RIVER GAUGE · SOUHEGAN RIVER
Souhegan River at Merrimack
Hillsborough County, New Hampshire
Water level2.49 ft
Flow68 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action8 ft3,790 cfs
Minor flood9 ft
Moderate flood11 ft
Major flood13 ft
The past week
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What floods at each level
- 13 ft
Significant flooding affects homes in the area of Beacon Drive in Merrimack. Other low lying sections upstream into Amherst and Milford experience flooding.
- 11 ft
In Merrimack, homes in the Beacon Drive area flood. Other low lying areas upstream into Amherst and Milford flood.
- 10 ft
In Merrimack, several homes along a small portion of Beacon Drive begin to flood. In Amherst, low lying areas begin to flood.
- 9 ft
Flooding of low lying areas along the river begins in the town of Merrimack.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Mar 18, 1936 | 16.2 ft | 16,900 cfs |
| Sep 20, 1938 | 12.78 ft | 10,800 cfs |
| Apr 17, 2007 | 12.71 ft | 10,500 cfs |
More on Souhegan River
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