Structure 51151000001153 · Plumas County, CA

21n10 In L.b. Cg over Gray Eagle Ck

Carries 21n10 In L.b. Cg over Gray Eagle Ck, Within Campground.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
25 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

25 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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.

Built199531 years old
Length24.9 ft7.6 m
Daily traffic501 lanes
Last inspectedSeptember 2023every 24 months

Location

StateCalifornia
CountyPlumas
LocationWithin Campground
Carries21n10 In L.b. Cg
CrossesGray Eagle Ck
Coordinates39.69862, -120.66512

Physical Characteristics

MaterialWood or Timber
DesignGirder and Floorbeam
Total Length24.9 ft (7.6 m)
Max Span24.9 ft (7.6 m)
Deck Width16.1 ft (4.9 m)
Deck Area37.2 sq m
Main Spans1
Year Built1995

Traffic

Avg Daily Traffic50
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number051151000001153

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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