Structure 14C0048 · Lake County, CA

Chalk Mtn RD over North Fork Cache Creek

Carries Chalk Mtn RD over North Fork Cache Creek, In Spring Valley Lake Dev.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure5/9 · Fair
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT209 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 5/9Substructure 7/9

209 ft end to end, longest span 42 ft: 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 multi-beam bridge.

Built196759 years old
Length209.0 ft63.7 m
Daily traffic15counted 2016
Last inspectedNovember 2024every 12 months

Location

StateCalifornia
CountyLake
LocationIn Spring Valley Lake Dev
CarriesChalk Mtn RD
CrossesNorth Fork Cache Creek
Coordinates39.06981, -122.58444

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length209.0 ft (63.7 m)
Max Span42.0 ft (12.8 m)
Deck Width16.1 ft (4.9 m)
Deck Area312.1 sq m
Main Spans5
Year Built1967

Traffic

Avg Daily Traffic15 (2016)
Lanes On Bridge1

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number14C0048

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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