This watershed refers to the Mud Creek flowing through Port Franks, not to the tributaries of the Ausable River and Parkhill Creek, which have the same name.
The Mud Creek basin is a 70-square-kilometre area at the southwestern edge of the Ausable Bayfield Conservation Authority (ABCA) area.
Mud Creek begins northwest of Arkona and flows northwards through Lambton Shores and empties into Lake Huron at Port Franks. Agriculture is the predominant land use in this upstream basin.
Approximately 24 per cent of the Mud Creek watershed is forested, most of which occurs in the dunes between Highway 21 and Lake Huron.
The scattered upstream woodlots are generally oriented north-south, paralleling the stream system in the middle reaches and running perpendicular to it in the upper reaches. Few sides of streams are wooded.