Tri-County Area Transmission Level Nov. 24, 2021. by TCHD | Nov 24, 2021 | News. Vernal, UT Nov. 24, 2021 - TriCounty Health Department (TCHD) announces that as of Nov. 24, 2021 Uintah County is in high transmission level, Duchesne County is in moderate transmission level and Daggett is in low transmission level. TCHD reports today 8,825 total....