Creve Coeur Lake
St. Louis County, MissouriView mapDirections
Missouri DNR publishes the water-quality measurements for Creve Coeur Lake. Here is what has been measured.
- Hypereutrophic
Creve Coeur Lake in St. Louis County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1.6 ft visibility. Phosphorus: 101 µg/L. Chlorophyll-a (algae): 35.4 µg/L.
Creve Coeur Lake is a highly nutrient-loaded hypereutrophic lake in St. Louis County, Missouri. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in St. Louis County, Creve Coeur Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-19. Methodology: how these readings are compared.
Vrbo is where to look for cabins and lake homes around Creve Coeur Lake, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Creve Coeur Lake is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Creve Coeur Lake
These are the measurements Missouri DNR publishes for Creve Coeur Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.6 ft of visibility. Phosphorus 101 µg/L. Chlorophyll-a 35.4 µg/L. TSI 69.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 101µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 35.4µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 69 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Creve Coeur Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Creve Coeur Lake typically sits around 79°F at the surface in September. Summer average is about 84°F. Usually warmest in Jul (about 85°F) and coldest in Apr (about 64°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (64°F) to its warmest (85°F).
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 →
Stays via Stay22
Stays near Creve Coeur Lake
Compare lakeside cabins, hotels, and vacation rentals near Creve Coeur Lake in St. Louis 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Creve Coeur Lake are listed below.
Top-rated places to stay near Creve Coeur Lake
Prices for Oct 23–25, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Missouri’s top lakes →
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Fishing Creve Coeur Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Worsening+7.75 µg/L/yr5 years
Chlorophyll-a
Worsening+3.24 µg/L/yr5 years
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.
Nearby Lakes in St. Louis County
Frequently asked questions about Creve Coeur Lake
Where is Creve Coeur Lake?
- Creve Coeur Lake is a lake in St. Louis County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Creve Coeur Lake?
- Creve Coeur Lake in St. Louis County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 1.6 ft visibility. Phosphorus: 101 µg/L. Chlorophyll-a (algae): 35.4 µg/L.
Is Creve Coeur Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Creve Coeur Lake?
- Creve Coeur Lake typically sits around 79°F at the surface in September, from 46 EPA Water Quality Portal field readings (2015–2024). That is a typical value for the month, not a live reading.
Explore Creve Coeur Lake across LakeQuality
Planning a trip around Gateway Arch?
Creve Coeur Lake is about 17 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 lakes in Missouri
Other Lakes in Missouri
Hypereutrophic Lakes in Missouri
Where this data comes from
119 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC119 samples · 2020–2024
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)