Structure 1976A0000000 · Okanogan County, WA

SR 153 over Methow River

Carries SR 153 over Methow River, 22.3 N Jct US 97.

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 overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT438 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

438 ft end to end, longest span 90 ft: about 6 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 tee-beam bridge.

Built193591 years old
Length438.0 ft133.5 m
Daily traffic1,578counted 2023
Last inspectedOctober 2023every 24 months

Location

StateWashington
CountyOkanogan
Location22.3 N Jct US 97
CarriesSR 153
CrossesMethow River
Coordinates48.24483, -120.11749

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length438.0 ft (133.5 m)
Max Span89.9 ft (27.4 m)
Deck Width30.2 ft (9.2 m)
Deck Area1228.2 sq m
Main Spans7
Year Built1935

Traffic

Avg Daily Traffic1,578 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical3 — Scour critical
Structure Number0001976A0000000

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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