INFORMATION GATEWAYHydrology
- Department of Agriculture and Natural Resources
- Lake Levels - The surface elevation for many South Dakota lakes is measured each spring and fall.
- Observation Wells - A network of over 1550 observation wells into several aquifers throughout the South Dakota with water levels readings updated approximately once a month.
- Missouri River Basin Water Management Information
- USGS Current Water Data for South Dakota
- National Weather Service Advanced Hydrology Prediction Service