Hi, thank you for your interest in the Accretion Beach.  This is the name given to it by the Grosse Pointe News newspaper.  It is a sandy beach that has had some controversy in recent years.  The homeowners across the street set fire (probably illegally) to the wild grasses which got too tall and blocked their view of the lake.  The beach attracts a lot of visitors because it is outside of the park and no park pass is required.  The city once considered adding a side gate to the park so that park visitors could access the beach without walking around through the main gate, but never did.  The water level varies seasonally and yearly so the beach can be very large or very small depending on when the aerial photo was taken.