Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Late-nineteenth and early-twentieth-century dams, canals, and related works diverted the Pecos River for farming around Carlsbad. Avalon Dam and associated structures are the public face of a National Historic Landmark district documented in detail on the National Register. The system is large-scale desert irrigation engineering that shaped the lower Pecos Valley.