Structure 35C146098800130 · Klamath County, OR

Anderson RD over Irrigation Canal

Carries Anderson RD over Irrigation Canal, 013 Mi S&e Of HWY 39.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT39 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 5/9 · sets the rating

39 ft end to end, longest span 19 ft. 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 multi-beam bridge.

Built197056 years old
Length39.0 ft11.9 m
Daily traffic82counted 2020
Last inspectedFebruary 2023every 24 months

Location

StateOregon
CountyKlamath
Location013 Mi S&e Of HWY 39
CarriesAnderson RD
CrossesIrrigation Canal
Coordinates42.03857, -121.63436

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length39.0 ft (11.9 m)
Max Span19.0 ft (5.8 m)
Deck Width28.2 ft (8.6 m)
Deck Area102.3 sq m
Main Spans2
Year Built1970

Traffic

Avg Daily Traffic82 (2020)
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number35C146098800130

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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