Fitchburg Reservoir
Middlesex County, Massachusetts153 acresView mapDirections
MassDEP publishes the water-quality measurements for Fitchburg Reservoir. Here is what has been measured.
- Mesotrophic
- 34 ft max depth
- Limited data
Fitchburg Reservoir in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 2.8 µg/L. Surface area: 153 acres.
Fitchburg Reservoir is a 153-acre mesotrophic lake in Middlesex County, Massachusetts with an estimated average depth of about 34 feet. Compared to the 10 other monitored lakes in Middlesex County, Fitchburg Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2017-08-30. Methodology: how these readings are compared.
Fitchburg Reservoir covers about 150 acres in Middlesex County. Vrbo is where to look for cabins and lake homes around Fitchburg Reservoir, and Booking.com and Expedia search hotels near the lake for your dates.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Fitchburg Reservoir is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Fitchburg Reservoir
These are the measurements MassDEP publishes for Fitchburg Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Chlorophyll-a 2.8 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 2.8µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Fitchburg Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~34 ft est.
Surface area
153 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Fitchburg Reservoir.
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2 mi
HydroLAKES / HydroSHEDS
Elevation
1,004 ft
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.
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Stays near Fitchburg Reservoir
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Fishing Fitchburg Reservoir
Reservoir Info (USACE NID)
Fitchburg Reservoir is a man-made reservoir impounded by the Fitchburg Reservoir Southeast Dam (completed 1916), built primarily for water supply on the Falulah Brook; earth-type dam, 20 ft tall and 625 ft long.
- Surface area
- 153 ac
- Normal storage
- 1,651 ac-ft
- Max storage
- 2,586 ac-ft
- Drainage area
- 2.13 sq mi
- Hazard class
- Low
- Owner
- City of Fitchburg
Source: USACE National Inventory of Dams, NID ID MA00336 · Operator website · Matched by proximity (0.43 km)
Nearby Lakes in Middlesex County
Frequently asked questions about Fitchburg Reservoir
Where is Fitchburg Reservoir?
- Fitchburg Reservoir is a lake in Middlesex County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Fitchburg Reservoir?
- Fitchburg Reservoir in Middlesex County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 2.8 µg/L. Surface area: 153 acres.
Is Fitchburg Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Fitchburg Reservoir?
- No published bathymetric survey covers Fitchburg Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 34 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 153 acres.
Explore Fitchburg Reservoir across LakeQuality
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Other Lakes in Massachusetts
Mesotrophic Lakes in Massachusetts
Where this data comes from
3 measurements from 1 monitoring station, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2017
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)