Structure 17 0076R · Nevada County, CA

Interstate 80 EB over Donner Lake Road

Carries Interstate 80 EB over Donner Lake Road, 03-nev-080-r9.01r.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT151 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

151 ft end to end, longest span 50 ft: about 2 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.

Built1963rebuilt 1991
Length151.2 ft46.1 m
Daily traffic27,000counted 2020
Last inspectedAugust 2024every 24 months

Location

StateCalifornia
CountyNevada
Location03-nev-080-r9.01r
CarriesInterstate 80 EB
CrossesDonner Lake Road
Coordinates39.33089, -120.28926

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length151.2 ft (46.1 m)
Max Span49.9 ft (15.2 m)
Deck Width54.5 ft (16.6 m)
Deck Area765.3 sq m
Main Spans3
Year Built1963 (reconstructed 1991)

Traffic

Avg Daily Traffic27,000 (2020)
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number17 0076R

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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