Structure 5956A0000000 · Okanogan County, WA

SR 20 over Okanogan River

Carries SR 20 over Okanogan River, 0.2 E Jct SR 215.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT368 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

368 ft end to end, longest span 89 ft: about 5 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 box-beam bridge.

Built195967 years old
Length368.1 ft112.2 m
Daily traffic2,479counted 2023
Last inspectedMarch 2023every 24 months

Location

StateWashington
CountyOkanogan
Location0.2 E Jct SR 215
CarriesSR 20
CrossesOkanogan River
Coordinates48.35374, -119.59374

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length368.1 ft (112.2 m)
Max Span88.9 ft (27.1 m)
Deck Width32.5 ft (9.9 m)
Deck Area1110.8 sq m
Main Spans6
Year Built1959

Traffic

Avg Daily Traffic2,479 (2023)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number0005956A0000000

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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