US Bridges

SR 3 over Mill Creek

Fair

Mason County, Washington · 0.9 N JCT US 101 · Structure no. 0000451A0000000

Built
1921
104 years old, rebuilt 1966
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
15,354
2023 count
Owner
State
State Highway Agency

About this bridge

SR 3 over Mill Creek is a concrete continuous tee beam carrying SR 3 over Mill Creek in Mason County, Washington. It was built in 1921 and reconstructed in 1966, so it is 104 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 15,354 vehicles a day, roughly 8% of them trucks, projected to reach 19,717 by 2039. The structure is 129 ft (39.3 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 3
CrossesMill Creek
Location0.9 N JCT US 101
RouteState Highway 3
CountyMason County
StateWashington
Coordinates47.19297, -123.0989
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating20 US tons
Inventory rating15.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length129 ft (39.3 m)
Longest span81 ft (24.7 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,354 (2023)
Projected traffic19,717 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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$2.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 3 over Mill Creek built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1966.

What condition is SR 3 over Mill 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 May 2023.

How much traffic does SR 3 over Mill Creek carry?

About 15,354 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 3 over Mill Creek?

The structure is 129 ft (39.3 m) long with a longest span of 81 ft (24.7 m) and a deck 34 ft wide.

Who owns SR 3 over Mill Creek?

It is owned by the State Highway Agency.