Pentwater Lake Northwest Basin; Pentwater Township
Oceana County, WisconsinEutrophic
Pentwater Lake Northwest Basin; Pentwater Township is a productive, nutrient-rich eutrophic lake in Oceana County, MI. Water quality is graded B based on 2 sampling years through 2023. The lake supports 1 documented fish species including Brown trout. Compared to the 4 other monitored lakes in Oceana County, Pentwater Lake Northwest Basin; Pentwater Township ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-10-21. Grade methodology: LakeGrade methodology.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7 ft. Chlorophyll-a: 9.6 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 9.6 µg/L | B |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fish Species
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Location
County Ranking
Ranked #2 of 5 lakes in Oceana County
Cleaner Lakes Within 30 Miles
Pentwater Lake Northwest Basin; Pentwater Township holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Oceana County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Lapeer County · Clarity: 9.5 ft
Livingston County · Clarity: 13 ft
Manistee County · Clarity: 11 ft
Lake County · Clarity: 14 ft
Cass County · Clarity: 10.5 ft
Genesee County · Clarity: 10 ft
Eutrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-10-21
Monitoring stations: 1