Structure 36C0166 · Santa Cruz County, CA

Harkins Slough RD over Watsonville Slough

Carries Harkins Slough RD over Watsonville Slough, West Of Ohlone Parkway.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT751 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 6/9 · sets the rating

751 ft end to end, longest span 100 ft: about 2.1 football fields. 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 box-beam bridge.

Built200818 years old
Length751.3 ft229 m
Daily traffic5,000counted 2016
Last inspectedNovember 2024every 24 months

Location

StateCalifornia
CountySanta Cruz
LocationWest Of Ohlone Parkway
CarriesHarkins Slough RD
CrossesWatsonville Slough
Coordinates36.91499, -121.78143

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length751.3 ft (229 m)
Max Span100.1 ft (30.5 m)
Deck Width86.0 ft (26.2 m)
Deck Area5999.8 sq m
Main Spans8
Year Built2008

Traffic

Avg Daily Traffic5,000 (2016)
Truck Traffic5%
Lanes On Bridge4

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number36C0166

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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