Kruse Lake is a productive, nutrient-rich eutrophic lake in St. Charles County, Missouri. Water quality is graded F based on 1 sampling years through 2024. Compared to the 10 other monitored lakes in St. Charles County, Kruse Lake ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. 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 2.6 ft of visibility. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Kruse Lake
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Fishing Kruse Lake
Location
County Ranking
Ranked #11 of 11 lakes in St. Charles County
Cleaner Lakes Within 30 Miles
Kruse Lake holds Grade F. 4 nearby lakes hold higher grades.
Nearby Lakes in St. Charles County
Explore Kruse Lake across LakeGrade
More Missouri Lake Rankings
Other Grade F Lakes in Missouri
St. Louis County · Clarity: 1.9 ft
St. Louis County · Clarity: 1.2 ft
St. Louis County · Clarity: 1.6 ft
St. Louis County · Very Poor
Jefferson County · Clarity: 1.3 ft
St. Louis County · Clarity: 3.1 ft
Eutrophic Lakes in Missouri
More records, surveys & data sources
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Kruse Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Cherokee Lakes Campground WwtpO'Fallon · 1.4 mi away · NPDES MO0117188Recent violation
- Stone Ridge Meadows Subdivision WwtfSt. Paul · 1.4 mi away · NPDES MO0132349Recent violation
- Dcsd Riverdale Subdivision WwtpSt. Paul · 1.6 mi away · NPDES MO0132152Recent 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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-14
Monitoring stations: 1