Sinneeg Lake
Sinneeg Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11 ft visibility. Maximum depth: 32 ft. Surface area: 160.49 acres.
- Clarity
- 11 ft
- Max depth
- 32 ft
- Area
- 160 acres
- Trend
- ↑ Improving
- Public access
- No
Next lake in St. Louis County
Why Sinneeg 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 Sinneeg 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.
Sinneeg Lake is a 160-acre lake in St. Louis County, Minnesota with a maximum depth of 32 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-07-08. 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 Sinneeg Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 11 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Sinneeg Lake
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Top-rated places to stay near Sinneeg Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 32 ft |
| Surface Area | 160 acres |
| Shoreline Length | 4.4 mi |
| Littoral Zone | 65% |
| Public Access | No |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Sinneeg Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1973-08-22 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Walleye | 15.25 | 1.44 lb |
| White Sucker | 8.00 | 1.48 lb |
| Northern Pike | 1.75 | 2.96 lb |
| Yellow Perch | 1.25 | 0.06 lb |
| Green Sunfish | 0.25 | 0.1 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
From the 1973-08-22 survey
(portage, not rough. The principal fish present are walleye, sucker, yellow perch, and northern pike. The northern pike and yellow perch population are low in abundance. The sucker population is about average for the area. Walleye are abundante, especially over 12 younger age classes seem to be lacking, as are walleye…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Sinneeg Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — SinneegFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.155 m/yr | 2 |
Nearby Lakes in St. Louis County
Frequently asked questions about Sinneeg Lake
What is the water quality grade for Sinneeg Lake?
- Sinneeg Lake in St. Louis County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11 ft visibility. Maximum depth: 32 ft. Surface area: 160.49 acres.
Is Sinneeg Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Sinneeg 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 Sinneeg Lake?
- Sinneeg Lake has a maximum depth of 32 feet. The lake covers 160.49 acres.
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA1 sample · 2023
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder