Water Resources of South Dakota

Hydrologic information and appraisal of the state's water resources, provided by the U.S. Geological Survey.
http://wwwsd.cr.usgs.gov/

South Dakota Geological Survey

Mission is to conduct geologic studies, hydrologic studies, and research; and to collect, correlate, preserve, interpret, and disseminate information, leading to a better understanding of the geology and hydrology of South Dakota.
http://www.sdgs.usd.edu/

Black Hills Weather Information

Includes information about chinook winds, how geography affects weather, and other aspects of the meteorology of the Black Hills region.
http://www.BlackHillsWeather.com

Lake Pelican Water Project District

Formed to improve the quality of the water in Lake Pelican near Watertown. Flood protection, projects, video, and contact information.
http://www.lakepelicanwaterprojdist.com/