Reshanau Lake
Anoka County, Minnesota337 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Reshanau Lake. Here is what has been measured.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- 16 ft max depth
- Limited data
Reshanau Lake in Anoka County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.1 ft visibility. Phosphorus: 51 µg/L. Chlorophyll-a (algae): 19 µg/L. Maximum depth: 16 ft. Surface area: 336.5 acres.
Reshanau Lake is a 337-acre productive, nutrient-rich eutrophic lake in Anoka County, Minnesota with a maximum depth of 16 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 22 other monitored lakes in Anoka County, Reshanau Lake ranks #19 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-02. Methodology: how these readings are compared.
Reshanau Lake covers about 340 acres in Anoka County. Vrbo is where to look for cabins and lake homes around Reshanau Lake, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
Readings onlyRecreation use not supported
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. Reshanau Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Reshanau 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 Reshanau Lake
These are the measurements Minnesota PCA publishes for Reshanau Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3.1 ft of visibility. Phosphorus 51 µg/L. Chlorophyll-a 19 µg/L. TSI 60.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 51µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 19µg/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. | 60 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Reshanau Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Reshanau Lake typically sits around 72°F at the surface in September. Summer average is about 78°F. Usually warmest in Jul (about 82°F) and coldest in Sep (about 72°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (72°F) to its warmest (82°F).
Typical surface water temperature by month, from 17 field readings (2010–2024) via the EPA Water Quality Portal. See the full Reshanau Lake water temperature breakdown →
Lake Details
Max depth
16 ft
Surface area
337 acres
Shoreline
4.2 mi
Littoral zone
100%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Elevation
866 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Reshanau Lake
Compare lakeside cabins, hotels, and vacation rentals near Reshanau Lake in Anoka 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 Reshanau Lake are listed below.
Top-rated places to stay near Reshanau Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
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Fishing Reshanau Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-26.7 µg/L/yr4 years
Chlorophyll-a
Improving-2.97 µg/L/yr4 years
EPA Impairment Status
Reshanau Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN02-0009-00 · Official waterbody report
Nearby Lakes in Anoka County
Frequently asked questions about Reshanau Lake
Where is Reshanau Lake?
- Reshanau Lake is a lake in Anoka County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Reshanau Lake?
- Reshanau Lake in Anoka County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 3.1 ft visibility. Phosphorus: 51 µg/L. Chlorophyll-a (algae): 19 µg/L. Maximum depth: 16 ft. Surface area: 336.5 acres.
Is Reshanau Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Reshanau Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Reshanau Lake?
- Reshanau Lake typically sits around 72°F at the surface in September, from 17 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Reshanau Lake?
- Reshanau Lake has a maximum depth of 16 feet. The lake covers 336.5 acres.
Can I fish at Reshanau Lake?
- Public access to Reshanau 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.
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Where this data comes from
24 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
MNPCA24 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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder