US Bridges

SR 304 over Sinclair Inlet

Good

Kitsap County, Washington · 0.4 E JCT SR 303 · Structure no. 0013663B0000000

Built
1990
35 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete
Length
205 ft
4 main spans
Daily traffic
12,807
2010 count
Owner
State
State Highway Agency

About this bridge

SR 304 over Sinclair Inlet is a concrete slab carrying SR 304 over Sinclair Inlet in Kitsap County, Washington. It was built in 1990, so it is 35 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 12,807 vehicles a day, projected to reach 15,368 by 2032. The structure is 205 ft (62.5 m) long and 25 ft wide.

Location

Open in Google Maps
CarriesSR 304
CrossesSinclair Inlet
Location0.4 E JCT SR 303
RouteState Highway 304
CountyKitsap County
StateWashington
Coordinates47.56203, -122.625
Functional classUrban Other Principal 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 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 rating25 US tons
Inventory rating15 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20 + Mod
Structure length205 ft (62.5 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,807 (2010)
Projected traffic15,368 by 2032
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollToll bridge
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 304 over Sinclair Inlet built?

It was built in 1990, making it 35 years old in 2025.

What condition is SR 304 over Sinclair Inlet 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 May 2023.

How much traffic does SR 304 over Sinclair Inlet carry?

About 12,807 vehicles per day (2010 count).

How long is SR 304 over Sinclair Inlet?

The structure is 205 ft (62.5 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns SR 304 over Sinclair Inlet?

It is owned by the State Highway Agency.