Structure 50 0207 · Kern County, CA

State Route 99 over Poso Creek Overflow

Carries State Route 99 over Poso Creek Overflow, 06-ker-099-45.49.

Overall conditionGood

Set by its lowest-rated component: Culvert at 7 of 9.

How ratings work
Culvertsets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT35 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 7/9

A culvert 35 ft across with 4 openings. 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, so those are drawn as typical for a culvert.

Built1951rebuilt 1970
Length35.1 ft10.7 m
Daily traffic51,000counted 2009
Last inspectedMarch 2024every 24 months

Location

StateCalifornia
CountyKern
Location06-ker-099-45.49
CarriesState Route 99
CrossesPoso Creek Overflow
Coordinates35.61910, -119.21309

Physical Characteristics

MaterialConcrete Continuous
DesignCulvert
Total Length35.1 ft (10.7 m)
Max Span8.9 ft (2.7 m)
Deck Width154.2 ft (47 m)
Deck Area502.9 sq m
Main Spans4
Year Built1951 (reconstructed 1970)

Traffic

Avg Daily Traffic51,000 (2009)
Truck Traffic27%
Lanes On Bridge6

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number50 0207

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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