After leaving football, McColl went into business as a sub-postmaster and newsagent in Netherlee, East Renfrewshire.
The river forms the boundary between East Renfrewshire and South Lanarkshire here before running through the centre of the village of Busby after which it runs around the eastern side of Clarkston and Netherlee where it crosses the Glasgow city boundary into Linn Park, heading downstream to Cathcart.