Roaring Brook Lake
Franklin County, Massachusetts20 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 4 in the county
- Limited data
Roaring Brook Lake in Franklin County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 3.2 µg/L. Surface area: 20 acres.
- Area
- 20 acres
- Type
- Mesotrophic
- Chlorophyll-a
- 3.2 µg/L
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Watch Roaring Brook Lake’s letter
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Roaring Brook Lake is a 20-acre mesotrophic lake in Franklin County, Massachusetts. Water quality is graded A based on 1 sampling years through 2016. Compared to the 3 other monitored lakes in Franklin County, Roaring Brook Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2016-08-31. Grade methodology: LakeQuality methodology.
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.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
No clarity data. Chlorophyll-a 3.2 µg/L. TSI 42. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3.2 µg/L | Good |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 20 acres |
No bathymetric survey has been published for Roaring Brook Lake, so its depth is not documented here.
Fishing Roaring Brook Lake
Reservoir Info (USACE NID)
Roaring Brook Lake is a man-made reservoir impounded by the Conway Reservoir Dam (completed 1975), built primarily for water supply on the Roaring Brook; earth-type dam, 65 ft tall and 435 ft long.
- Surface area
- 20 ac
- Normal storage
- 450 ac-ft
- Max storage
- 553 ac-ft
- Drainage area
- 4 sq mi
- Hazard class
- High
- Owner
- South Deerfield Water Supply District
Source: USACE National Inventory of Dams, NID ID MA01056 · Operator website
County Ranking
Ranked #1 of 4 lakes in Franklin County
Nearby Lakes in Franklin County
Frequently asked questions about Roaring Brook Lake
Where is Roaring Brook Lake?
- Roaring Brook Lake is a lake in Franklin County, Massachusetts. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Roaring Brook Lake?
- Roaring Brook Lake in Franklin County, Massachusetts has a water quality grade of A (Excellent). Chlorophyll-a (algae): 3.2 µg/L. Surface area: 20 acres.
Is Roaring Brook Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Roaring Brook Lake across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
Moderate nutrients, good water quality
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Where this data comes from
3 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2016
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.