Structure 1496A0000000 · Skagit County, WA

SR 11 over Gn Ry Colony Creek

Carries SR 11 over Gn Ry Colony Creek, 9.2 N 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 FT883 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

883 ft end to end, longest span 66 ft: about 2.5 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 tee-beam bridge.

Built193195 years old
Length882.9 ft269.1 m
Daily traffic2,472counted 2023
Last inspectedJuly 2023every 24 months

Location

StateWashington
CountySkagit
Location9.2 N Jct I-5
CarriesSR 11
CrossesGn Ry Colony Creek
Coordinates48.59806, -122.42225

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length882.9 ft (269.1 m)
Max Span65.9 ft (20.1 m)
Deck Width34.4 ft (10.5 m)
Deck Area2825.6 sq m
Main Spans18
Year Built1931

Traffic

Avg Daily Traffic2,472 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number0001496A0000000

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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