For basin maps prior to October 2020, please visit our legacy basin maps.
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These maps are produced in partnership with the NRCS. Data are compiled by the Montana Snow Survey Program of the USDA Natural Resources Conservation Service. Please see the NRCS web site for explanations of their data collection programs. For additional information, contact: Lucas Zukiewicz, Hydrologist Natural Resources Conservation Service Lucas.Zukiewicz@mt.usda.gov (406) 587-6843
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