Merrimack River - Artichoke Reservoir Entrance UV IndexUnited StatesMAEssex CountyMerrimack River - Artichoke Reservoir Entrance1-Day3-Day Graph Plots Open in Graphs UV Forecast NOAAMerrimack River - Artichoke Reservoir Entrance UV forecast issued yesterday at 2:17 pm. Next forecast at approx. 2:17 pm.Get WillyWeather+ to remove ads