Mccoy Lake
Mccoy Lake in Hennepin County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 2.1 ft visibility. Phosphorus: 95 µg/L. Chlorophyll-a (algae): 8 µg/L.
- Clarity
- 2.1 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Mccoy Lake →
Next lake in Hennepin County
Mccoy Lake is a productive, nutrient-rich eutrophic lake in Hennepin County, Minnesota. Water quality is graded D based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 80 other monitored lakes in Hennepin County, Mccoy Lake ranks #34 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-05-22. Grade methodology: LakeGrade methodology.
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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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2.1 ft of visibility. Phosphorus level: 95 µg/L. Chlorophyll-a: 8 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | 95 µg/L | Poor |
| Chlorophyll-a (Algae) | 8 µg/L | Fair |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mccoy Lake
Compare lakeside cabins, hotels, and vacation rentals near Mccoy Lake in Hennepin 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Mccoy Lake are listed below.
Top-rated places to stay near Mccoy Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Recreation & Access
- Staring LakePublic
Fishing Mccoy Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.041 m/yr | 5 |
| Phosphorus | ↓ Declining | +1.69 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +2.69 µg/L/yr | 5 |
EPA Impairment Status
Mccoy Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0078-00 · Official waterbody report · Matched by proximity (0.85 km)
County Ranking
Ranked #34 of 81 lakes in Hennepin County
Nearby Lakes With Higher Grades
Mccoy Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Hennepin County
Frequently asked questions about Mccoy Lake
What is the water quality grade for Mccoy Lake?
- Mccoy Lake in Hennepin County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 2.1 ft visibility. Phosphorus: 95 µg/L. Chlorophyll-a (algae): 8 µg/L.
Is Mccoy Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Mccoy Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 8 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Mccoy Lake?
- Mccoy Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Staring Lake. Public access is listed as yes.
Explore Mccoy Lake across LakeGrade
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Where this data comes from
43 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA43 samples · 2020–2023
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory