 The western slopes of the mountain drain to Orange Brook towards the town of Canaan, then via the Indian River to the Mascoma River, the Connecticut River, and ultimately Long Island Sound.The south slopes of the mountain flow via Mill Brook to the Smith River, a tributary of the Pemigewasset and Merrimack rivers, ultimately flowing to the Gulf of Maine.The eastern slopes of Mount Cardigan drain via Brock, Clark, and Davis brooks to the Fowler River, then via Newfound Lake and the Newfound River to the Pemigewasset.