US Bridges

Harkins Slough RD over W. Branch Struve Slough

Good

Santa Cruz County, California · Just S of HWY 1 on Ramp · Structure no. 36C0162

Built
2005
20 years old
Condition
Good
inspected May 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
424 ft
5 main spans
Daily traffic
5,000
2014 count
Owner
County
County Highway Agency

About this bridge

Harkins Slough RD over W. Branch Struve Slough is a prestressed concrete box beam or girders - multiple carrying Harkins Slough RD over W. Branch Struve Slough in Santa Cruz County, California. It was built in 2005, so it is 20 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,000 vehicles a day, roughly 4% of them trucks, projected to reach 8,438 by 2042. The structure is 424 ft (129.1 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesHarkins Slough RD
CrossesW. Branch Struve Slough
LocationJust S of HWY 1 on Ramp
RouteCounty Highway 0
Coordinates36.91336, -121.78904
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length424 ft (129.1 m)
Longest span94 ft (28.8 m)
Deck width41 ft (12.6 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2014)
Projected traffic8,438 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Harkins Slough RD over W. Branch Struve Slough built?

It was built in 2005, making it 20 years old in 2025.

What condition is Harkins Slough RD over W. Branch Struve Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2022.

How much traffic does Harkins Slough RD over W. Branch Struve Slough carry?

About 5,000 vehicles per day (2014 count), of which roughly 4% are trucks.

How long is Harkins Slough RD over W. Branch Struve Slough?

The structure is 424 ft (129.1 m) long with a longest span of 94 ft (28.8 m) and a deck 41 ft wide.

Who owns Harkins Slough RD over W. Branch Struve Slough?

It is owned by the County Highway Agency.