Merrimack River at Concord, NH
River level and flood forecast · Merrimack County
The river is 10.4 ft below flood stage (14 ft).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Merrimack River at Concord to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 20 ft |
| Moderate flood stage | 17 ft |
| Flood stage | 14 ft |
| Action stage | 12 ft |
| Record crest (March 20, 1936) | 26.2 ft |
What floods at each level
From the National Weather Service, highest first.
- 18 ftFlooding occurs at businesses near the ice arena parking lot.
- 16 ftThe parking lot on the east bank downstream of the Route 9 bridge floods.
- 14 ftLowland flooding occurs.
- 12 ftMinor lowland flooding begins.
Highest crests on record
- 26.2 ft — March 20, 1936
- 23 ft — September 22, 1938
- 20.8 ft — November 5, 1927
- 15.12 ft — May 15, 2006
- 14.4 ft — April 4, 1951
Recent crests: 15.12 ft (May 15, 2006) · 11.86 ft (April 6, 2005) · 12.53 ft (April 15, 2004) · 11.31 ft (March 31, 2003) · 12.37 ft (April 16, 2002)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (CONN3); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.