Lafayette Park Lake
St. Louis city County, MissouriView mapDirections
Nutrients and algae run above the regional average.
- Eutrophic
- #2 of 3 in the county
- Limited data
Lafayette Park Lake in St. Louis city County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 2.3 ft visibility. Phosphorus: 127.5 µg/L. Chlorophyll-a (algae): 18.2 µg/L.
- Clarity
- 2.3 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
Stays via Stay22
Stays near Lafayette Park Lake
Compare lakeside cabins, hotels, and vacation rentals near Lafayette Park Lake 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 Lafayette Park Lake are listed below.
Top-rated places to stay near Lafayette Park Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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Watch Lafayette Park Lake’s letter
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Lafayette Park Lake 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 declining over recent sampling years. Compared to the 2 other monitored lakes in St. Louis city County, Lafayette Park Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-18. 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 2.3 ft of visibility. Phosphorus 127.5 µg/L. Chlorophyll-a 18.2 µg/L. TSI 66. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 ft | Not graded |
| Phosphorus | 127.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 18.2 µg/L | Fair |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Lafayette Park Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.011 m/yr | 3 |
| Phosphorus | ↓ Declining | +3.5 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +6.29 µg/L/yr | 3 |
Regulated Pollution Sources Nearby
18 EPA-permitted facilities operate within about 5 miles of Lafayette Park Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 8 facilities have a reported Clean Water Act violation in the past three years.
- Sauget-AbrtfSauget · 2.4 mi away · NPDES IL0065145MajorRecent violation
- Kinder Morgan St. Louis Liquid TerminalSt. Louis · 1.5 mi away · NPDES MO0136981Recent violation
- Watco Terminals And Port Services - Cahokia TerminalSauget · 1.8 mi away · NPDES IL0079367Recent violation
- East St Louis Combined Sewer, City OfEast Saint Louis · 2.3 mi away · NPDES IL0033472Recent violation
- Centerstream Stl, LlcSt. Louis · 2.4 mi away · NPDES MO0000345Recent violation
- Veolia Es Technical Solution LlcSauget · 2.6 mi away · NPDES IL0071552Recent 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.
County Ranking
Ranked #2 of 3 lakes in St. Louis city County
Nearby Lakes in St. Louis city County
Frequently asked questions about Lafayette Park Lake
Where is Lafayette Park Lake?
- Lafayette Park Lake 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 Lafayette Park Lake?
- Lafayette Park Lake in St. Louis city County, Missouri has a water quality grade of D (Nutrient-rich). Water clarity: 2.3 ft visibility. Phosphorus: 127.5 µg/L. Chlorophyll-a (algae): 18.2 µg/L.
Is Lafayette Park Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Lafayette Park Lake across LakeQuality
Planning a trip around Gateway Arch?
Lafayette Park Lake is about 2 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
24 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC24 samples · 2021–2024
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)