Grey Cloud Slough Lake
Washington County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Grey Cloud Slough Lake. Here is what has been measured.
- 6 aquatic invasives
- Public access
- Limited data
Grey Cloud Slough Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.3 ft visibility.
Grey Cloud Slough Lake is a lake in Washington County, Minnesota. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-10-05. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Grey Cloud Slough Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Grey Cloud Slough Lake
These are the measurements Minnesota PCA publishes for Grey Cloud Slough 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 3.3 ft of visibility. TSI 60.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 60 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Grey Cloud Slough Lake
Answers come straight from the public measurements and survey records on this page.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Grey Cloud Slough Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Public Water Access Sites — Grey Cloud SloughPublic Water Access Sites · MN DNR LakeFinder
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Stays near Grey Cloud Slough Lake
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Fishing Grey Cloud Slough Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Regulated Pollution Sources Nearby
10 EPA-permitted facilities operate within about 5 miles of Grey Cloud Slough Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers. 1 facility has a reported Clean Water Act violation in the past three years.
- Flint Hills Resources Pine Bend LlcRosemount · 3.4 mi away · NPDES MN0000418MajorRecent violation
- Mcws-RosemountRosemount · 3.8 mi away · NPDES MN0025488Major
- Aggregate Industries Inc - Nelson PlantGrey Cloud Island, Township Of · 0.9 mi away · NPDES MN0001309
- Larson QuarrySaint Paul Park · 1.3 mi away · NPDES MN0030473
- Minnesota Pipeline Co-HydroCottage Grove · 2.2 mi away · NPDES MN0056472
- Cf Industries Distribution Facilities Llc - Pine Bend TerminalRosemount · 2.7 mi away · NPDES MN0069418
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 Washington County
Frequently asked questions about Grey Cloud Slough Lake
Where is Grey Cloud Slough Lake?
- Grey Cloud Slough Lake is a lake in Washington County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Grey Cloud Slough Lake?
- Grey Cloud Slough Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.3 ft visibility.
Is Grey Cloud Slough Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Grey Cloud Slough Lake?
- Public access to Grey Cloud Slough Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
3 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA3 samples · 2023
Analytical methods
- Field measurement/observation, generic method
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)