Structure 7565M0000000 · King County, WA

Dearborn-n Ramp over I-5 Nbcd

Carries Dearborn-n Ramp over I-5 Nbcd, 0.1 N Jct I-90.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT749 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

749 ft end to end, longest span 132 ft: about 2.1 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 box-beam bridge.

Built196561 years old
Length749.0 ft228.3 m
Daily traffic6,516counted 2012
Last inspectedAugust 2024every 24 months

Location

StateWashington
CountyKing
Location0.1 N Jct I-90
CarriesDearborn-n Ramp
CrossesI-5 Nbcd
Coordinates47.59461, -122.31883

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length749.0 ft (228.3 m)
Max Span131.9 ft (40.2 m)
Deck Width25.6 ft (7.8 m)
Deck Area1780.7 sq m
Main Spans8
Year Built1965

Traffic

Avg Daily Traffic6,516 (2012)
Truck Traffic5%
Lanes On Bridge1
Lanes Under Bridge9

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007565M0000000

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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