Vintage Real Photo Postcard. A panoramic view of the Ripogenus Dam in Northeast Piscataquis, Maine. Published by Eastern Illustrating & Publishing Co. Divided back, Kodak stampbox, unused. Condition: Excellent. Comments: Ripogenus Gorge is a rock-walled canyon formed where the West Branch Penobscot River crosses the Caribou Lake anticline. Ripogenus Falls controlled discharge from Ripogenus Lake until Ripogenus Dam was completed at the upstream end of the gorge in 1916. The dam forms a hydroelectric reservoir raising the level of Ripogenus Lake to include the upstream Chesuncook Lake, Caribou Lake, and Moose Pond.