According to the latest information available, the Big Cliff boat ramp in Oregon is a concrete boat ramp that is approximately 25 feet wide. It services the Detroit Lake, which is a reservoir on the North Santiam River. The water body is used for recreational purposes such as fishing, boating, and swimming. The Oregon Department of Fish and Wildlife allows motorized boats on the lake with a maximum speed limit of 35 miles per hour. However, there are restrictions on the size of the boat and the type of engine allowed. It is advised to check with the local authorities before launching any watercraft on Detroit Lake. Get driving directions.