Spy Pond is a productive, nutrient-rich eutrophic lake in Middlesex County, Massachusetts. Water quality is graded F based on 1 sampling years through 2019. Compared to the 14 other monitored lakes in Middlesex County, Spy Pond ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Massachusetts DNR, last sampled 2019-10-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Chlorophyll-a: 33.6 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 33.6 µg/L | F |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Spy Pond
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Fishing Spy Pond
Location
County Ranking
Ranked #14 of 15 lakes in Middlesex County
Nearby Lakes in Middlesex County
Explore Spy Pond across LakeGrade
Species activity outlook by water temperature and season
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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
Most recent sample: 2019-10-30
Monitoring stations: 2