Structure 10C0046 · Mendocino County, CA

Gualala Road over North Fork Gualala River

Carries Gualala Road over North Fork Gualala River, 2 Mi E Jct SR 1.

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 overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT187 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 5/9Substructure 4/9 · sets the rating

187 ft end to end: about 3 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 through truss.

Built194086 years old
Length187.0 ft57 m
Daily traffic97counted 2011
Last inspectedMay 2023every 24 months

Location

StateCalifornia
CountyMendocino
Location2 Mi E Jct SR 1
CarriesGualala Road
CrossesNorth Fork Gualala River
Coordinates38.77910, -123.49950

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length187.0 ft (57 m)
Max Span129.9 ft (39.6 m)
Deck Width12.8 ft (3.9 m)
Deck Area222.3 sq m
Main Spans1
Year Built1940

Traffic

Avg Daily Traffic97 (2011)
Truck Traffic10%
Lanes On Bridge1

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical3 — Scour critical
Structure Number10C0046

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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