Structure 6968A0000000 · King County, WA

61st AVE S over I-405

Carries 61st AVE S over I-405, 0.3 N Jct I-5.

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 FT205 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

205 ft end to end, longest span 101 ft: about 3 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 multi-beam bridge.

Built1962rebuilt 1968
Length205.1 ft62.5 m
Daily traffic31,000counted 2012
Last inspectedApril 2024every 24 months

Location

StateWashington
CountyKing
Location0.3 N Jct I-5
Carries61st AVE S
CrossesI-405
Coordinates47.46297, -122.25822

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length205.1 ft (62.5 m)
Max Span101.0 ft (30.8 m)
Deck Width65.6 ft (20 m)
Deck Area1,250 sq m
Main Spans2
Year Built1962 (reconstructed 1968)

Traffic

Avg Daily Traffic31,000 (2012)
Truck Traffic3%
Lanes On Bridge4
Lanes Under Bridge8

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0006968A0000000

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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