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 & Wildlife operates a second launch on the southeast side with limited parking and a small fishing pier.

The north access point also provides additional amenities including a swimming beach, day-use parking ($10 fee), restrooms, and is one of the few Snohomish County parks that permits motorized watercraft and water skiing.