- We are back for our fourth year and we are bigger than ever! The Growler Gallop is a 10 mile race and a 5K race starting and finishing at The Famous Atwater Brewery in Downtown Detroit! The 10 mile course will take you along the riverwalk and around Belle Isle, while the 5K will use the riverwalk and loop back around just before the bridge to Belle Isle. We will have great live music, medals, food and beer for all participants. The best part is that we have the most coveted prizes around, Growlers of Atwater Beer!! To all the fast ones out there you will have a chance to win our CASH PRIZES and KEGS!!