Reshanau Lake
Reshanau Lake in Anoka County, Minnesota has a water quality grade of D (Nutrient-rich). 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.
- Clarity
- 3.1 ft
- Typical in August
- 77°F
- Max depth
- 16 ft
- Area
- 337 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- No
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Reshanau Lake →
Next lake in Anoka County
Reshanau Lake is a 337-acre productive, nutrient-rich eutrophic lake in Anoka County, Minnesota with a maximum depth of 16 feet. Water quality is graded D based on 2 sampling years through 2024. 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. 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 3.1 ft of visibility. Phosphorus level: 51 µg/L. Chlorophyll-a: 19 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | 51 µg/L | Poor |
| Chlorophyll-a (Algae) | 19 µg/L | Poor |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay 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 grade measures nutrients and algae, not lodging — cabins and rentals around Reshanau Lake are listed below.
Top-rated places to stay near Reshanau Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Reshanau Lake typically sits around 77°F at the surface in August. 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.
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
| Characteristic | Value |
|---|---|
| Maximum Depth | 16 ft |
| Surface Area | 337 acres |
| Shoreline Length | 4.2 mi |
| Littoral Zone | 100% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Reshanau Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.023 m/yr | 5 |
| Phosphorus | ↑ Improving | -26.7 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -2.97 µg/L/yr | 4 |
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN02-0009-00 · Official waterbody report
County Ranking
Ranked #19 of 23 lakes in Anoka County
Nearby Lakes With Higher Grades
Reshanau Lake holds Grade D. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Anoka County
Frequently asked questions about Reshanau Lake
What is the water quality grade for Reshanau Lake?
- Reshanau Lake in Anoka County, Minnesota has a water quality grade of D (Nutrient-rich). 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?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Reshanau Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 19 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Reshanau Lake?
- Reshanau Lake typically sits around 77°F at the surface in August, 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.
Explore Reshanau Lake across LakeGrade
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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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder