[1][7] From its source at Little Ball Lake in Mount Edziza Provincial Park, the Little Iskut River flows about 45 km (28 mi),[5] generally north to the vicinity of Mowdale Lake, then southeast and south to the Iskut River just below Cascade Falls.

The Little Iskut River's watershed covers 453 km2 (175 sq mi) and its mean annual discharge is an estimated 12.8 m3/s (450 cu ft/s).

[24] After Bourgeaux Creek, near Mowdade Lake,[25] the Little Iskut turns sharply to flow southeast.

[27][8][2][24] During the Miocene epoch, a series of lava flows from the adjacent Mount Edziza volcanic complex travelled east into the Little Iskut River.

Water discharging from this prehistoric lake eventually cut through the eastern edge of this dam to create a new course for the Little Iskut River.