Unnamed Lake
Unnamed Lake in Nicollet County, Minnesota has a water quality grade of A (Excellent). Water clarity: 5.6 ft visibility. Phosphorus: 14.5 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Maximum depth: 35 ft. Surface area: 12.1 acres.
- Clarity
- 5.6 ft
- Typical in August
- 71°F
- Max depth
- 35 ft
- Area
- 12 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
- Ice-out
- Mar 27
- Open water
- 250 days
Next lake in Nicollet County
Unnamed Lake is a 12-acre mesotrophic lake in Nicollet County, Minnesota with a maximum depth of 35 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including black crappie, bluegill, and common carp. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Nicollet County, Unnamed Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-29. 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)
Murky, only visible to about 5.6 ft. Phosphorus level: 14.5 µg/L. Chlorophyll-a: 5.9 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | Not graded |
| Phosphorus | 14.5 µg/L | Good |
| Chlorophyll-a (Algae) | 5.9 µg/L | Good |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Unnamed Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamed Lake in Nicollet 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 71°F at the surface in August. Summer average is about 69°F. Usually warmest in Aug (about 71°F) and coldest in May (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 285 field readings (2016–2025) via the EPA Water Quality Portal. See the full Unnamed Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 35 ft |
| Surface Area | 12 acres |
| Shoreline Length | 0.5 mi |
| Public Access | Yes |
Recreation & Access
- St. PeterPublic
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: 1999-06-03 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Perch | 17.00 | 0.1 lb |
| Bluegill | 8.67 | 0.27 lb |
| Green Sunfish | 0.67 | 0.1 lb |
| Largemouth Bass | 0.67 | 0.04 lb |
| Black Crappie | 0.33 | 0.53 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.
Yellow Perch
Bluegill
Green Sunfish
Largemouth Bass
From the 1999-06-03 survey
Hallet's Pond is a 12-acre urban pond, formerly a gravel pit, located in the city of St. Peter, and currently functions as a stormwater detention basin. Currently there is no public access to the lake, but the city has purchased property adjacent to the lake and future plans may include the development of public…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Unnamed Lake. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — UnnamedFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — UnnamedFish Stocking History · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.257 m/yr | 6 |
| Phosphorus | ↓ Declining | +12 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -0.3 µg/L/yr | 3 |
Ice Season
Historical ice data from Minnesota DNR (38 observations).
Estimated open water season: 250 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2017-02-22 (2017) | 2018-04-23 (2018) |
| Ice-In | 2014-11-18 (2014) | 2024-01-08 (2024) |
Most recent ice-out: 2023-04-09
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Unnamed Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 2 facilities have a reported Clean Water Act violation in the past three years.
- Saint Peter WwtpSaint Peter · 0.2 mi away · NPDES MN0022535MajorRecent violation
- Covia Solutions Llc - Ottawa PlantLe Sueur · 2.3 mi away · NPDES MN0001716Recent violation
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 #1 of 2 lakes in Nicollet County
Nearby Lakes in Nicollet County
Frequently asked questions about Unnamed Lake
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in Nicollet County, Minnesota has a water quality grade of A (Excellent). Water clarity: 5.6 ft visibility. Phosphorus: 14.5 µg/L. Chlorophyll-a (algae): 5.9 µg/L. Maximum depth: 35 ft. Surface area: 12.1 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 5.9 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Unnamed Lake?
- Unnamed Lake typically sits around 71°F at the surface in August, from 285 EPA Water Quality Portal field readings (2016–2025). That is a typical value for the month, not a live reading.
How deep is Unnamed Lake?
- Unnamed Lake has a maximum depth of 35 feet. The lake covers 12.1 acres.
What fish are in Unnamed Lake?
- Fish species found in Unnamed Lake include black crappie, bluegill, common carp, green sunfish, largemouth bass, walleye. Unnamed Lake is located in Nicollet County, Minnesota.
When does Unnamed Lake thaw?
- Unnamed Lake typically has ice-out around Mar 27. Ice typically forms around Dec 2. The open water season is approximately 250 days.
Are there boat ramps on Unnamed Lake?
- Unnamed Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include St. Peter. Public access is listed as yes.
Explore Unnamed Lake across LakeGrade
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Where this data comes from
133 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA133 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory
Ice data from Minnesota DNR Climate