Quiver Lake
Mason County, IllinoisView mapDirections
Illinois EPA publishes the water-quality measurements for Quiver Lake. Here is what has been measured.
- Public access
- Limited data
Quiver Lake in Mason County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Chlorophyll-a (algae): 140 µg/L.
Quiver Lake is a lake in Mason County, Illinois. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2023-07-17. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Quiver Lake is safe to swim in today is a call for the Illinois Environmental Protection Agency and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Quiver Lake
These are the measurements Illinois EPA publishes for Quiver Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 140 µg/L. TSI 79.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 140µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 79 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Answers come straight from the public measurements and survey records on this page.
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Fishing Quiver Lake
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.
Nearby Lakes in Mason County
Frequently asked questions about Quiver Lake
Where is Quiver Lake?
- Quiver Lake is a lake in Mason County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Quiver Lake?
- Quiver Lake in Mason County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Chlorophyll-a (algae): 140 µg/L.
Is Quiver Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Quiver Lake?
- Public access to Quiver Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Illinois's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Illinois Water Science Center
USGS-IL2 samples · 2023
Analytical methods
- Plant pigments, sonication & 445
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)