The Lower Tittabawassee Watershed (LTW) for the SASWA is a 37.3 square mile portion of the Lower Tittabawassee Watershed, a sub-watershed of the Saginaw Bay Watershed located in Michigan's Eastern Lower Peninsula. The LTW drains portions of four municipalities and townships within Saginaw County. The LTW discharges into a confluence forming the Saginaw River. The LTW conveys its flow southeast through Saginaw County until it discharges into the Saginaw River. The Saginaw River then flows 22.3 miles northeast to Lake Huron, discharging into Saginaw Bay.