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US Geological Survey - stream flow data for Colorado
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US Geological Survey - stream flow data for Iowa
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US Geological Survey - stream flow data for Montana
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US Geological Survey - stream flow data for Nebraska
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US Geological Survey - stream flow data for North Dakota
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US Geologcial Survey - stream flow data for South Dakota
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US Geological Survey - stream flow data for Wyoming
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US Department of the Interior - Bureau of Reclamation - Great Plains Region
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Colorado Division of Water Resources - surface water conditions for the South Platte River Basin
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Papio-Missouri River Natural Resources District - regional government agency