The State of Utah's Lakes 2026

Cleanest lakes in Utah

Cleanest combined nutrient and algae readings, 2026.

1. 1.Flaming Gorge Reservoir Antelope Flat — Daggett County25.3 ft clarity · 7 µg/L P · 1 µg/L chl-a
2. 2.Flaming Gorge Reservoir — Daggett County31.8 ft clarity · 7 µg/L P · 1 µg/L chl-a
3. 3.Wide Hollow Reservoir — Garfield County13.8 ft clarity · 37 µg/L P · 3 µg/L chl-a
4. 4.Starvation Reservoir — Duchesne County11.2 ft clarity · 10 µg/L P · 1 µg/L chl-a
5. 5.Recapture Reservoir — San Juan County8.9 ft clarity · 15 µg/L P · 2 µg/L chl-a
6. 6.Red Fleet Reservoir — Uintah County5.9 ft clarity · 20 µg/L P · 2 µg/L chl-a
7. 7.Newton Reservoir — Cache County15.4 ft clarity · 26 µg/L P · 2 µg/L chl-a
8. 8.Hyrum Reservoir — Cache County6.9 ft clarity · 18 µg/L P · 2 µg/L chl-a
9. 9.Moon Lake — Duchesne County9.5 ft clarity · 11 µg/L P · 3 µg/L chl-a
10. 10.Lake Powell Off Cha Canyon — San Juan County13.1 ft clarity · 9 µg/L P

Highest measured algae

Highest measured chlorophyll-a (algae) concentration.

1. 1.Farmington Bay Lake — Davis County106 µg/L chlorophyll-a
2. 2.Newcastle Reservoir — Iron County89 µg/L chlorophyll-a
3. 3.Koosharem Reservoir — Sevier County58 µg/L chlorophyll-a
4. 4.Utah Lake Sp @ Marina — Utah County55 µg/L chlorophyll-a
5. 5.Yuba Reservoir Midway — Juab County38 µg/L chlorophyll-a
6. 6.Baker Dam Reservoir — Washington County30 µg/L chlorophyll-a
7. 7.Johnson Reservoir — Sevier County29 µg/L chlorophyll-a
8. 8.Gsl Farmington Bay Outflow Lake — Davis County28 µg/L chlorophyll-a
9. 9.Mill Meadow Reservoir — Wayne County23 µg/L chlorophyll-a
10. 10.Panguitch L Shore Lake — Garfield County22 µg/L chlorophyll-a

Trending lakes

Improving

1. 1.Recapture Reservoir — San Juan County
2. 2.Salem Pond — Utah County
3. 3.Hyrum Reservoir — Cache County
4. 4.Brough Reservoir — Uintah County
5. 5.Ferron Reservoir — Sanpete County
6. 6.Posey Lake — Garfield County
7. 7.Palisade Lake — Sanpete County
8. 8.Tropic Reservoir — Garfield County

Declining

1. 1.Koosharem Reservoir — Sevier County
2. 2.Lower Bowns Reservoir — Garfield County
3. 3.Lake Powell Hite Midchannel — San Juan County
4. 4.Big East Lake — Utah County
5. 5.Strawberry Reservoir Indian Creek Bay T — Wasatch County
6. 6.Whitney Reservoir — Summit County
7. 7.Woodruff Creek Reservoir — Rich County
8. 8.Baker Dam Reservoir — Washington County