Medway Creek runs a 214 km[1] watercourse, providing a 205 km2 watershed, the majority of which is Middlesex county farmland.
The Creek begins just north of Elginfield Rd (Highway #7), just east of Lucan, Ontario.
30% of the watercourse is natural, while 49% is channeled; the final 21% is buried in tile drains.
Traveling north on Highway #4 (Richmond St.), one can plainly see the creek's wandering path, as it frequently crosses the road.
However, 34% of the riparian zone, a 30-metre buffer on each side of the creek, is in permanent vegetation (forest and meadows).