The RV park at the Casino has a dump station for a fee. It's just down the road at Bay Mills Casino. They also have a laundry. We decided to stay one night there to use both.

Brinkley State Park about 7 miles away has the best set up for dumping. Cost is $10.00 There is a free spot closer next to a park and athletic field Bay Mills park?. Okay for dumping but not the best set up for rinsing your tank.

Apparently the dump station at Bay Mills Riverview Campground is open to the public. Pay $5 at the AOP store to access. Might call in advance too verify hours.