Forest Park Pond
St. Louis city County, MissouriView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- #3 of 3 in the county
- Limited data
Forest Park Pond in St. Louis city County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 1.6 ft visibility. Phosphorus: 68.8 µg/L. Chlorophyll-a (algae): 23.3 µg/L.
- Clarity
- 1.6 ft
- Type
- Eutrophic
- Phosphorus
- 68.8 µg/L
- Chlorophyll-a
- 23.3 µg/L
- Trend
- ↑ Improving
Stays via Stay22
Stays near Forest Park Pond
Compare lakeside cabins, hotels, and vacation rentals near Forest Park Pond in St. Louis city County, Missouri — 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 grade measures nutrients and algae, not lodging — cabins and rentals around Forest Park Pond are listed below.
Top-rated places to stay near Forest Park Pond
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Watch Forest Park Pond’s letter
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Forest Park Pond is a productive, nutrient-rich eutrophic lake in St. Louis city County, Missouri. Water quality is graded D based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 2 other monitored lakes in St. Louis city County, Forest Park Pond ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1.6 ft of visibility. Phosphorus 68.8 µg/L. Chlorophyll-a 23.3 µg/L. TSI 66. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | Not graded |
| Phosphorus | 68.8 µg/L | Poor |
| Chlorophyll-a (Algae) | 23.3 µg/L | Poor |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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 |
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.
County Ranking
Ranked #3 of 3 lakes in St. Louis city County
Nearby Lakes in St. Louis city County
Frequently asked questions about Forest Park Pond
Where is Forest Park Pond?
- Forest Park Pond is a lake in St. Louis city County, Missouri. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Forest Park Pond?
- Forest Park Pond in St. Louis city County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 1.6 ft visibility. Phosphorus: 68.8 µg/L. Chlorophyll-a (algae): 23.3 µg/L.
Is Forest Park Pond safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Forest Park Pond across LakeQuality
Planning a trip around Gateway Arch?
Forest Park Pond is about 5 miles from Gateway Arch National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Gateway Arch →More Missouri Lake Rankings
Other Grade D Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
21 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC21 samples · 2024
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)