Map Warren Woods Forest Preserve Elm Valley Road, Three Oaks, MI 49128 Add To Trip WebsitePhone: (269) 426-4013 Description Located on Elm Valley Road west of Three Oaks Road that is open from dawn to dusk. It is a first growth forest with trails that follow the course of the Galien River. Visitors will find abundant wildflowers and mature beach and maple trees. Videos TripAdvisor® Traveler Reviews More To Explore Categories: Outdoors Hiking Attractions Recreation City: Three Oaks Region: Southwest Although the MEDC uses reasonable efforts to maintain the accuracy of the website content, it is not represented to be error free. Read legal information.