Manomin Lake
Manomin Lake in Lake County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Maximum depth: 18 ft. Surface area: 409.05 acres.
- Clarity
- 2 ft
- Max depth
- 18 ft
- Area
- 409 acres
- Trend
- ↓ Declining
- Public access
- No
Next lake in Lake County
Why Manomin 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 Manomin Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not 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.
Manomin Lake is a 409-acre lake in Lake County, Minnesota with a maximum depth of 18 feet. Overall water quality is declining over recent sampling years. The lake supports 5 documented fish species including largemouth bass, northern pike, and pumpkinseed. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-07-12. 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 Manomin Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 2 ft of visibility. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Manomin Lake
Compare lakeside cabins, hotels, and vacation rentals near Manomin Lake in Lake 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 Manomin Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 18 ft |
| Surface Area | 409 acres |
| Shoreline Length | 6.7 mi |
| Littoral Zone | 99% |
| 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 Manomin Lake
DNR Fisheries Survey Summary
3 surveys on file from MN DNR Fisheries. Most recent: 2015-06-15 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Perch | 18.69 | 0.21 lb |
| White Sucker | 13.47 | 0.87 lb |
| Northern Pike | 2.83 | 2.05 lb |
| Pumpkinseed | 0.50 | 0.11 lb |
| GOS | 0.42 | 0.09 lb |
| Largemouth Bass | 0.17 | 0.16 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
White Sucker
Northern Pike
Pumpkinseed
From the 2015-06-15 survey
Manomin Lake is located approximately 16 miles NE of Ely in the BWCAW. This shallow lake has shorelines that are covered with dense conifers growing near the water's edge. The rocky shoreline quickly changes to a muck bottom and aquatic plants are common. There are two designated USFS campsites present and they appear…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Manomin Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — ManominFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.46 m/yr | 5 |
EPA Impairment Status
Manomin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN38-0619-00 · Official waterbody report · Matched by proximity (2.93 km)
Nearby Lakes in Lake County
Frequently asked questions about Manomin Lake
What is the water quality grade for Manomin Lake?
- Manomin Lake in Lake County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2 ft visibility. Maximum depth: 18 ft. Surface area: 409.05 acres.
Is Manomin Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Manomin Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Manomin Lake?
- Manomin Lake has a maximum depth of 18 feet. The lake covers 409.05 acres.
What fish are in Manomin Lake?
- Fish species found in Manomin Lake include largemouth bass, northern pike, pumpkinseed, white sucker, yellow perch. Manomin Lake is located in Lake County, Minnesota.
Explore Manomin Lake across LakeGrade
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Where this data comes from
1 measurement from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA1 sample · 2024
Analytical methods
- Field measurement/observation, generic method
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder