Kruse Lake
St. Charles County, MissouriView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Kruse Lake in St. Charles County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.6 ft visibility.
- Clarity
- 2.6 ft
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Stays near Kruse Lake
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Watch Kruse Lake’s letter
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Why Kruse Lake has no grade
Kruse Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Kruse Lake is Not Rated — not an F. Its 2.6-foot median from 5 readings collected 2024 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Kruse Lake is a lake in St. Charles County, Missouri.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-14. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Kruse Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.6 ft of visibility. TSI 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Kruse Lake
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.
Graded lakes near Kruse Lake
Kruse Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in St. Charles County
Frequently asked questions about Kruse Lake
Where is Kruse Lake?
- Kruse Lake is a lake in St. Charles County, Missouri. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Kruse Lake?
- Kruse Lake in St. Charles County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.6 ft visibility.
Is Kruse Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Kruse Lake across LakeQuality
Planning a trip around Gateway Arch?
Kruse Lake is about 34 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 Lakes in Missouri
Eutrophic Lakes in Missouri
Where this data comes from
5 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC5 samples · 2024
Analytical methods
- Depth, Secchi disk in meters
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)