Carlsbad Irrigation District, Dark Canyon Siphon, On Main Canal, 1 mile South of Carlsbad, Carlsbad, Eddy County, NM
Significance: The Carlsbad Irrigation District is nationally significant as an excellent surviving representation of a large turn-of-the-century reclamation system. The District includes significant engineering features constructed by nineteenth-century private entrepreneurs as well as early twentieth-century features constructed by the United States Reclamation Service. Many of the features were technologically innovative for their day.
Survey number: HAER NM-4-F
National Register of Historic Places NRIS Number: 66000476