Boating town guide
Discovery Bay
Discovery Bay, Contra Costa County, CA
Overview
Discovery Bay is an unincorporated waterfront community in eastern Contra Costa County, next to Highway 4. It was built in the 1960s on the Byron Tract, a former barley and potato farm, as a network of man-made waterways and residential islands. The 2020 census counted about 15,000 residents. Most homes have a private dock with boat access to the Sacramento-San Joaquin Delta, so boating is part of daily life here.
On the water
The community is run by the Town of Discovery Bay Community Services District, which says its boaters can reach more than 1,200 miles of Delta waterways and travel all the way to San Francisco Bay. Residents fish, water ski and wakeboard, and cruise to Delta destinations such as Bethel Island, Franks Tract and Antioch.
Marina and services
The public marina is Discovery Bay Marina (formerly Discovery Bay Yacht Harbor) at 5901 Marina Road. It offers wet slips, secure dry boat storage with a forklift service, guest slip booking and a launch ramp, plus the Marina Bar & Grill. The marina lists daily office hours from 8 a.m. to 5 p.m., with the launch ramp open until 7 p.m. Friday to Sunday. Lazy M Marina is also listed nearby.
Before you go
Residential canals have slow speed limits and many docks, so watch your wake. Golden mussels were found in the Delta in 2024, so clean, drain and dry your boat after each trip.
Getting there & access
By land
Discovery Bay is on Highway 4 in eastern Contra Costa County, about 60 miles from San Francisco. The marina is at 5901 Marina Road.
Launch ramp
Discovery Bay Marina lists a launch ramp with hours of 8 a.m. to 5 p.m. Monday to Thursday and 8 a.m. to 7 p.m. Friday to Sunday. Forklift service for dry storage ends at 4:30 p.m. on weekdays and 6:30 p.m. on weekends. Call the marina at (925) 634-5928 to confirm.
Guest slips
The marina takes guest slip bookings through its website or by phone. Ask about slip length limits when booking.
On the water
From Discovery Bay you reach the central Delta channels. Watch for tide and current in the open channels, and keep to no-wake speeds near docks and in canals.
Amenities
- Discovery Bay Marina — Wet slips, secure dry storage, launch ramp, guest slips; listed by State Parks as marina, launch and dry storage with public access
- Marina Bar & Grill — On-site restaurant at the marina
- Lazy M Marina — Additional marina listed in the Discovery Bay area
- Private residential docks — Most homes along the canals have their own docks with Delta access
- Country club and golf — Discovery Bay Country Club has a championship golf course
Rules & official resources
- California Boater Card required for all operators of motorized vessels, regardless of age, since January 1, 2025
- 5 mph maximum within 200 feet of a swim beach, swim float, or dock or launch float in use, and within 100 feet of bathers
- Vessels under 26 feet with an engine must have an engine cut-off switch, and the operator must wear the lanyard when above 5 mph
- Clean, drain and dry boats, trailers and gear after each outing; golden mussels were found in the Delta in October 2024
- Contra Costa Sheriff's Marine Services Unit: (925) 427-8507; call 911 for emergencies
Common boat service needs here
Dock-side detailing
Many Discovery Bay boats stay at private docks, where washing, waxing and cleaning can be done in place.
Find Boat Detailing & Washing providers →Hull cleaning
Boats in warm freshwater canals pick up growth quickly. Diver cleaning keeps the hull and running gear clear.
Find Bottom Cleaning, Hull Cleaning & Dive Services providers →Wakeboard and ski boat engine service
Heavy summer use means regular engine, impeller and ballast-pump service for towboats.
Find Marine Mechanics & Engine Service providers →Canvas and upholstery
Hot Delta summers fade and crack canvas covers and seat vinyl.
Find Canvas, Covers & Upholstery providers →Guides & FAQs
Nearby providers
No providers listed near this location yet — check back soon.
Sources
Last verified October 2, 2026