Quaddick Reservoir is a man-made body of water in the town of Thompson, Connecticut.

The reservoir has three sections: Lower (124 acres),[2] Middle (203 acres),[3] and Upper (81 acres).

[4] It originated with the completion of a dam on the Five Mile River in 1865.

[5] Quaddick State Park sits on the eastern shore of the Middle Reservoir.

[6]