Kinmundy New Lake is a 100-acre productive, nutrient-rich eutrophic lake in Marion County, Illinois. Water quality is graded D based on 2 sampling years through 2022. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 5 other monitored lakes in Marion County, Kinmundy New Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2022-10-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.9 ft of visibility. Phosphorus level: 36.5 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 ft | F |
| Phosphorus | 36.5 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 100 acres |
| Public Access | Yes |
Where to stay near Kinmundy New Lake
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Fishing Kinmundy New Lake
Recreation & Access
Water Temperature
Kinmundy New Lake averages about 77°F at the surface in summer, usually warmest in Aug (about 79°F) and coldest in Apr (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 410 field readings (2010–2022) via the EPA Water Quality Portal. See the full Kinmundy New Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 6 lakes in Marion County
Nearby Lakes in Marion County
Explore Kinmundy New Lake across LakeGrade
More Illinois Lake Rankings
Other Grade D Lakes in Illinois
Eutrophic Lakes in Illinois
More records, surveys & data sources
Reservoir Info (USACE NID)
Kinmundy New Lake is a man-made reservoir impounded by the Kinmundy New Lake Dam (completed 1998), built primarily for recreation on the TRIB EAST FORK KASKASKIA RIVER; earth-type dam, 38 ft tall and 1,250 ft long.
- Surface area
- 100 ac
- Normal storage
- 1,192 ac-ft
- Max storage
- 2,250 ac-ft
- Drainage area
- 1.91 sq mi
- Hazard class
- High
- Owner
- CITY OF KINMUNDY
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID IL50271 · Operator website
EPA Impairment Status
Kinmundy New Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_SOF · Official waterbody report
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2022-10-12
Monitoring stations: 3