Steven Aalbers, Information Coordinator/GIS, Drinking Water Program, Water Quality Division, Oregon Department of Environmental Quality.This polygon layer contains a spatial representation of a geographic area that is designated as a Groundwater Management Area for the Lower Umatilla Basin in Oregon.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/7ed7aee719da4abcb1f8c5980b3f8eb3_0engOregon GEOHubPublicGroundwater Management Area Lower Umatilla [Oregon]Web servicesOregonLast Modified: 2023-06-28