Tuggeranong Creek rises below Tuggeranong Hill, east of the suburb of Theodore and the Monaro Highway, formed through rural runoff within Monks Pond. The creek flows generally west and north-west, through Theodore, past the playing fields located in Calwell, through Richardson where it passes close to Tuggeranong Homestead, and through Isabella Plains, gathering urban stormwater drainage. Tuggeranong Creek is impounded at Bonython to form Isabella Pond, which is also impounded to form Lake Tuggeranong, a man-made artificial lake.