Kinmundy Old Lake
Marion County, IllinoisView mapDirections
Illinois EPA publishes the water-quality measurements for Kinmundy Old Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · Cause unknown
- Limited data
Kinmundy Old Lake in Marion County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Water clarity: 1.5 ft visibility. Phosphorus: 277 µg/L. Chlorophyll-a (algae): 114.8 µg/L.
Kinmundy Old Lake is a highly nutrient-loaded hypereutrophic lake in Marion County, Illinois. Compared to the 5 other monitored lakes in Marion County, Kinmundy Old Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2022-10-05. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Kinmundy Old Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown. Check local advisories before you swim.
Whether Kinmundy Old 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 Kinmundy Old Lake
These are the measurements Illinois EPA publishes for Kinmundy Old Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.5 ft of visibility. Phosphorus 277 µg/L. Chlorophyll-a 114.8 µg/L. TSI 78.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 277µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 115µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 78 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Kinmundy Old Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Kinmundy Old Lake typically sits around 64°F at the surface in October. Summer average is about 74°F. Usually warmest in Aug (about 76°F) and coldest in Apr (about 57°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (57°F) to its warmest (76°F).
Typical surface water temperature by month, from 160 field readings (2011–2022) via the EPA Water Quality Portal. See the full Kinmundy Old Lake water temperature breakdown →
Stays via Stay22
Stays near Kinmundy Old Lake
Compare lakeside cabins, hotels, and vacation rentals near Kinmundy Old Lake in Marion County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Kinmundy Old Lake are listed below.
Top-rated places to stay near Kinmundy Old Lake
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Fishing Kinmundy Old Lake
Reservoir Info (USACE NID)
Kinmundy Old Lake is a man-made reservoir impounded by the Kinmundy Lake Dam (completed 1885), built primarily for recreation on the TRIB EAST FORK KASKASKIA RIVER; earth-type dam, 25 ft tall and 1,050 ft long.
- Normal storage
- 87 ac-ft
- Max storage
- 121 ac-ft
- Hazard class
- Low
- Owner
- CITY OF KINMUNDY
Source: USACE National Inventory of Dams, NID ID IL00248 · Operator website · Matched by proximity (0.19 km)
EPA Impairment Status
Kinmundy Old Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Other.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_ROZY · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Kinmundy Old Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Alma Stp, Village OfAlma · 2.8 mi away · NPDES IL0076422Recent violation
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 Marion County
Frequently asked questions about Kinmundy Old Lake
Where is Kinmundy Old Lake?
- Kinmundy Old Lake is a lake in Marion County, Illinois. Its water-quality measurements are published by Illinois EPA and shown on this page as reported.
What is the water quality of Kinmundy Old Lake?
- Kinmundy Old Lake in Marion County, Illinois has water-quality measurements published by Illinois EPA, shown here as reported. Water clarity: 1.5 ft visibility. Phosphorus: 277 µg/L. Chlorophyll-a (algae): 114.8 µg/L.
Is Kinmundy Old Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Kinmundy Old Lake is listed impaired under Clean Water Act §303(d) (IR 5) for cause unknown. Check local advisories before you swim.
What is the water temperature of Kinmundy Old Lake?
- Kinmundy Old Lake typically sits around 64°F at the surface in October, from 160 EPA Water Quality Portal field readings (2011–2022). That is a typical value for the month, not a live reading.
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Other Lakes in Illinois
Hypereutrophic Lakes in Illinois
Where this data comes from
28 measurements from 2 monitoring stations, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- illinois epa
IL_EPA_WQX28 samples · 2022
Analytical methods
- MEASURED IN FIELD
- Phosphorus by Colorimetry
- 10200 H 2 ~ Chlorophyll a-b-c Determination by spectrophotometer
Monitoring station identifiers (2)
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)