Structure 31C48 726 00039 · Jefferson County, OR

Norris Lane over Irrigation Canal

Carries Norris Lane over Irrigation Canal, 0.4 Mi W Of HWY 97.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating4/9 · Poor
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT116 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 6/9

116 ft end to end, longest span 29 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.

Built1950rebuilt 1970
Length116.1 ft35.4 m
Daily traffic44counted 2020
Last inspectedNovember 2024every 12 months

Location

StateOregon
CountyJefferson
Location0.4 Mi W Of HWY 97
CarriesNorris Lane
CrossesIrrigation Canal
Coordinates44.44825, -121.20733

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length116.1 ft (35.4 m)
Max Span28.9 ft (8.8 m)
Deck Width24.0 ft (7.3 m)
Deck Area258.4 sq m
Main Spans4
Year Built1950 (reconstructed 1970)

Traffic

Avg Daily Traffic44 (2020)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number31C48 726 00039

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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