Course
The Black River is 26 miles (42 km) miles in length, originates east of Great Hosmer Pond with headwater tributaries flowing west off Ames Hill in Albany. It drains 134 square miles (347 km2) of land. This river has the lowest gradient of the three main rivers in the basin with an average slope of about 8 feet (2.4 m) per 1 mile (1.6 km). The Black River watershed contains over 600 acres (243 ha) of lakes and ponds, the three largest being Elligo Pond, Little Hosmer Pond and Great Hosmer Pond.
The current is slow. The drop from the source to Lake Memphremagog, including the falls at Irasburg and Coventry is 190 feet (58 m).
Read more about this topic: Black River (Lake Memphremagog)