Oasis Ranch Upper Lake
Audrain County, WisconsinOligotrophic
Oasis Ranch Upper Lake is a cold, clear oligotrophic lake in Audrain County, MO. Water quality is graded A based on 3 sampling years through 2024. Compared to the 3 other monitored lakes in Audrain County, Oasis Ranch Upper Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-18. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.4 ft. Phosphorus level: 12 µg/L. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.4 ft | B |
| Phosphorus | 12 µg/L | A |
| Chlorophyll-a (Algae) | 1.8 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Location
County Ranking
Ranked #2 of 4 lakes in Audrain County
Nearby Lakes in Audrain County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Jefferson County · Clarity: 12.9 ft
St. Francois County · Clarity: 14.1 ft
Washington County · Clarity: 11.1 ft
St. Francois County · Clarity: 14.3 ft
Warren County · Clarity: 12.6 ft
St. Francois County · Clarity: 16.3 ft
Oligotrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-18
Monitoring stations: 1