Upper Mystic Lake is a productive, nutrient-rich eutrophic lake in Middlesex County, Massachusetts. Water quality is graded B based on 1 sampling years through 2015. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 14 other monitored lakes in Middlesex County, Upper Mystic Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Massachusetts DNR, last sampled 2015-06-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Phosphorus level: 28.2 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 28.2 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Upper Mystic Lake
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Fishing Upper Mystic Lake
Recreation & Access
Location
County Ranking
Ranked #3 of 15 lakes in Middlesex County
Nearby Lakes in Middlesex County
Explore Upper Mystic Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Massachusetts's cleanest and most-polluted lakes, ranked
More Massachusetts Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Grade B Lakes in Massachusetts
Eutrophic Lakes in Massachusetts
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2015-06-17
Monitoring stations: 1