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Devil's Gate Dam is a flood control dam in the Arroyo Seco in northern Pasadena between La Cañada Flintridge and Altadena. The location is the narrowest spot on the Arroyo Seco's course below Millard Canyon. Occultists Jack Parsons and Aleister Crowley believed the site of the dam was a portal to Hell. The area surrounding the dam has officially been renamed "Hahamongna," a Tongva phrase meaning "Flowing Waters, Fruitful Valley," although this is not the original Tongva name for the site.
Devil's Gate is so-named because of the natural rock feature at the site which resembles the Devil. A 1947 article in the Metropolitan Pasadena Star-News states that Devil's Gate was named in 1858 by Judge B.S. Eaton because of "its resemblance to a point of that name on Sweetwater Creek." Judge Eaton explained in a letter that he had seen the original point in 1850 when traveling along the old California trail with a team of oxen.