US Bridges

SR 308 over Dogfish Bay

Good

Kitsap County, Washington · 3.1 E JCT SR 3 · Structure no. 0012055A0000000

Built
1981
44 years old
Condition
Good
inspected July 2022
Type
Slab
Prestressed Concrete
Length
90 ft
3 main spans
Daily traffic
4,801
2023 count
Owner
State
State Highway Agency

About this bridge

SR 308 over Dogfish Bay is a prestressed concrete slab carrying SR 308 over Dogfish Bay in Kitsap County, Washington. It was built in 1981, so it is 44 years old, younger 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 4,801 vehicles a day, roughly 3% of them trucks, projected to reach 7,527 by 2039. The structure is 90 ft (27.4 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 308
CrossesDogfish Bay
Location3.1 E JCT SR 3
RouteState Highway 308
CountyKitsap County
StateWashington
Coordinates47.69924, -122.62832
Functional classUrban Minor Arterial

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 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,801 (2023)
Projected traffic7,527 by 2039
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 308 over Dogfish Bay built?

It was built in 1981, making it 44 years old in 2025.

What condition is SR 308 over Dogfish Bay 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 2022.

How much traffic does SR 308 over Dogfish Bay carry?

About 4,801 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is SR 308 over Dogfish Bay?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 39 ft wide.

Who owns SR 308 over Dogfish Bay?

It is owned by the State Highway Agency.