Long Pond-Richardson Beach is a highly nutrient-loaded hypereutrophic lake in Middlesex County, Massachusetts. Water quality is graded F based on 1 sampling years through 2025. Compared to the 14 other monitored lakes in Middlesex County, Long Pond-Richardson Beach ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Massachusetts DNR, last sampled 2025-07-01. 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. Phosphorus level: 1230 µg/L. Trophic State Index: 107.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 1230 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 107 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Long Pond-Richardson Beach
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Fishing Long Pond-Richardson Beach
Location
County Ranking
Ranked #9 of 15 lakes in Middlesex County
Nearby Lakes in Middlesex County
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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: 2025-07-01
Monitoring stations: 1