Unnamed Lake
St. Louis County, Minnesota12 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Unnamed Lake. Here is what has been measured.
- 7 ft max depth
- Limited data
Unnamed Lake in St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 4.8 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8.4 µg/L. Maximum depth: 7 ft. Surface area: 11.9 acres.
Minnesota DNR's Standard Survey on July 27, 2009 caught 0.25 largemouth bass per trap net at Unnamed Lake. Length samples in the latest survey that recorded them ran 2–7 inches. DNR survey details →
Unnamed Lake is a 12-acre lake in St. Louis County, Minnesota with a maximum depth of 7 feet. The lake supports 6 documented fish species including black bullhead, bluegill, and largemouth bass. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2022-09-26. 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 Apr 23
Swimming conditions
No readingLimited data
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 4.8 ft. Phosphorus 27 µg/L. Chlorophyll-a 8.4 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 27µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 8.4µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Unnamed Lake
Answers come straight from the public measurements and survey records on this page.
Minnesota DNR's Standard Survey on July 27, 2009 caught 0.25 largemouth bass per trap net at Unnamed Lake. Length samples in the latest survey that recorded them ran 2–7 inches.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Unnamed Lake’s water-quality measurements separately. 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: 2009-07-27 (Standard Survey).
1 survey on file · most recent 2009-07-27 (Standard Survey)
17 years old| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Pumpkinseed | 51.25 | 3–5 in 2009-07-27 | 0.04 lb |
| White Sucker | 20.92 | 6–16 in 2009-07-27 | 0.68 lb |
| Golden Shiner | 10.88 | 5–7 in 2009-07-27 | 0.08 lb |
| Black Bullhead | 6.17 | 7–8 in 2009-07-27 | 0.29 lb |
| Yellow Perch | 4.17 | 2–13 in 2009-07-27 | 0.11 lb |
| Largemouth Bass | 1.25 | 2–7 in 2009-07-27 | 0.14 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.
Pumpkinseed
White Sucker
Golden Shiner
Black Bullhead
From the 2009-07-27 survey
Hartley Pond has a surface area of 11-acres, is 100% littoral and has a maximum depth of 7 feet. The lake is located entirely within the City of Duluth and Hartley Park. Hartley Pond can be accessed by portaging 0.25 miles across a trail that originates at the parking lot of the Hartley Nature Center. Shore fishing is…
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 — UnnamedFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
7 ft
Surface area
12 acres
Shoreline
0.7 mi
Littoral zone
100%
Share shallower than 15 ft
Public access
No
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
Ice season
Typical ice-out
Apr 23
Earliest Apr 15, 2006 · Latest Apr 23, 2008
Typical ice-in
Nov 25
Earliest Nov 13, 2008 · Latest Dec 16, 2006
Most recent ice-out
Apr 23
2008
6 observations · Minnesota PCA ice records
Reservoir Info (USACE NID)
Unnamed Lake is a man-made reservoir impounded by the Hartley Pond (completed 1975), built primarily for flood risk reduction on the Tischer Creek; gravity-type dam, 15 ft tall and 250 ft long.
- Surface area
- 20 ac
- Normal storage
- 54 ac-ft
- Max storage
- 90 ac-ft
- Drainage area
- 4 sq mi
- Hazard class
- High
- Owner
- City of Duluth
Source: USACE National Inventory of Dams, NID ID MN00004 · Operator website · Matched by proximity (0.07 km)
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Unnamed Lake under Clean Water Act (NPDES) discharge permits.
- Miller Hill MallDuluth · 3.9 mi away · NPDES MN0056979
- Wal-Mart Stores IncDuluth · 4.7 mi away · NPDES MN0060372
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 St. Louis County
Frequently asked questions about Unnamed Lake
Where is Unnamed Lake?
- Unnamed Lake is a lake in St. Louis 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 St. Louis County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 4.8 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 8.4 µg/L. Maximum depth: 7 ft. Surface area: 11.9 acres.
Is Unnamed Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Unnamed Lake?
- Unnamed Lake has a maximum depth of 7 feet. The lake covers 11.9 acres.
What fish are in Unnamed Lake?
- Fish species found in Unnamed Lake include black bullhead, bluegill, largemouth bass, pumpkinseed, white sucker, yellow perch. Unnamed Lake is located in St. Louis County, Minnesota.
What did the DNR fisheries survey find at Unnamed Lake?
- Minnesota DNR's Standard Survey on July 27, 2009 caught 0.25 largemouth bass per trap net at Unnamed Lake. Length samples in the latest survey that recorded them ran 2–7 inches. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Unnamed Lake’s water-quality measurements separately. 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 Apr 23. Ice typically forms around Nov 25. The open water season is approximately 216 days.
Can I fish at Unnamed Lake?
- Public access to Unnamed 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
5 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA5 samples · 2022
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2130 B ~ Nephelometric Method
- 2120 B ~ Color in Water by Visual Comparison
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