Lost River was a tiki bar, opened on the east side of Detroit on June 8th, 2018 by owners Karen Green and Matt Mergener. The space was dominated by a vibrant black-backgrounded mural of tropical blooms along one wall by Detroit artist Ouizi. There were hanging wooden lights by Bamboo Ben, and another wall was covered with fish nets and colored "float" string lights. A menu of both classic and original tiki drinks were served in tiki mugs.

On Facebook, Lost River announced that June 18th, 2023 would be their last day open, celebrating their 5th anniversary and saying farewell to the bar with the public.

After this, there are plans for a grand re-organization of the space with a film/photography theme in mind. However, it appears they may still use the Lost River brand for merch, and for pop-up bars and to serve to-go cocktails.