Ogallala Aquifer Quick Facts
- Major aquifer that underlies the entire HPWD service area.
- Deposition of the Ogallala Formation began 10-12 million years ago
- Soil types include sand, gravel, silt, and clay
- One of the largest aquifers in the world (approximately 174,000 square miles)
- Stretches across portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas)
- Water flows from northwest to southeast at about 150 feet per year under natural conditions