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How can I obtain information about test holes and observation wells that have been drilled in the state? The Geological Survey Program maintains a database of test holes and observation wells. This database contains information for more than 32,000 test holes and observation wells across the state. If you want to know what is available in any specific location, you can contact the Geological Survey Program and request site-specific information, or visit the Testholes and Wells page to view a map. Are there any maps showing the location of the aquifers near my land? The Geological Survey Program publishes reports that describe the geology and hydrology of the counties in the state. These reports contain maps and figures that show the locations of the aquifers. These reports can be obtained by contacting the Geological Survey Program. How many earthquakes have been recorded in South Dakota? Seventy-six earthquakes have been recorded with epicenters in South Dakota from the years 1872 through 2000. The first one to be recorded was about 25 miles north of Pierre in February of 1872. The most recent was a 3.1 magnitude (Richter scale) quake in Mellette County in July 1998. View our Earthquakes page to see the locations of recorded earthquakes in South Dakota. For a full listing of recorded earthquakes and a map showing their locations, contact the Geological Survey Program. Are there any oil and gas wells in South Dakota? Yes, there were 147 oil wells and 58 gas wells in production as of October 1997. Oil was first discovered in Harding County in 1954, with later discoveries as far east as the Lantry field in Dewey County and as far south as Fall River County. How do I obtain reports and maps from the Geological Survey Program? Reports and maps can be ordered directly from the Geological Survey Program. A document listing all of the Geological Survey Program reports is available at no charge. The Geological Survey Program is an Earth Science Information Center. This means we are an authorized dealer of US Geological Survey maps and other products. The Geological Survey Program has an inventory of all topographic maps of the State of South Dakota. I just purchased land in the Black Hills. How do I develop a good quality water well and how deep will it need to be? A person should always check into the potential water supply before purchasing the land. In some areas, the water bearing materials are very deep and it is expensive to drill for water. Other areas may have water quality problems or may not yield sufficient quantities of water to supply a household. Check with the Geological Survey Program for specific site information. |
