Maps General TBNRD Maps Tri-Basin Sub-District Map (approved December 14, 2021) High Plains/Ogallala Aquifer Gosper County River Basins Phelps County River Basins Kearney County River Basins Tri-Basin NRD Political and Hydrological Boundaries TBNRD Improvement Project Areas (IPAs) Saturated Thickness of the Aquifer in Tri-Basin NRD Groundwater Quality Maps Groundwater Quality Management Area TBNRD Average Nitrate Level - 2021 TBNRD Average Nitrate Level - 2020 TBNRD Change in Nitrate Level - 2016-2017 NRD Groundwater Quality Regulations Across Nebraska Irrigation Wells Sampled for Water Quality Groundwater Quantity Maps Overappropriated Area of Platte River TBNRD Integrated Water Management Area TBNRD Observation Wells TBNRD Observation Well Network and Stream Gauges TBNRD Groundwater Quantity Management Area TBNRD Change in Groundwater Elevation NRD Groundwater Quantity Regulations Across Nebraska
