Koeneman Park Lake is a highly nutrient-loaded hypereutrophic lake in St. Louis County, Missouri. Water quality is graded F based on 3 sampling years through 2020. Compared to the 8 other monitored lakes in St. Louis County, Koeneman Park Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2020-09-19. 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
Very murky, less than 3.1 ft of visibility. Phosphorus level: 270.8 µg/L. Chlorophyll-a: 35.9 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | F |
| Phosphorus | 270.8 µg/L | F |
| Chlorophyll-a (Algae) | 35.9 µg/L | F |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Koeneman Park Lake
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Fishing Koeneman Park Lake
Water Temperature
Koeneman Park Lake averages about 84°F at the surface in summer, usually warmest in Jul (about 85°F) and coldest in Apr (about 69°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 62 field readings (2010–2020) via the EPA Water Quality Portal. See the full Koeneman Park Lake water temperature breakdown →
Location
County Ranking
Ranked #5 of 9 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Koeneman Park Lake holds Grade F. 5 nearby lakes hold higher grades.
- DO'Fallon Park LakeSt. Louis city County · 4.6 mi · Higher grade (F → D)
- DBoathouse LakeSt. Louis city County · 12.2 mi · Higher grade (F → D)
- DForest Park PondSt. Louis city County · 7 mi · Higher grade (F → D)
- DLafayette Park LakeSt. Louis city County · 8.8 mi · Higher grade (F → D)
- DJefferson LakeSt. Louis city County · 7.2 mi · Higher grade (F → D)
Nearby Lakes in St. Louis County
Explore Koeneman Park Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
Jefferson County · Clarity: 1.3 ft
St. Charles County · Clarity: 2.6 ft
St. Charles County · Clarity: 2.3 ft
St. Francois County · Clarity: 1.1 ft
Audrain County · Clarity: 1.8 ft
Ralls County · Very Poor
Hypereutrophic Lakes in Missouri
More records, surveys & data sources
Regulated Pollution Sources Nearby
16 EPA-permitted facilities operate within about 5 miles of Koeneman Park Lake under Clean Water Act (NPDES) discharge permits.
- Abf Freight System IncSt Louis · 1.5 mi away · NPDES MONX00891
- City Of Bellefontaine NeighborsSt. Louis · 1.8 mi away · NPDES MONX00332
- Stlco Maintenance District OneFlorissant · 3 mi away · NPDES MONX00330
- Performance Foodservice MiddendorfBerkeley · 3.1 mi away · NPDES MONX01042
- Ups Scs St LouisSt Louis · 4.1 mi away · NPDES MONX00582
- Monarch Advanced SciencesBerkeley · 4.1 mi away · NPDES MONX00819
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-09-19
Monitoring stations: 1