Mt Maud Lake Mid Basin
Mt Maud Lake Mid Basin in Cook County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility.
- Clarity
- 2.5 ft
- Typical in August
- 70°F
- Trend
- ↑ Improving
Next lake in Cook County
Swipe left or right on this bar to open the next or previous lake.
Why Mt Maud Lake Mid Basin has no grade
We grade a lake only when the monitoring record supports a letter: 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 Mt Maud Lake Mid Basin, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. 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.
Mt Maud Lake Mid Basin is a lake in Cook County, Minnesota. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-25. Grade methodology: LakeQuality methodology.
Watch Mt Maud Lake Mid Basin water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Mt Maud Lake Mid Basin
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.5 ft of visibility. Trophic State Index: 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mt Maud Lake Mid Basin
Compare lakeside cabins, hotels, and vacation rentals near Mt Maud Lake Mid Basin in Cook 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 Mt Maud Lake Mid Basin
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Mt Maud Lake Mid Basin typically sits around 70°F at the surface in August. Summer average is about 70°F. Usually warmest in Jun (about 71°F) and coldest in May (about 54°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 70 field readings (2011–2025) via the EPA Water Quality Portal. See the full Mt Maud Lake Mid Basin water temperature breakdown →
Fishing Mt Maud Lake Mid Basin
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.05 m/yr | 3 |
| Phosphorus | ↓ Declining | +6.5 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -1.05 µg/L/yr | 2 |
Graded lakes near Mt Maud Lake Mid Basin
Mt Maud Lake Mid Basin has no grade, but these lakes within a short drive do.
Nearby Lakes in Cook County
Frequently asked questions about Mt Maud Lake Mid Basin
Where is Mt Maud Lake Mid Basin?
- Mt Maud Lake Mid Basin is a lake in Cook County, Minnesota. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Mt Maud Lake Mid Basin?
- Mt Maud Lake Mid Basin in Cook County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.5 ft visibility.
Is Mt Maud Lake Mid Basin safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mt Maud Lake Mid Basin is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What is the water temperature of Mt Maud Lake Mid Basin?
- Mt Maud Lake Mid Basin typically sits around 70°F at the surface in August, from 70 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
Explore Mt Maud Lake Mid Basin across LakeQuality
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Cook County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
State Parks Near Mt Maud Lake Mid Basin
Other Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
29 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Grand Portage Reservation
GPC5_WQX29 samples · 2021–2025
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.