Helmer_nelson Pond Deep
Cook County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Helmer_nelson Pond Deep. Here is what has been measured.
- Eutrophic
- Limited data
Helmer_nelson Pond Deep in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Helmer_nelson Pond Deep is a productive, nutrient-rich eutrophic lake in Cook County, Minnesota. Overall water quality is declining over recent sampling years. Compared to the 43 other monitored lakes in Cook County, Helmer_nelson Pond Deep ranks #38 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-05-21. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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 Helmer_nelson Pond 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 Helmer_nelson Pond Deep
These are the measurements Minnesota PCA publishes for Helmer_nelson Pond 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 2.5 ft of visibility. Phosphorus 60 µg/L. Chlorophyll-a 2.9 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 60µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 2.9µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Helmer_nelson Pond Deep
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Helmer_nelson Pond Deep typically sits around 54°F at the surface in October. Summer average is about 67°F. Usually warmest in Jul (about 70°F) and coldest in May (about 47°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (47°F) to its warmest (70°F).
Typical surface water temperature by month, from 71 field readings (2011–2025) via the EPA Water Quality Portal. See the full Helmer_nelson Pond Deep water temperature breakdown →
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Stays near Helmer_nelson Pond Deep
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Fishing Helmer_nelson Pond Deep
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2025).
Water clarity
Worsening3 years
Phosphorus
Improving-8.73 µg/L/yr5 years
Chlorophyll-a
Worsening+4.56 µg/L/yr4 years
Nearby Lakes in Cook County
Frequently asked questions about Helmer_nelson Pond Deep
Where is Helmer_nelson Pond Deep?
- Helmer_nelson Pond 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 Helmer_nelson Pond Deep?
- Helmer_nelson Pond Deep in Cook County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.5 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Is Helmer_nelson Pond 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 Helmer_nelson Pond Deep?
- Helmer_nelson Pond Deep typically sits around 54°F at the surface in October, from 71 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
31 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX31 samples · 2021–2025
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 5310 C ~ Total Organic Carbon in Water- Ultraviolet Oxidation Method
- 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.