Structure 33 0272K · Alameda County, CA

S880-mowry AVE Off over Hetch Hetchy Aqueduct

Carries S880-mowry AVE Off over Hetch Hetchy Aqueduct, 04-ala-880-7.34-nwk.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT101 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

101 ft end to end, longest span 20 ft. 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 or the layout of the shorter spans, so those are drawn as typical for a slab bridge.

Built199432 years old
Length100.7 ft30.7 m
Daily traffic18,200counted 2017
Last inspectedApril 2023every 48 months

Location

StateCalifornia
CountyAlameda
Location04-ala-880-7.34-nwk
CarriesS880-mowry AVE Off
CrossesHetch Hetchy Aqueduct
Coordinates37.53079, -122.00469

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length100.7 ft (30.7 m)
Max Span19.7 ft (6 m)
Deck Width26.2 ft (8 m)
Deck Area245.6 sq m
Main Spans5
Year Built1994

Traffic

Avg Daily Traffic18,200 (2017)
Truck Traffic11%
Lanes On Bridge1

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number33 0272K

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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