| 40.0 | THIS IS A DISASTROUS...LIFE THREATENING FLOOD. THIS COMPARES TO THE GREAT NEW ENGLAND FLOOD OF 1936. FOLLOW THE ADVICE OF LOCAL OFFICIALS...AND EVACUATE IF TOLD TO DO SO. | | 35.0 | THIS IS A MAJOR...LIFE THREATENING FLOOD EVENT. THE RIVER HAS NOT REACHED THIS HEIGHT SINCE THE GREAT NEW ENGLAND FLOOD OF 1936. MAJOR FLOODING WILL AFFECT THE COMMUNITIES OF MERRIMACK AND LITCHFIELD THROUGH NASHUA AND HUDSON. FOLLOW THE ADVICE OF LOCAL OFFICIALS...EVACUATE IF TOLD TO DO SO. STAY AWAY FROM THE MERRIMACK RIVER. | | 30.0 | THIS FLOOD COMPARES TO THE HURRICANE OF 1938 FLOOD. THIS IS A SUBSTANTIAL FLOOD EVENT. FOLLOW THE DIRECTIONS OF LOCAL OFFICIALS...EVACUATE IF TOLD TO DO SO. AT THIS HEIGHT THE MERRIMACK RIVER IS MOVING VERY SWIFTLY. STAY AWAY FROM THE RIVER. | | 28.0 | THE RIVER HAS NOT REACHED THIS HEIGHT SINCE THE HURRICANE OF 1938. THIS IS A SERIOUS FLOOD EVENT. FOLLOW THE ADVICE OF LOCAL OFFICIALS...EVACUATE IF TOLD TO DO SO. AT THIS HEIGHT...THE MERRIMACK RIVER IS MOVING VERY SWIFTLY. STAY AWAY FROM THE RIVER. | | 25.0 | THE RIVER HAS NOT REACHED THIS HEIGHT SINCE MAY 2006. THIS IS A SIGNIFICANT FLOOD EVENT. FOLLOW THE ADVICE OF LOCAL OFFICIALS...EVACUATE IF TOLD TO DO SO. | | 21.0 | FLOODING WILL OCCUR IN LOW LYING AREAS FROM LITCHFIELD AND MERRIMACK...TO HUDSON AND NASHUA. | | 18.0 | FLOODING WILL BEGIN IN THE LOWER LYING SECTIONS OF HUDSON AND NASHUA AS THE RIVER CONTINUES TO CLIMB ABOVE 18 FEET. |
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1) 41.30 ft on 03/20/1936
2) 30.50 ft on 09/23/1938
3) 26.00 ft on 05/15/2006
4) 23.50 ft on 04/17/2007
5) 22.40 ft on 04/07/1987
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1) 2.00 ft on 08/08/1941
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