Structure 3573A0000000 · Kitsap County, WA

SR 305 over Agate Passage

Carries SR 305 over Agate Passage, 6.8 N Bainbridge F/t.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,229 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 6/9

1,229 ft end to end, longest span 540 ft: about 3.4 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a through truss.

Built195076 years old
Length1229.0 ft374.6 m
Daily traffic21,431counted 2023
Last inspectedFebruary 2023every 24 months

Location

StateWashington
CountyKitsap
Location6.8 N Bainbridge F/t
CarriesSR 305
CrossesAgate Passage
Coordinates47.71153, -122.56382

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length1229.0 ft (374.6 m)
Max Span540.0 ft (164.6 m)
Deck Width34.1 ft (10.4 m)
Deck Area3895.8 sq m
Main Spans3
Year Built1950

Traffic

Avg Daily Traffic21,431 (2023)
Truck Traffic5%
Lanes On Bridge2
Lanes Under Bridge1

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical5 — Stable for scour
Structure Number0003573A0000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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