Structure 10F0013 · Mendocino County, CA

Forest Road 200 over Chamberlain Creek

Carries Forest Road 200 over Chamberlain Creek, 1.0 Mi N Jct SR 20.

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
CAR · 15 FT31 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

31 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 slab bridge.

Built1958rebuilt 2021
Length31.5 ft9.6 m
Daily traffic75counted 2009
Last inspectedMay 2023every 24 months

Location

StateCalifornia
CountyMendocino
Location1.0 Mi N Jct SR 20
CarriesForest Road 200
CrossesChamberlain Creek
Coordinates39.36362, -123.56189

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length31.5 ft (9.6 m)
Max Span26.9 ft (8.2 m)
Deck Width16.1 ft (4.9 m)
Deck Area47.0 sq m
Main Spans1
Year Built1958 (reconstructed 2021)

Traffic

Avg Daily Traffic75 (2009)
Lanes On Bridge1

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Park/Forest Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number10F0013

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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