Unnamed Lake
Nicollet County, Minnesota12 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Unnamed Lake. Here is what has been measured.
- Mesotrophic
- 35 ft max depth
- Public access
Unnamed Lake in Nicollet County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. 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.
Minnesota DNR's Standard Survey on June 3, 1999 caught 17.00 yellow perch per gill net at Unnamed Lake. Length samples in the latest survey that recorded them ran 5–8 inches. DNR survey details →
Unnamed Lake is a 12-acre mesotrophic lake in Nicollet County, Minnesota with a maximum depth of 35 feet. 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. 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. Methodology: how these readings are compared.
What Unnamed Lake is good for
From access and monitoring records, not editorial picks.
- Fishing6 species recorded
- Ice seasonIce-out around Mar 27
- Deep water35 ft surveyed max depth
Swimming conditions
Readings onlyLow algae
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 Unnamed 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 Unnamed Lake
These are the measurements Minnesota PCA publishes for Unnamed 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 5.6 ft. Phosphorus 14.5 µg/L. Chlorophyll-a 5.9 µg/L. TSI 48.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 14.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 5.9µg/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. | 48 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Unnamed Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Unnamed Lake typically sits around 64°F at the surface in October. 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.
Column height runs from this lake’s coldest month (59°F) to its warmest (71°F).
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 →
Minnesota DNR's Standard Survey on June 3, 1999 caught 17.00 yellow perch per gill net at Unnamed Lake. Length samples in the latest survey that recorded them ran 5–8 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Unnamed Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1999-06-03 (Standard Survey).
1 survey on file · most recent 1999-06-03 (Standard Survey)
27 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Yellow Perch | 17.00 | 5–8 in 1999-06-03 | 0.1 lb |
| Bluegill | 8.67 | 4–9 in 1999-06-03 | 0.27 lb |
| Green Sunfish | 0.67 | 3–6 in 1999-06-03 | 0.1 lb |
| Largemouth Bass | 0.67 | 4–5 in 1999-06-03 | 0.04 lb |
| Black Crappie | 0.33 | 9 in 1999-06-03 | 0.53 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
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
Lake Details
Max depth
35 ft
Surface area
12 acres
Shoreline
0.5 mi
Public access
Yes
Listed by Minnesota PCA
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Stays near Unnamed Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Unnamed Lake
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Worsening+12 µg/L/yr2 years
Chlorophyll-a
Improving-0.3 µg/L/yr3 years
Ice season
Typical ice-out
Mar 27
Earliest Feb 22, 2017 · Latest Apr 23, 2018
Typical ice-in
Dec 2
Earliest Nov 18, 2014 · Latest Jan 8, 2024
Most recent ice-out
Apr 9
2023
38 observations · Minnesota PCA ice records
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.
Nearby Lakes in Nicollet County
Frequently asked questions about Unnamed Lake
Where is Unnamed Lake?
- Unnamed Lake is a lake in Nicollet County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Unnamed Lake?
- Unnamed Lake in Nicollet County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Unnamed Lake?
- Unnamed Lake typically sits around 64°F at the surface in October, 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.
What did the DNR fisheries survey find at Unnamed Lake?
- Minnesota DNR's Standard Survey on June 3, 1999 caught 17.00 yellow perch per gill net at Unnamed Lake. Length samples in the latest survey that recorded them ran 5–8 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Unnamed Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
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.
Can I fish at Unnamed Lake?
- Public access to Unnamed Lake is listed as yes on the lake record. 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.
Explore Unnamed Lake across LakeQuality
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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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake details from Minnesota DNR LakeFinder
Ice data from Minnesota DNR Climate