In 1465 a charter was granted by Cardinal Antonius of Rome for the Cistercian order of monks from Melrose to build a monastery on the site of the old British fort and druidical circle at Friar's Carse.

[11] Carse Loch is now much reduced in surface area through drainage and is enclosed within a marsh surrounded by a part of the Stottpark woodlands.

The original crannog is said to have collapsed under the water surface in 1879 following its archaeological investigation, although one or two islands are still shown on modern OS maps.

The corn mill or miln (Scots), shown near 'Grange Loch' in 1747, was still operational in 1909[8] fed by the Laggan Burn with two holding ponds with a dam and sluice located to the south of the minor road at Burnhead.

The OS maps show that the lade leading away from the mill originally emptied into the Mains Burn until the 1890s when the water entered the partly drained loch directly.

A mill building is also shown in 1855 at Carse Mains Farm below Penflowing Bridge, where a small millpond and dam was once located.