Quiver Lake
Mason County, WisconsinLimited DataHypereutrophic
Quiver Lake is a highly nutrient-loaded hypereutrophic lake in Mason County, IL. Water quality is graded F based on 1 sampling years through 2023.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-07-17. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Chlorophyll-a: 140 µg/L. Trophic State Index: 79.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 140 µg/L | F |
| Trophic State Index (TSI) | 79 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #1 of 1 lakes in Mason County
Cleaner Lakes Within 30 Miles
Quiver Lake holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Mason County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
EPA Impairment Status
Quiver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IL_WDL · Official waterbody report · Matched by proximity (2.26 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-17
Monitoring stations: 1