Structure 12C0124 · Butte County, CA

Cohasset RD over Mud Creek

Carries Cohasset RD over Mud Creek, 0.1 Mi S Rchardsn Sprg RD.

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 overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT70 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

70 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 tee-beam bridge.

Built196264 years old
Length70.2 ft21.4 m
Daily traffic2,148counted 2019
Last inspectedJuly 2022every 48 months

Location

StateCalifornia
CountyButte
Location0.1 Mi S Rchardsn Sprg RD
CarriesCohasset RD
CrossesMud Creek
Coordinates39.81616, -121.84780

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length70.2 ft (21.4 m)
Max Span65.0 ft (19.8 m)
Deck Width32.8 ft (10 m)
Deck Area214 sq m
Main Spans1
Year Built1962

Traffic

Avg Daily Traffic2,148 (2019)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2022
Inspection FrequencyEvery 48 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number12C0124

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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