Structure 51156000001028 · Plumas County, CA

Road 24n28 over Slate Creek

Carries Road 24n28 over Slate Creek, Slate Creek.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 2 of 9.

How ratings work
Deck5/9 · Fair
Superstructure6/9 · Satisfactory
Substructuresets the rating2/9 · Critical
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT49 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 6/9Substructure 2/9 · sets the rating

49 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 girder bridge.

Built1956rebuilt 1987
Length48.9 ft14.9 m
Daily traffic501 lanes
Last inspectedSeptember 2024every 12 months

Location

StateCalifornia
CountyPlumas
LocationSlate Creek
CarriesRoad 24n28
CrossesSlate Creek
Coordinates39.93572, -121.01999

Physical Characteristics

MaterialSteel
DesignGirder and Floorbeam
Total Length48.9 ft (14.9 m)
Max Span46.9 ft (14.3 m)
Deck Width14.1 ft (4.3 m)
Deck Area64.1 sq m
Main Spans1
Year Built1956 (reconstructed 1987)

Traffic

Avg Daily Traffic50
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical2 — Bridge closed (monitoring)
Structure Number051156000001028

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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