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A very interesting brief stop not far from I-17, south of Flagstaff, the lake maintains a constant temperature of 76 degrees because the hot springs deep beneath the surface feed more than a million gallons of water into the sink daily. The water flows out of the lake through a small channel and into a ditch on the east side which the pueblo natives used for irrigation. A path from the parking lot brings visitors to the top of the limestone sink for an overlook where puebloes in the limestone layers are visible. The path becomes steps down the inside of the limestone rim to lake level where another pueblo, a small bat cave and shady trees provide a restful visit on the surrounding desert. Another path from the rim leads down steps to the ditch outside the formation and beneath shady trees to the channel opening. Stay on the path and avoid the poison ivy along the ditch! Follow the steps back to a return path to the parking lot where a restroom is available. No water is available. A friendly park ranger can answer questions about the wildlife, geology and human activity at the Well. Don't forget to stamp your National Parks Passport.