Representative Project

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Delta Coves



Client: SunCal Companies


This waterfront community located on Bethel Island in the Sacramento-San Joaquin Delta in eastern Contra Costa County is one of the most unique master planned projects in the area. This 310-acre parcel, currently under development by SunCal Companies, will encompass 590 waterfront homes situated along a man-made lagoon that will provide residents with deep-water access to thousands of miles of Delta waterways and the San Francisco Bay. The community will also feature condominiums, a yacht club, and commercial and recreational facilities.

RJA provided civil engineering and related services for development of the improvement plans and the design of the 2 ½ mile levee and finger peninsulas, finished grading, sewer, water and storm drainage facilities and roadways. RJA was also part of the team that developed the seepage control system that included a slurry wall and a groundwater control system.

A unique challenge in the development of this project involved breaching 200 feet of levee to provide boat access to the lagoon. In order to do this, the lagoon was filled with water using multiple pipes through the existing levee. Once the water level in the lagoon and the delta equalized, the existing levee was removed. The breach now serves as a levee maintenance road and an emergency escape route.

At project completion, there will be a total of 494 single family residences, with most having a private boat dock, 100 condominiums, a 12,000 square foot yacht club, a marina with 150 boat slips, a recreation center and commercial facilities.