Sunnybrook Lake
Washington County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Sunnybrook Lake. Here is what has been measured.
- Eutrophic
- Eurasian watermilfoil
- Limited data
Sunnybrook Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 4.5 ft visibility. Phosphorus: 41.5 µg/L. Chlorophyll-a (algae): 18.5 µg/L.
Sunnybrook Lake is a productive, nutrient-rich eutrophic lake in Washington County, Minnesota. 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. Methodology: how these readings are compared.
What Sunnybrook Lake is good for
From access and monitoring records, not editorial picks.
- Ice seasonIce-out around Apr 3
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 Sunnybrook Lake 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 Sunnybrook Lake
These are the measurements Minnesota PCA publishes for Sunnybrook Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.5 ft. Phosphorus 41.5 µg/L. Chlorophyll-a 18.5 µg/L. TSI 58.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 41.5µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 18.5µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Sunnybrook Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Sunnybrook Lake typically sits around 56°F at the surface in October. 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.
Column height runs from this lake’s coldest month (49°F) to its warmest (81°F).
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 →
Stays via Stay22
Stays 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Sunnybrook Lake are listed below.
Top-rated places to stay near Sunnybrook Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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 →
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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
Typical ice-out
Apr 3
Earliest Mar 16, 2016 · Latest Apr 29, 2018
Typical ice-in
Nov 30
Earliest Nov 12, 2019 · Latest Jan 4, 2024
Most recent ice-out
Apr 14
2023
33 observations · Minnesota PCA ice records
Nearby Lakes in Washington County
Frequently asked questions about Sunnybrook Lake
Where is Sunnybrook Lake?
- Sunnybrook Lake is a lake in Washington County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Sunnybrook Lake?
- Sunnybrook Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Sunnybrook Lake?
- Sunnybrook Lake typically sits around 56°F at the surface in October, 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.
Can I fish at Sunnybrook Lake?
- Public access to Sunnybrook Lake is listed as no on the lake record, so confirm before you make the trip. 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.
Explore Sunnybrook Lake across LakeQuality
Fish species and the cleanest 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 readings
Lakes in the St. Croix Watershed, ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
More lakes in Minnesota
State Parks Near Sunnybrook Lake
Other 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)
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.
Other records on this page
Ice data from Minnesota DNR Climate