Unnamed Lake
Unnamed Lake in Sherburne County, Minnesota has a water quality grade of A (Excellent). Water clarity: 13 ft visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 3.6 µg/L. Maximum depth: 43 ft. Surface area: 35.78 acres.
- Clarity
- 13 ft
- Typical in August
- 77°F
- Max depth
- 43 ft
- Area
- 36 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- No
- Ice-out
- Apr 9
- Open water
- 233 days
Next lake in Sherburne County
Unnamed Lake is a 36-acre mesotrophic lake in Sherburne County, Minnesota with a maximum depth of 43 feet (13-foot average). Water quality is graded A based on 2 sampling years through 2025. Phosphorus level is improving over recent sampling years. The lake supports 7 documented fish species including black crappie, bluegill, and largemouth bass. No public access — the lake is private or restricted. Compared to the 17 other monitored lakes in Sherburne County, Unnamed Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 13 ft. Phosphorus level: 22 µg/L. Chlorophyll-a: 3.6 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | Not graded |
| Phosphorus | 22 µg/L | Good |
| Chlorophyll-a (Algae) | 3.6 µg/L | Good |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Unnamed Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamed Lake in Sherburne 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.
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Water Temperature
Unnamed Lake typically sits around 77°F at the surface in August. Summer average is about 77°F. Usually warmest in Jul (about 80°F) and coldest in May (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 31 field readings (2022–2025) via the EPA Water Quality Portal. See the full Unnamed Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 43 ft |
| Average Depth | 12.5 ft |
| Surface Area | 36 acres |
| Shoreline Length | 1.1 mi |
| Littoral Zone | 64% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Unnamed Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 2007-07-12 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Largemouth Bass | 85.83 | 1.28 lb |
| Yellow Bass | 21.75 | 0.67 lb |
| Bluegill | 14.88 | 0.11 lb |
| Northern Pike | 8.25 | 1.75 lb |
| Pumpkinseed | 1.63 | 0.07 lb |
| Yellow Perch | 0.25 | 0.07 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Largemouth Bass
Yellow Bass
Bluegill
Northern Pike
From the 2007-07-12 survey
Round Lake is a small (37 acres) basin connected to Pickerel and Long Lakes. The three lakes are located three miles west of Clear Lake in western Sherburne County. Clear Lake Township owns property on Long Lake and small boats can navigate to Round Lake through a connecting channel. Otherwise, there is no public…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Unnamed Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — RoundFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.061 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.57 µg/L/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.31 µg/L/yr | 3 |
Ice Season
Historical ice data from Minnesota DNR (24 observations).
Estimated open water season: 233 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2007-04-01 (2007) | 2018-05-01 (2018) |
| Ice-In | 2018-11-13 (2018) | 2004-12-18 (2004) |
Most recent ice-out: 2022-04-13
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Unnamed Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- Saint Cloud Nutrient Energy And Water Recovery FacilitySaint Cloud · 2.7 mi away · NPDES MN0040878Major
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #2 of 18 lakes in Sherburne County
Nearby Lakes in Sherburne County
Frequently asked questions about Unnamed Lake
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in Sherburne County, Minnesota has a water quality grade of A (Excellent). Water clarity: 13 ft visibility. Phosphorus: 22 µg/L. Chlorophyll-a (algae): 3.6 µg/L. Maximum depth: 43 ft. Surface area: 35.78 acres.
Is Unnamed Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Unnamed Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 3.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Unnamed Lake?
- Unnamed Lake typically sits around 77°F at the surface in August, from 31 EPA Water Quality Portal field readings (2022–2025). That is a typical value for the month, not a live reading.
How deep is Unnamed Lake?
- Unnamed Lake has a maximum depth of 43 feet and an average depth of 12.5 feet. The lake covers 35.78 acres.
What fish are in Unnamed Lake?
- Fish species found in Unnamed Lake include black crappie, bluegill, largemouth bass, northern pike, pumpkinseed, yellow bullhead, yellow perch. Unnamed Lake is located in Sherburne County, Minnesota.
When does Unnamed Lake thaw?
- Unnamed Lake typically has ice-out around Apr 9. Ice typically forms around Nov 28. The open water season is approximately 233 days.
Explore Unnamed Lake across LakeGrade
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Fish species and best lakes in Sherburne County
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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State Parks Near Unnamed Lake
Other Grade A Lakes in Minnesota
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Where this data comes from
128 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA128 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (2)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Ice data from Minnesota DNR Climate