Structure 18030 001700090 · Coos County, OR

County RD 17 over Larson Creek

Carries County RD 17 over Larson Creek, T24s R12w S30 Shorewood.

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 overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT141 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

141 ft end to end, longest span 48 ft. 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 slab bridge.

Built199729 years old
Length141.1 ft43 m
Daily traffic321counted 2020
Last inspectedSeptember 2024every 24 months

Location

StateOregon
CountyCoos
LocationT24s R12w S30 Shorewood
CarriesCounty RD 17
CrossesLarson Creek
Coordinates43.45794, -124.17794

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length141.1 ft (43 m)
Max Span47.9 ft (14.6 m)
Deck Width26.2 ft (8 m)
Deck Area344 sq m
Main Spans3
Year Built1997

Traffic

Avg Daily Traffic321 (2020)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number18030 001700090

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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