Quiver Lake is a highly nutrient-loaded hypereutrophic lake in Mason County, Illinois. Water quality is graded F based on 1 sampling years through 2023. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2023-07-17. Grade methodology: LakeGrade methodology.
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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
Where to stay near Quiver Lake
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Fishing Quiver Lake
Recreation & Access
Location
County Ranking
Ranked #1 of 1 lakes in Mason County
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Quiver Lake holds Grade F. One nearby lake has a higher grade.
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Very high nutrients, dense algae, poor clarity
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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)
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Quiver Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 4 facilities have a reported Clean Water Act violation in the past three years.
- Dynegy Midwest Generation LlcHavana · 4.4 mi away · NPDES IL0001571MajorRecent violation
- Bradford Stp, Village OfBradford · 2.5 mi away · NPDES IL0022195Recent violation
- Idot Spoon River Rest Area - StpElba Township · 2.5 mi away · NPDES IL0064505Recent violation
- Havana Stp, City OfHavana · 4.1 mi away · NPDES IL0023388Recent violation
- Havana Coal Transfer FacilityHavana · 1.4 mi away · NPDES IL0070882
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2023-07-17
Monitoring stations: 1