Cuffs Lake Deep
Cuffs Lake Deep in Cook County, Minnesota has a water quality grade of C (Fair). Phosphorus: 31 µg/L. Chlorophyll-a (algae): 8 µg/L.
- Typical in July
- 73°F
- Type
- Eutrophic
- Trend
- ↓ Declining
Next lake in Cook County
Cuffs Lake Deep is a productive, nutrient-rich eutrophic lake in Cook County, Minnesota. Water quality is graded C based on 2 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 43 other monitored lakes in Cook County, Cuffs Lake Deep ranks #41 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-09. Grade methodology: LakeGrade methodology.
Watch Cuffs Lake Deep water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 31 µg/L. Chlorophyll-a: 8 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 31 µg/L | Fair |
| Chlorophyll-a (Algae) | 8 µg/L | Fair |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Cuffs Lake Deep
Compare lakeside cabins, hotels, and vacation rentals near Cuffs Lake Deep in Cook County, Minnesota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Cuffs Lake Deep
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Cuffs Lake Deep typically sits around 73°F at the surface in July. Summer average is about 73°F. Usually warmest in Jul (about 73°F) and coldest in May (about 63°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 40 field readings (2010–2024) via the EPA Water Quality Portal. See the full Cuffs Lake Deep water temperature breakdown →
Fishing Cuffs Lake Deep
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -14.121 m/yr | 3 |
| Phosphorus | ↑ Improving | -9.24 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.76 µg/L/yr | 4 |
County Ranking
Ranked #41 of 44 lakes in Cook County
Nearby Lakes in Cook County
Frequently asked questions about Cuffs Lake Deep
What is the water quality grade for Cuffs Lake Deep?
- Cuffs Lake Deep in Cook County, Minnesota has a water quality grade of C (Fair). Phosphorus: 31 µg/L. Chlorophyll-a (algae): 8 µg/L.
Is Cuffs Lake Deep safe to swim in?
- Generally safe for swimming, moderate water quality. Cuffs Lake Deep has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 8 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Cuffs Lake Deep?
- Cuffs Lake Deep typically sits around 73°F at the surface in July, from 40 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Cuffs Lake Deep across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Cook County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
High nutrients, frequent algae, reduced clarity
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
State Parks Near Cuffs Lake Deep
Other Grade C Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
27 measurements from 2 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX14 samples · 2022–2024 - 21GPBCH - Grand Portage Beaches (Tribal)
21GPBCH13 samples · 2020
Analytical methods
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
Monitoring station identifiers (2)
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.