Structure 80128000000000 · Snohomish County, WA

Lowell-snoh Riv RD over Marshland Flood Canal

Carries Lowell-snoh Riv RD over Marshland Flood Canal, 0.9 E Jct I-5.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT143 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

143 ft end to end, longest span 26 ft. 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 tee-beam bridge.

Built196363 years old
Length142.7 ft43.5 m
Daily traffic5,544counted 2022
Last inspectedJune 2023every 24 months

Location

StateWashington
CountySnohomish
Location0.9 E Jct I-5
CarriesLowell-snoh Riv RD
CrossesMarshland Flood Canal
Coordinates47.94644, -122.18006

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length142.7 ft (43.5 m)
Max Span26.2 ft (8 m)
Deck Width34.1 ft (10.4 m)
Deck Area452.4 sq m
Main Spans6
Year Built1963

Traffic

Avg Daily Traffic5,544 (2022)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number080128000000000

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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