Master Man Lake
Master Man Lake in Washington County, Minnesota has a water quality grade of A (Excellent). Water clarity: 4.5 ft visibility. Phosphorus: 19 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
- Clarity
- 4.5 ft
- Typical in August
- 74°F
- Max depth
- ~21 ft est.
- Type
- Mesotrophic
- Public access
- No
Next lake in Washington County
Master Man Lake is a mesotrophic lake in Washington County, Minnesota with an estimated average depth of about 21 feet. Water quality is graded A based on 2 sampling years through 2024. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 74 other monitored lakes in Washington County, Master Man Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Murky, only visible to about 4.5 ft. Phosphorus level: 19 µg/L. Chlorophyll-a: 4.3 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.5 ft | Not graded |
| Phosphorus | 19 µg/L | Good |
| Chlorophyll-a (Algae) | 4.3 µg/L | Good |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Master Man Lake
Compare lakeside cabins, hotels, and vacation rentals near Master Man Lake in Washington 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.
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Water Temperature
Master Man Lake typically sits around 74°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 76°F) and coldest in Apr (about 50°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 120 field readings (2010–2024) via the EPA Water Quality Portal. See the full Master Man Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~21 ft est. |
| Average Depth | ~11 ft est. |
| Public Access | No |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Minnesota has not published bathymetry for Master Man Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Master Man Lake
County Ranking
Ranked #16 of 75 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Master Man Lake
What is the water quality grade for Master Man Lake?
- Master Man Lake in Washington County, Minnesota has a water quality grade of A (Excellent). Water clarity: 4.5 ft visibility. Phosphorus: 19 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
Is Master Man Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Master Man Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 4.3 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Master Man Lake?
- Master Man Lake typically sits around 74°F at the surface in August, from 120 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Master Man Lake?
- No published bathymetric survey covers Master Man Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 21 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Master Man Lake across LakeGrade
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Where this data comes from
56 measurements 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
MNPCA56 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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