Lake Seymour (Vermont)

Seymour Lake is located in the town of Morgan in Orleans County, Vermont, an area known as the Northeast Kingdom. The lake was named for Israel Seymour, one of the original grantees. Natives called it Namagonic ("salmon trout spearing place"). It is one of only two deep, cold, and oligotrophic lakes in the Clyde River system.

The freshwater lake covers 1732 acre and is 3 mi long and 2 mi wide; its maximum depth is 167 ft. It is shaped like a giant number "7". The lake is fed by two primary streams, an outlet from Mud Pond and Sucker Brook. The lake drains into Echo Pond, which empties into the Clyde River, Lake Memphremagog and, eventually, Canada's St. Lawrence River.

A dam is used for hydroelectric power. Construction on the dam was completed in 1928. It has a normal surface area of 2.8 sqmi. It is owned by Citizens Utilities Company. The dam is made of stone with a concrete core. The foundation is soil. The height is 7 ft with a length of 68 ft. Maximum discharge is 85 ft3 per second. Its capacity is 5200 acre.ft. Normal storage is 3500 acre.ft. It drains an area of 20.1875 sqmi.

The dam was rebuilt in 2004.