Dutchman Lake Deep
Cook County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Dutchman Lake Deep. Here is what has been measured.
- Public access
- Limited data
Dutchman Lake Deep in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 31 µg/L. Chlorophyll-a (algae): 14.7 µg/L.
Dutchman Lake Deep is a lake in Cook County, Minnesota. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-10-11. 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 Dutchman Lake Deep 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 Dutchman Lake Deep
These are the measurements Minnesota PCA publishes for Dutchman Lake Deep, 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 2.3 ft of visibility. Phosphorus 31 µg/L. Chlorophyll-a 14.7 µg/L. TSI 59.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 31µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 14.7µg/L | Measured, not scored 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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Dutchman Lake Deep
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Dutchman Lake Deep typically sits around 57°F at the surface in October. Summer average is about 69°F. Usually warmest in Jul (about 72°F) and coldest in May (about 54°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (54°F) to its warmest (72°F).
Typical surface water temperature by month, from 179 field readings (2011–2023) via the EPA Water Quality Portal. See the full Dutchman Lake Deep water temperature breakdown →
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Stays near Dutchman Lake Deep
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Fishing Dutchman Lake Deep
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening4 years
Phosphorus
Worsening+1.4 µg/L/yr5 years
Chlorophyll-a
Improving-0.63 µg/L/yr4 years
Nearby Lakes in Cook County
Frequently asked questions about Dutchman Lake Deep
Where is Dutchman Lake Deep?
- Dutchman Lake Deep is a lake in Cook County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Dutchman Lake Deep?
- Dutchman Lake Deep in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 31 µg/L. Chlorophyll-a (algae): 14.7 µg/L.
Is Dutchman Lake Deep 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 Dutchman Lake Deep?
- Dutchman Lake Deep typically sits around 57°F at the surface in October, from 179 EPA Water Quality Portal field readings (2011–2023). That is a typical value for the month, not a live reading.
Can I fish at Dutchman Lake Deep?
- Public access to Dutchman Lake Deep 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
75 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX75 samples · 2021–2023
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.