US Bridges

SR 302 over Coulter CR

Fair

Mason County, Washington · 1.3 E JCT SR 3 · Structure no. 0005121A0000000

Built
1956
69 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
116 ft
6 main spans
Daily traffic
4,313
2023 count
Owner
State
State Highway Agency

About this bridge

SR 302 over Coulter CR is a wood or timber stringer/multi-beam or girder carrying SR 302 over Coulter CR in Mason County, Washington. It was built in 1956, so it is 69 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 4,313 vehicles a day, roughly 6% of them trucks, projected to reach 5,703 by 2039. The structure is 116 ft (35.4 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 302
CrossesCoulter CR
Location1.3 E JCT SR 3
RouteState Highway 302
CountyMason County
StateWashington
Coordinates47.40682, -122.81952
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadH 15
Structure length116 ft (35.4 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,313 (2023)
Projected traffic5,703 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 302 over Coulter CR built?

It was built in 1956, making it 69 years old in 2025.

What condition is SR 302 over Coulter CR 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 August 2023.

How much traffic does SR 302 over Coulter CR carry?

About 4,313 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 302 over Coulter CR?

The structure is 116 ft (35.4 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns SR 302 over Coulter CR?

It is owned by the State Highway Agency.