State · United States · USGS · BOR · USACE · CDEC
Massachusetts
80.9% average fill
Measured
2
Volume stored
1,461 hm³
Measured capacity
1,806 hm³
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Reservoirs
Sorted by capacityQuabbin Reservoir
Updated 2026-09-01
Wachusett Reservoir
Updated 2026-09-01
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 17 days old — the official source may be delayed. Figures below may not reflect today’s levels.
About reservoirs in Massachusetts
As of September 1, 2026, the reservoirs we track across Massachusetts that report live levels hold roughly 1,461 hm³ of water — about 80.9% 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 92.4%, while Quabbin Reservoir is the lowest at 79.1%.
Storage figures for Massachusetts come from USGS · USACE · BOR · CDEC; the most recent reading is from September 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
- 80.9%
- Water stored
- 1,461 hm³
- Combined capacity
- 1,806 hm³
- Fullest
- Wachusett Reservoir (92.4%)
- Lowest
- Quabbin Reservoir (79.1%)
- Last updated
- September 1, 2026