State · United States · USGS · BOR · USACE · CDEC
Massachusetts
84.9% average fill
Measured
2
Volume stored
1,533 hm³
Measured capacity
1,806 hm³
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Reservoirs
Sorted by capacityQuabbin Reservoir
Updated 2026-06-01
Wachusett Reservoir
Updated 2026-06-01
Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.
⚠️ The most recent reading we have for Massachusetts is 18 days old — the official source may be delayed. Figures below may not reflect today’s levels.
About reservoirs in Massachusetts
As of June 1, 2026, the reservoirs we track across Massachusetts that report live levels hold roughly 1,533 hm³ of water — about 84.9% of their combined capacity. Taken together, Massachusetts's reservoirs are high.
None of the tracked reservoirs are currently at critically low levels. Wachusett Reservoir is the fullest at 94.2%, while Quabbin Reservoir is the lowest at 83.4%.
Storage figures for Massachusetts come from USGS · USACE · BOR · CDEC; the most recent reading is from June 1, 2026. Each reservoir below links to its own page with full history and seasonal context.
Massachusetts at a glance
- Reservoirs tracked
- 2
- Average fill
- 84.9%
- Water stored
- 1,533 hm³
- Combined capacity
- 1,806 hm³
- Fullest
- Wachusett Reservoir (94.2%)
- Lowest
- Quabbin Reservoir (83.4%)
- Last updated
- June 1, 2026
Frequently asked questions
How full are reservoirs in Massachusetts right now?
As of June 1, 2026, the reservoirs tracked in Massachusetts that report live levels are 84.9% full overall, holding about 1,533 hm³ of water.
How many reservoirs are there in Massachusetts?
reservoirs.earth tracks 2 reservoirs in Massachusetts, with a combined storage capacity of 1,806 hm³.
Which reservoir in Massachusetts is the fullest?
Wachusett Reservoir is currently the fullest reservoir in Massachusetts, at 94.2% of capacity.
Which reservoir in Massachusetts is the lowest?
Quabbin Reservoir is currently the lowest in Massachusetts, at 83.4% of capacity.
Where does the reservoir data for Massachusetts come from?
All storage figures for Massachusetts come from USGS · USACE · BOR · CDEC, an official source, last updated June 1, 2026.