O'Connors Lake
Washington County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for O'Connors Lake. Here is what has been measured.
- Eutrophic
- Limited data
O'Connors Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 6.6 ft visibility. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 13.5 µg/L.
O'Connors 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, O'Connors Lake ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-30. Methodology: how these readings are compared.
What O'Connors Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
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 O'Connors 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 O'Connors Lake
These are the measurements Minnesota PCA publishes for O'Connors 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 6.6 ft. Phosphorus 32 µg/L. Chlorophyll-a 13.5 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 32µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 13.5µg/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. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about O'Connors Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
O'Connors Lake typically sits around 62°F at the surface in October. Summer average is about 78°F. Usually warmest in Jul (about 82°F) and coldest in May (about 62°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (62°F) to its warmest (82°F).
Typical surface water temperature by month, from 17 field readings (2011–2024) via the EPA Water Quality Portal. See the full O'Connors Lake water temperature breakdown →
Recreation & Access
Public campgrounds near O'Connors Lake
- Campground1.6 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near O'Connors Lake
Compare lakeside cabins, hotels, and vacation rentals near O'Connors 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.
Top-rated places to stay near O'Connors Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Fishing O'Connors Lake
Nearby Lakes in Washington County
Frequently asked questions about O'Connors Lake
Where is O'Connors Lake?
- O'Connors 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 O'Connors Lake?
- O'Connors Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 6.6 ft visibility. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 13.5 µg/L.
Is O'Connors 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 O'Connors Lake?
- O'Connors Lake typically sits around 62°F at the surface in October, from 17 EPA Water Quality Portal field readings (2011–2024). That is a typical value for the month, not a live reading.
Can I fish at O'Connors Lake?
- Public access to O'Connors 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.
Are there campgrounds on O'Connors Lake?
- O'Connors Lake has 1 public campground from USGS The National Map within 5 km, including Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore O'Connors 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
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State Parks Near O'Connors Lake
Other Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
23 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
MNPCA23 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
Public campgrounds from USGS The National Map Structures, within about 3 miles