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Total streamflow across the
Merrimack River
was last observed at
23,640
cfs, and is expected to yield approximately
46,889
acre-ft of water today; about 78%
of normal.
Average streamflow for this time of year is
30,278 cfs,
with recent peaks last observed
on
2023-12-20 when daily discharge volume was observed at
88,890 cfs.
Maximum discharge along the river is currently at the
Merrimack River Bl Concord River At Lowell
reporting a streamflow rate of 10,300 cfs.
This is also the highest stage along the Merrimack River, with a gauge stage of
44.76 ft at this location.
This river is monitored from 3 different streamgauging stations along the Merrimack River, the highest being situated at an altitude of 269 ft, the
Merrimack River At Franklin Junction.
| Last Updated | 2025-04-27 |
| Discharge Volume | 46,889 ACRE-FT |
| Streamflow |
23,640.0 cfs
+7600.0 cfs (+47.38%) |
| Percent of Normal | 78.08% |
| Maximum |
88,890.0 cfs
2023-12-20 |
| Seasonal Avg | 30,278 cfs |
The Merrimack River (or Merrimac River, an occasional earlier spelling) is a 117-mile-long (188 km) river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Gulf of Maine at Newburyport. From Pawtucket Falls in Lowell, Massachusetts, onward, the Massachusetts–New Hampshire border is roughly calculated as the line three miles north of the river.
The Merrimack is an important regional focus in both New Hampshire and Massachusetts. The central-southern part of New Hampshire and most of northeast Massachusetts is known as the Merrimack Valley.
Several U.S. naval ships have been named USS Merrimack and USS Merrimac in honor of this river. The river is perhaps best known for the early American literary classic A Week on the Concord and Merrimack Rivers by Henry David Thoreau.
