Structure 3C0116 · Modoc County, CA

Blue Lake Road over South Fork Pit River

Carries Blue Lake Road over South Fork Pit River, 0.06 Mi S Jess Valley RD.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT198 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

198 ft end to end, longest span 46 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.

Built195769 years old
Length197.8 ft60.3 m
Daily traffic60counted 2012
Last inspectedApril 2023every 24 months

Location

StateCalifornia
CountyModoc
Location0.06 Mi S Jess Valley RD
CarriesBlue Lake Road
CrossesSouth Fork Pit River
Coordinates41.23469, -120.33857

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length197.8 ft (60.3 m)
Max Span45.9 ft (14 m)
Deck Width25.9 ft (7.9 m)
Deck Area476.4 sq m
Main Spans6
Year Built1957

Traffic

Avg Daily Traffic60 (2012)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number03C0116

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.

Nearby Bridges