Tag: Matt Warner Reservoir

Matt Warner Reservoir is located on Diamond Mountain, north of Vernal in Uintah County. DEQ’s recreational water quality monitoring checks for two health concerns: Harmful Algal Blooms (HABs) and Waterborne Pathogens (E. coli). Find the most recent monitoring information below. Updates: December 1, 2025: Recreational water quality monitoring update Recreational water quality monitoring has ended…