From Upperlands it quiets down through the Countryside outside Upperlands and on to Culnady where it flows under Dunglady Bridge an old bridge near Culnady named after Dunglady Fort which its name means Fort Above The Clady.

The River is famously known to be the reason William Clark & Sons in Upperlands exists as being the main power source for the Mill.

The River is leases by the Clady And District Angling Club funded in 1962.

Green Water Burn Starts south of Brockaghboy windfarm and flows a few miles and into the Knockoneil Corlacky Burn Starts on the Corlacky hill and flows into the Knockoneil.

Craigavole Burn The Craigavole burn is the third largest tributary of the Knockoneil river it starts in Craigavole townland and flows east of Swatragh underneath the GAC Swatragh football pitch and rounds a circle east of the town and then straight south and flows into the Knockoneil north of Beagh Bridge.