Creve Coeur Lake is a productive, nutrient-rich eutrophic lake in St. Louis County, Missouri. Water quality is graded F based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 8 other monitored lakes in St. Louis County, Creve Coeur Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-19. 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 1.6 ft of visibility. Phosphorus level: 101 µg/L. Chlorophyll-a: 35.4 µg/L. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 101 µg/L | F |
| Chlorophyll-a (Algae) | 35.4 µg/L | F |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Creve Coeur Lake
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Fishing Creve Coeur Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.01 m/yr | 5 |
| Phosphorus | ↓ Declining | +7.75 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +3.24 µg/L/yr | 5 |
Water Temperature
Creve Coeur Lake averages about 84°F at the surface in summer, usually warmest in Jul (about 85°F) and coldest in Apr (about 64°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 46 field readings (2015–2024) via the EPA Water Quality Portal. See the full Creve Coeur Lake water temperature breakdown →
Location
County Ranking
Ranked #4 of 9 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Creve Coeur Lake holds Grade F. 5 nearby lakes hold higher grades.
- DSimpson Park LakeSt. Louis County · 10.6 mi · Higher grade (F → D)
- DSimpson Park LakeSt. Louis County · 10.7 mi · Higher grade (F → D)
- DForest Park PondSt. Louis city County · 11.7 mi · Higher grade (F → D)
- FMallard LakeSt. Louis County · 0.9 mi · Higher overall water quality score
- DJefferson LakeSt. Louis city County · 12.6 mi · Higher grade (F → D)
Nearby Lakes in St. Louis County
Explore Creve Coeur Lake across LakeGrade
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
Eutrophic Lakes in Missouri
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
16 EPA-permitted facilities operate within about 5 miles of Creve Coeur Lake under Clean Water Act (NPDES) discharge permits.
- World Wide Technology IncMaryland Heights · 2.2 mi away · NPDES MONX00569
- Medix Biochemica Usa IncMaryland Heights · 2.4 mi away · NPDES MONX00481
- Intoximeters IncMaryland Heights · 2.4 mi away · NPDES MONX00667
- Medix Biochemica Usa IncMaryland Heights · 2.4 mi away · NPDES MONX00888
- Kindeva Drug DeliveriesSt. Louis · 2.4 mi away · NPDES MONX00381
- Oerlikon Balzers Coating Usa IncSt Louis · 2.5 mi away · NPDES MONX00733
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-19
Monitoring stations: 1