Flowing Lake offers two public boat launch access points: Snohomish County's Flowing Lake Park at Leckie's Beach on the north end features a paved boat launch with fishing dock and ample parking, while the Washington Department of Fish and Wildlife operates a second launch on the southeast side with limited parking and a small fishing pier.

The lake is one of the few in Snohomish County that permits motorized watercraft and water skiing, making it popular for recreational boating.