Forest Park Pond is a productive, nutrient-rich eutrophic lake in St. Louis city County, Missouri. Water quality is graded D based on 3 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in St. Louis city County, Forest Park Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-20. 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 1.6 ft of visibility. Phosphorus level: 68.8 µg/L. Chlorophyll-a: 23.3 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 68.8 µg/L | D |
| Chlorophyll-a (Algae) | 23.3 µg/L | D |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Forest Park Pond
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Fishing Forest Park Pond
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | → Stable | -0.3 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -7.97 µg/L/yr | 2 |
Location
County Ranking
Ranked #4 of 5 lakes in St. Louis city County
Cleaner Lakes Within 30 Miles
Forest Park Pond holds Grade D. 2 nearby lakes hold higher grades.
- DO'Fallon Park LakeSt. Louis city County · 4.5 mi · Higher overall water quality score
- DBoathouse LakeSt. Louis city County · 5.4 mi · Higher overall water quality score
Nearby Lakes in St. Louis city County
Explore Forest Park Pond across LakeGrade
More Missouri Lake Rankings
Other Grade D Lakes in Missouri
St. Louis County · Clarity: 1.8 ft
St. Louis County · Clarity: 2.5 ft
St. Charles County · Clarity: 2.7 ft
St. Charles County · Clarity: 3.2 ft
St. Charles County · Clarity: 2.6 ft
Franklin County · Clarity: 2.6 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of Forest Park Pond under Clean Water Act (NPDES) discharge permits.
- NiesSt. Louis · 0.7 mi away · NPDES MONX00537
- Stlco Met Center City Of WellstonWellston · 2.1 mi away · NPDES MONX00326
- Obcorp LlcSt. Louis · 4.6 mi away · NPDES MONX00879
- United Industries D.B.A ChemsicoVinita Park · 4.6 mi away · NPDES MONX00125
- Reliable BiopharmaceuticalSt. Louis · 4.7 mi away · NPDES MONX00588
- Federal Express - ZwstSt. Louis · 4.9 mi away · NPDES MONX00761
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: 2024-09-20
Monitoring stations: 1