Structure 4825B0000000 · Snohomish County, WA

SR 203 over Drainage Overflow

Carries SR 203 over Drainage Overflow, 4.1 N King Co.

Overall conditionPoor

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

How ratings work
Decksets the rating3/9 · Serious
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT89 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 3/9 · sets the ratingSuperstructure 7/9Substructure 7/9

89 ft end to end, longest span 33 ft. Lengths and the car 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 slab bridge.

Built195472 years old
Length88.9 ft27.1 m
Daily traffic12,132counted 2023
Last inspectedJuly 2023every 24 months

Location

StateWashington
CountySnohomish
Location4.1 N King Co
CarriesSR 203
CrossesDrainage Overflow
Coordinates47.82881, -121.97028

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length88.9 ft (27.1 m)
Max Span33.1 ft (10.1 m)
Deck Width34.1 ft (10.4 m)
Deck Area281.8 sq m
Main Spans3
Year Built1954

Traffic

Avg Daily Traffic12,132 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical3 — Scour critical
Structure Number0004825B0000000

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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