Creve Coeur Lake Nr. Boat Ramp is a highly nutrient-loaded hypereutrophic lake in St. Louis County, Missouri. Water quality is graded F based on 3 sampling years through 2020. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 3 public boat landings. Compared to the 8 other monitored lakes in St. Louis County, Creve Coeur Lake Nr. Boat Ramp ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2020-10-05. 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 1.2 ft of visibility. Phosphorus level: 100 µg/L. Chlorophyll-a: 92.9 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | F |
| Phosphorus | 100 µg/L | F |
| Chlorophyll-a (Algae) | 92.9 µg/L | F |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Creve Coeur Lake Nr. Boat Ramp
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Fishing Creve Coeur Lake Nr. Boat Ramp
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 |
Recreation & Access
Water Temperature
Creve Coeur Lake Nr. Boat Ramp averages about 82°F at the surface in summer, usually warmest in Jul (about 83°F) and coldest in Apr (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 72 field readings (2010–2020) via the EPA Water Quality Portal. See the full Creve Coeur Lake Nr. Boat Ramp water temperature breakdown →
Location
County Ranking
Ranked #7 of 9 lakes in St. Louis County
Cleaner Lakes Within 30 Miles
Creve Coeur Lake Nr. Boat Ramp holds Grade F. 5 nearby lakes hold higher grades.
- DSimpson Park LakeSt. Louis County · 11 mi · Higher grade (F → D)
- DSimpson Park LakeSt. Louis County · 11 mi · Higher grade (F → D)
- DForest Park PondSt. Louis city County · 11.8 mi · Higher grade (F → D)
- FMallard LakeSt. Louis County · 1.2 mi · Higher overall water quality score
- DJefferson LakeSt. Louis city County · 12.8 mi · Higher grade (F → D)
Nearby Lakes in St. Louis County
Explore Creve Coeur Lake Nr. Boat Ramp 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
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
19 EPA-permitted facilities operate within about 5 miles of Creve Coeur Lake Nr. Boat Ramp under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 2 facilities have a reported Clean Water Act violation in the past three years.
- Msd Missouri River WwtpSt. Louis · 2.2 mi away · NPDES MO0004391Major
- Champ Landfill Company, LlcMaryland Heights · 1.7 mi away · NPDES MO0097543Recent violation
- Bridgeton LandfillBridgeton · 4.3 mi away · NPDES MO0112771Recent violation
- Lafrance Manufacturing CompanyMaryland Heights · 2.5 mi away · NPDES MONX00403
- Maryland Heights Public WorksMaryland Heights · 3.3 mi away · NPDES MONX00351
- Spectrum Brands Pet Group Inc.Bridgeton · 3.4 mi away · NPDES MONX00730
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
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2020-10-05
Monitoring stations: 1