CO
RouteU.S. Route 101
Coordinates47.40678, -123.14049
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length62 ft (18.9 m)
Longest span20 ft (6.1 m)
Deck width36 ft (11 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,585 (2023)
Projected traffic5,931 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$825,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Finch Creek built?

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

What condition is US 101 over Finch Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does US 101 over Finch Creek carry?

About 4,585 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 101 over Finch Creek?

The structure is 62 ft (18.9 m) long with a longest span of 20 ft (6.1 m) and a deck 36 ft wide.

Who owns US 101 over Finch Creek?

It is owned by the State Highway Agency.