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Alviso Dock Feasibility Study

Published on: 10/18/2018 5:10 PM
Alviso Dock 

Project Planner: Cherise Orange

Contact:​; 408-335-2228




At the August 2015 the County of Santa Clara Housing, Land Use, Environment, and Transportation (HLUET) Committee meeting, it was suggested by community members that the County pursue replacing and operating the existing boat dock at the South Bay Yacht Club (SBYC) near Alviso Marina County Park (County Park) as a public dock. HLUET directed the County of Santa Clara Parks and Recreation Department (County Parks) to undertake a feasibility study that would access the possibility of replacing the dock and would assess the potential costs to operate the new public facility.

Phase I:  County Parks hired PlaceWorks Consultant Group and TranSystems Corporation
Phase II: County Parks hired TranSystems Corporation and eTrac, Incorporated




 The potential project site is located in proximity to the intersection of Hope Street and N. Taylor Street. The existing dock is located in the Alviso Slough 0.2 miles south of the County Park and is currently operated by the SBYC; a private entity. The Slough itself is bordered by Santa Clara Valley Water District (SCVWD) Flood protection levees and wetlands that are part of the Don Edwards Wildlife Refuge.



Why a Feasibility Study?

A feasibility study is an analysis of how successfully a project can be completed, accounting for factors that affect it such as economic, technological, legal and scheduling factors. The Alviso Dock Feasibility Study analyzes the potential dock replacement project from an engineering, environmental, timing and financial point of view.

Please note the project is only in a study phase and is not a proposed or planned project. 



Study Scope

The project scope accessed by the Feasibility Study includes replacement of 128 feet of the existing dock to provide three (3) berths, and construction of approximately 600 feet of additional dock to provide approximately 15 berths, for a total of 18 berths. The scope also includes compliance with Americans with Disabilities Act (ADA) standards and other utility and landside amenities as a public-serving dock.
Phase I: Alviso Dock Feasibility Study

Phase I of the Study evaluated critical challenges to implementing the dock replacement under three (3) potential courses of action and further refines the analysis into feasibility findings. The key differences in the alternatives are related to assumptions regarding dredging requirements and responsibility, as well as management. The design assumption of the replacement dock is similar for all alternatives.
Phase II: Alviso Slough Bathymetric Survey

Dredging the slough, is one of the core issues affecting both the feasibility of the potential project and its costs. Survey data to characterize the slough, the Project area, and the Alviso Marina County Park launch ramp area were collected through the use of a combination of a Multibeam hydrographic survey and a LIDAR (Light Detection and Ranging) survey of the slough and banks. Data was processed in accordance with U.S. Army Corps of Engineers (USACE) Hydrographic Survey Manual, EM 1110-2-1003 and the National oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS) Hydrographic Surveys Specifications and Deliverables.  



Current Progress

On Thursday, November 16, 2017 County Parks provided an update on the Study to the HLUET Committee.  County Parks recommends the HLUET Committee forward a recommendation to the County Board of Supervisor to fund a $40,000 Bathymetric survey of the slough. The goal of this study would be to determine the safe navigability of the waterway for the general public, including a more detailed (100-foot intervals) assessment from Pond A8 breach to Alviso County Park launch ramp. 



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