Willow Berm Marina

Willow Berm Marina & Yacht Harbor is a large Delta marina at 140 Brannan Island Road in Isleton, off Highway 12 near the Delta Loop. It sits on its own island on the Mokelumne River arm of the Sacramento-San Joaquin Delta, and access is through a security entry gate.

Slips and guest docking

The marina advertises 350 covered and uncovered slips up to 80 feet, while the state boating facilities directory lists 330 slips for boats from 18 to 80 feet. Either way, it's one of the bigger yacht harbors on this stretch of the Delta. There's 1,400 feet of guest docking for visiting boats.

Services for cruisers

The fuel dock sells diesel, gasoline and propane. A pump-out is free for members, and valet pump-out service is offered on the north side. Laundry, heated restrooms and showers, Wi-Fi and oil disposal round out the basics.

The member experience

Willow Berm feels more like a resort than a working harbor. There's a clubhouse with a fitness center, business center, kitchen and pool table, a sand beach with a fire pit and tiki hut, BBQ areas, and lawn games like bocce and horseshoes. A seasonal members' restaurant and weekend breakfasts run in summer.

Boating notes

The Delta is fresh, tidal water with summer afternoon wind. Golden mussel was confirmed in the Delta in October 2024, so clean, drain and dry every time your boat comes out.