The west side of Mount Lincoln drains into Hop Brook and Amethyst Brook, thence into Fort River, the Connecticut River, and Long Island Sound. The east side drains into Jabish Brook, following its course into Belchertown, Massachusetts where the watershed splits into the Jabish Canal and Jabish Brook. The Jabish Canal flows into Broad Brook, thence into the Chicopee River, the Connecticut River, and Long Island Sound; Jabish Brook flows into the Swift River, the Ware River, thence the Chicopee River, Connecticut River, and Long Island Sound.