Sunnybrook Lake
Sunnybrook Lake in Washington County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 4.5 ft visibility. Phosphorus: 41.5 µg/L. Chlorophyll-a (algae): 18.5 µg/L.
- Clarity
- 4.5 ft
- Typical in August
- 76°F
- Type
- Eutrophic
- Public access
- No
- Ice-out
- Apr 3
- Open water
- 241 days
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Sunnybrook Lake →
Next lake in Washington County
Sunnybrook Lake is a productive, nutrient-rich eutrophic lake in Washington County, Minnesota. Water quality is graded D based on 2 sampling years through 2024. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 74 other monitored lakes in Washington County, Sunnybrook Lake ranks #62 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-08. Grade methodology: LakeGrade methodology.
Watch Sunnybrook Lake 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.
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)
Murky, only visible to about 4.5 ft. Phosphorus level: 41.5 µg/L. Chlorophyll-a: 18.5 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | 41.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 18.5 µg/L | Poor |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sunnybrook Lake
Compare lakeside cabins, hotels, and vacation rentals near Sunnybrook Lake in Washington 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 Sunnybrook Lake are listed below.
Top-rated places to stay near Sunnybrook Lake
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
Sunnybrook Lake typically sits around 76°F at the surface in August. Summer average is about 76°F. Usually warmest in Jul (about 81°F) and coldest in Apr (about 49°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 28 field readings (2011–2024) via the EPA Water Quality Portal. See the full Sunnybrook Lake water temperature breakdown →
Fishing Sunnybrook 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.
Ice Season
Historical ice data from Minnesota DNR (33 observations).
Estimated open water season: 241 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2016-03-16 (2016) | 2018-04-29 (2018) |
| Ice-In | 2019-11-12 (2019) | 2024-01-04 (2024) |
Most recent ice-out: 2023-04-14
County Ranking
Ranked #62 of 75 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Sunnybrook Lake
What is the water quality grade for Sunnybrook Lake?
- Sunnybrook Lake in Washington County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 4.5 ft visibility. Phosphorus: 41.5 µg/L. Chlorophyll-a (algae): 18.5 µg/L.
Is Sunnybrook 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. Sunnybrook Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 18.5 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Sunnybrook Lake?
- Sunnybrook Lake typically sits around 76°F at the surface in August, from 28 EPA Water Quality Portal field readings (2011–2024). That is a typical value for the month, not a live reading.
When does Sunnybrook Lake thaw?
- Sunnybrook Lake typically has ice-out around Apr 3. Ice typically forms around Nov 30. The open water season is approximately 241 days.
Explore Sunnybrook Lake across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Washington County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the St. Croix Watershed, 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 Sunnybrook Lake
Other Grade D Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
28 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA28 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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
Ice data from Minnesota DNR Climate