DOE issued a notice of proposed floodplain action and floodplain assessment for storm water controls in Effluent, Mortandad, North Ancho, and Potrillo Canyons within Los Alamos National Laboratory.
Office of NEPA Policy and Compliance
March 12, 2026
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Floodplain Assessment for Stormwater Controls in Effluent, Mortandad, North Ancho, and Potrillo Canyons; Los Alamos County, New Mexico
The U.S. Department of Energy (DOE) Environmental Management Los Alamos Field Office (EM-LA) is issuing this notice of proposed floodplain action for the installation of storm water controls within the 100-year floodplains of Effluent, Mortandad, North Ancho, and Potrillo Canyons within Los Alamos National Laboratory (LANL). The proposed action would include the installation of rock check dams, rock plunge pools, coir logs, erosion control blankets, straw wattles, compost logs, and/or log check dams.
The 15-day public comment period for this proposed floodplain action ended on March 27, 2026. EM-LA then re-evaluated alternatives to the proposed floodplain action and the mitigating measures, taking into account all substantive comments received, and prepared a floodplain statement of findings.
For more information, see Floodplain Statement of Findings for Stormwater Controls in Effluent, Mortandad, North Ancho, and Potrillo Canyons, Los Alamos National Laboratory.