Structure 88041000000000 · Snohomish County, WA

Sauk Prairie RD over Sauk River

Carries Sauk Prairie RD over Sauk River, 0.7 NE Jct SR 530.

Overall conditionGood

Set by its lowest-rated component: Superstructure and Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT472 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9 · sets the ratingSubstructure 7/9 · sets the rating

472 ft end to end, longest span 262 ft: about 7 semi-trucks nose to tail. 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.

Built200818 years old
Length472.1 ft143.9 m
Daily traffic801counted 2018
Last inspectedJune 2024every 24 months

Location

StateWashington
CountySnohomish
Location0.7 NE Jct SR 530
CarriesSauk Prairie RD
CrossesSauk River
Coordinates48.26190, -121.59472

Physical Characteristics

MaterialSteel Continuous
DesignTruss - Thru
Total Length472.1 ft (143.9 m)
Max Span262.5 ft (80 m)
Deck Width41.3 ft (12.6 m)
Deck Area1813.1 sq m
Main Spans2
Year Built2008

Traffic

Avg Daily Traffic801 (2018)
Truck Traffic17%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number088041000000000

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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