Structure 10C0032 · Mendocino County, CA

Philo Greenwood RD over Navarro River

Carries Philo Greenwood RD over Navarro River, 0.4 Mi W Of SR 128.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT352 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

352 ft end to end, longest span 132 ft: about 5 semi-trucks nose to tail. 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 deck arch.

Built1949rebuilt 1951
Length352.0 ft107.3 m
Daily traffic418counted 2014
Last inspectedFebruary 2024every 24 months

Location

StateCalifornia
CountyMendocino
Location0.4 Mi W Of SR 128
CarriesPhilo Greenwood RD
CrossesNavarro River
Coordinates39.08553, -123.48488

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length352.0 ft (107.3 m)
Max Span132.2 ft (40.3 m)
Deck Width18.7 ft (5.7 m)
Deck Area611.6 sq m
Main Spans3
Year Built1949 (reconstructed 1951)

Traffic

Avg Daily Traffic418 (2014)
Truck Traffic5%
Lanes On Bridge1

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number10C0032

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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