Merrimack Karate Merrimack Karate 534 D.W Highway, Merrimack NH,   424-7458                  ©  Merrimack Karate 2012 We close when Merrimack schools close, with the exeption of school vacations  In case of inclement weather, we will post school closings here by 3:00 pm the day of the closing. Cancellation of classes will also be announced and posted on WZID 95.7