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Harbor guide

Oakland-Alameda Estuary

Alameda, Alameda County, CA

Overview

The Oakland-Alameda Estuary is the dredged tidal channel that separates Alameda Island from the East Bay mainland, linking San Francisco Bay on the west with San Leandro Bay on the east. It is one of the Bay's busiest mixed-use waterways. Container ships serving the Port of Oakland, tugs and ferries share a narrow channel with sailboats, powerboats and rowing crews, and it also passes Coast Guard Base Alameda and the former Naval Air Station Alameda. At Jack London Square the estuary is roughly 850 feet wide.

Marinas along the estuary

Boaters coming in from the Bay find the Alameda side lined with marinas. Mariner Square Marina and Dry Stack (about 50 wet slips for 40-150 ft boats plus a 240-boat dry stack) is the first marina in Alameda on entering the estuary. Farther up are Alameda Marina (about 530 slips and a boatyard), Grand Marina (about 400 slips, fuel and haul-out) and Marina Village Yacht Harbor (about 750 berths). On the Oakland side, Jack London Square Marina sits at the foot of Broadway. Private clubs include Encinal Yacht Club and Oakland Yacht Club.

Bridges and tubes

Two immersed highway tubes, the Posey Tube (1928) and the Webster Street Tube (1963), run beneath the channel. Three drawbridges cross it: Park Street, High Street and Miller-Sweeney (the Fruitvale Bridge). Alameda County operates them. They open on signal except Monday to Friday, 8-9 am and 4:30-6:30 pm, excluding federal holidays. Request an opening on VHF channel 9, the preferred working channel, or with a long blast followed by a short blast. Channel 16 is for hailing and distress.

Traffic, speed and anchoring

Keep a sharp lookout for container ships, tugs and ferries, and stay clear of the Oakland Alameda Water Shuttle crossing at Jack London Square. State law caps speed at 5 mph within 200 feet of any floating dock or marina. Oakland has a nuisance-vessel ordinance aimed at illegally anchored, inhabited boats in the estuary, and enforcement has been limited. Expect derelict boats, anchor-outs and dinghy theft. Don't count on anchoring here; use a slip or guest dock.

Getting there & access

Entering from the Bay

The approach follows the red buoy line into Oakland Harbor starting with buoy 2 per a local cruising guide. The estuary is narrow but has deep water to within a boat length of the sides. Container ships, tugs and ferries use the channel, so keep a good lookout.

Drawbridges and VHF

Park Street, High Street and Miller-Sweeney open on signal outside the weekday commute restrictions (8-9 am and 4:30-6:30 pm Mon-Fri, excluding federal holidays). Vessels that need an opening during a restricted period for tide or slack water must give 2 hours' notice. Hail on VHF 9. Bridge phones: Park Street (510) 522-7282, High Street (510) 533-1126, Miller-Sweeney (510) 533-7858.

Visiting by boat

Grand Marina and Jack London Square Marina take transient reservations online, and California Parks lists transient berths at Marina Village and Alameda Marina. Call ahead for availability and rates.

Launching

Alameda's Encinal Boat Ramp (150 Central Avenue) is a two-lane ramp with a motorized and a non-motorized dock. California Parks also lists a Grand Street launch facility at the north end of Grand Street. Check with the City of Alameda for hours and fees.

By road and ferry

The Posey and Webster Street Tubes link Oakland and Alameda, and Park Street, High Street and Miller-Sweeney bridges cross at the upper estuary. The Oakland Alameda Water Shuttle connects Jack London Square and Alameda Landing across the estuary, and San Francisco Bay Ferry serves Alameda's Main Street and Seaplane Lagoon terminals.

Amenities

  • Grand Marina — 2099 Grand Street; about 400 slips, fuel sales, pump-out, haul-out and repair, showers, laundry, 2 transient floats; (510) 865-1200
  • Marina Village Yacht Harbor — 1030 Marina Village Pkwy; about 750 berths for 28-72 ft boats, transient berths, pump-out, restaurant; (510) 521-0905
  • Alameda Marina — 1815 Clement Ave; about 530 slips, boat washdown, haul-out and repair, transient berths; (510) 521-1133
  • Mariner Square Dry Stack — 240-boat dry stack (to 38 ft and 18,000 lb) plus about 50 wet slips for 40-150 ft boats
  • Jack London Square Marina — 38 Webster Street, Oakland; transient slips, fuel dock, pump-out, showers, Wi-Fi; (510) 834-4591
  • Yacht clubs — Encinal Yacht Club, Aeolian Yacht Club and Oakland Yacht Club (private)
  • Water shuttle — Oakland Alameda Water Shuttle between Jack London Square and Alameda Landing

Rules & official resources

Common boat service needs here

Bottom cleaning and antifouling

Boats kept in estuary slips grow marine fouling year-round. Divers keep hulls and running gear clean, and the area's yards haul out for bottom paint.

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Haul-out and boatyard work

Alameda Marina and Grand Marina list haul-out and repair, so repaints, zinc changes and running-gear work usually go there rather than into the slip.

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Dry-stack and storage logistics

Mariner Square runs a 240-boat dry stack, and several estuary marinas offer dry storage, so owners often need boat-handling and storage services.

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Security and electronics

Reports of dinghy and equipment theft from estuary marinas make locks, tracking and camera systems a common electronics request.

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Pre-purchase surveys

Grand Marina hosts on-site yacht brokers and the estuary has a large slip market, so buyers regularly order surveys before closing.

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Guides & FAQs

Nearby providers

No providers listed near this location yet — check back soon.

Sources

Last verified October 2, 2026