The State of Oklahoma's Lakes 2026

Cleanest lakes in Oklahoma

Cleanest combined nutrient and algae readings, 2026.

1. 1.Lake Texoma — Grayson County4.2 ft clarity · 36 µg/L P · 13 µg/L chl-a
2. 2.Grand Lake — Delaware County1.6 ft clarity · 720 µg/L P
3. 3.Wes Watkins Reservoir — Pottawatomie County1.8 ft clarity · 32 µg/L P · 18 µg/L chl-a
4. 4.Lake Nahni Waiya Tuskahomma — Pushmataha County250 µg/L P
5. 5.Lake Sardis Clayton — Pushmataha County260 µg/L P
6. 6.Lake Hugo Hugo — Choctaw County430 µg/L P

Highest measured algae

Highest measured chlorophyll-a (algae) concentration.

1. 1.Lake Texoma — Johnston County233 µg/L chlorophyll-a
2. 2.Lake Thunderbird — Cleveland County29 µg/L chlorophyll-a
3. 3.Thunderbird Lake Nature Center — Pottawatomie County29 µg/L chlorophyll-a
4. 4.Coon Creek Lake — Kay County24 µg/L chlorophyll-a
5. 5.Lake Texoma — Marshall County23 µg/L chlorophyll-a
6. 6.Thunderbird Lake Fisherman'S — Cleveland County21 µg/L chlorophyll-a

Trending lakes

Improving

1. 1.Grand Lake — Delaware County
2. 2.Lake Konawa — Seminole County
3. 3.Eucha Lake — Delaware County
4. 4.Sportsman Lake — Seminole County
5. 5.Wewoka Lake — Seminole County
6. 6.Sandy Beach Lake — Osage County
7. 7.Osage Cove Lake — Osage County
8. 8.Thunderbird Lake Hog Creek — Cleveland County

Declining

1. 1.Greenleaf Lake — Muskogee County
2. 2.Spavinaw Lake — Mayes County
3. 3.Lake Sardis Clayton — Pushmataha County
4. 4.Fairfax Lake — Osage County
5. 5.Oologah Lake — Rogers County
6. 6.Sardis Lake — Pushmataha County
7. 7.Foss Reservoir — Custer County
8. 8.Langston Lake — Logan County