Unnamed Lake
Unnamed Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. 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.
- Clarity
- 4.8 ft
- Max depth
- 7 ft
- Area
- 12 acres
- Public access
- No
- Ice-out
- Apr 23
- Open water
- 216 days
Next lake in St. Louis County
Why Unnamed Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Unnamed Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Unnamed Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.8 ft. Phosphorus level: 27 µg/L. Chlorophyll-a: 8.4 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | Not graded |
| Phosphorus | 27 µg/L | Not graded |
| Chlorophyll-a (Algae) | 8.4 µg/L | Not graded |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Unnamed Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamed Lake in St. Louis 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.
Top-rated places to stay near Unnamed Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 7 ft |
| Surface Area | 12 acres |
| Shoreline Length | 0.7 mi |
| Littoral Zone | 100% |
| Public Access | No |
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: 2009-07-27 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Pumpkinseed | 51.25 | 0.04 lb |
| White Sucker | 20.92 | 0.68 lb |
| GOS | 10.88 | 0.08 lb |
| Black Bullhead | 6.17 | 0.29 lb |
| Yellow Perch | 4.17 | 0.11 lb |
| Largemouth Bass | 1.25 | 0.14 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.
Pumpkinseed
White Sucker
GOS
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
Ice Season
Historical ice data from Minnesota DNR (6 observations).
Estimated open water season: 216 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2006-04-15 (2006) | 2008-04-23 (2008) |
| Ice-In | 2008-11-13 (2008) | 2006-12-16 (2006) |
Most recent ice-out: 2008-04-23
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
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Unnamed Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 8.4 µg/L. Always check local health department advisories before swimming.
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.
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.
Explore Unnamed Lake across LakeGrade
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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)
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
Ice data from Minnesota DNR Climate