Structure 11964A0000000 · Jefferson County, WA

SR 104 Westhalf over Hood Canal

Carries SR 104 Westhalf over Hood Canal, 13.7 E Jct US 101.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 3 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating3/9 · Serious
Substructure4/9 · Poor
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT3,750 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 3/9 · sets the ratingSubstructure 4/9

3,750 ft end to end: about 10 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 bridge of this kind.

Built1982rebuilt 2009
Length3750.0 ft1,143 m
Daily traffic18,159counted 2023
Last inspectedMay 2024every 24 months

Location

StateWashington
CountyJefferson
Location13.7 E Jct US 101
CarriesSR 104 Westhalf
CrossesHood Canal
Coordinates47.86566, -122.63471

Physical Characteristics

MaterialPrestressed Concrete
DesignOther
Total Length3750.0 ft (1,143 m)
Max Span3750.0 ft (1,143 m)
Deck Width42.7 ft (13 m)
Deck Area14,859 sq m
Main Spans1
Year Built1982 (reconstructed 2009)

Traffic

Avg Daily Traffic18,159 (2023)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number0011964A0000000

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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