RIVER GAUGE · MERRIMACK RIVER
Merrimack River at Concord
Merrimack County, New Hampshire
Water level3.46 ft
Flow2,660 cfs
Last readingSep 16, 2026, 4:30 PM UTC (last recorded)
Action12 ft24,000 cfs
Minor flood14 ft31,050 cfs
Moderate flood17 ft43,000 cfs
Major flood20 ft60,000 cfs
The past week
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What floods at each level
- 18 ft
Flooding occurs at businesses near the ice arena parking lot.
- 16 ft
The parking lot on the east bank downstream of the Route 9 bridge floods.
- 14 ft
Lowland flooding occurs.
- 12 ft
Minor lowland flooding begins.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Mar 19, 1936 | 26.2 ft | — |
| Sep 21, 1938 | 23 ft | — |
| Nov 4, 1927 | 20.8 ft | — |
More on Merrimack River
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