Structure 19723 026 04604 · Clackamas County, OR

US 26 (hwy 026) over Zig Zag River

Carries US 26 (hwy 026) over Zig Zag River, 1.7 Mi E Rhododendron Po.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT87 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

87 ft end to end. Lengths and the car 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 slab bridge.

Built200521 years old
Length86.6 ft26.4 m
Daily traffic9,297counted 2022
Last inspectedMay 2023every 24 months

Location

StateOregon
CountyClackamas
Location1.7 Mi E Rhododendron Po
CarriesUS 26 (hwy 026)
CrossesZig Zag River
Coordinates45.31115, -121.88920

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length86.6 ft (26.4 m)
Max Span82.0 ft (25 m)
Deck Width60.0 ft (18.3 m)
Deck Area483.1 sq m
Main Spans1
Year Built2005

Traffic

Avg Daily Traffic9,297 (2022)
Truck Traffic17%
Lanes On Bridge3

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number19723 026 04604

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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