Structure 16C0001 · Yuba County, CA

Simpson LN over Yuba River

Carries Simpson LN over Yuba River, 0.5 Mi Se/o E 10th ST.

Overall conditionPoor

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

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating4/9 · Poor
Channelnot part of overall3/9 · Serious
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT417 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 4/9 · sets the rating

417 ft end to end, longest span 83 ft: about 6 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 tee-beam bridge.

Built1957rebuilt 1987
Length417.0 ft127.1 m
Daily traffic11,630counted 2007
Last inspectedAugust 2024every 24 months

Location

StateCalifornia
CountyYuba
Location0.5 Mi Se/o E 10th ST
CarriesSimpson LN
CrossesYuba River
Coordinates39.14203, -121.57706

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length417.0 ft (127.1 m)
Max Span83.0 ft (25.3 m)
Deck Width43.6 ft (13.3 m)
Deck Area1690.4 sq m
Main Spans5
Year Built1957 (reconstructed 1987)

Traffic

Avg Daily Traffic11,630 (2007)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number16C0001

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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