Interest in the use of sprinklers to support wildfire operations has generated questions about how they affect fuel moisture. Fire managers use fuel moisture to assess the availability of organic matter for fires to burn. This report documents the amount of water distributed and fuel moisture changes from sprinkler watering treatments using a loop sprinkler system. It is recommended that feather moss (0-5 cm) and upper duff
(5-13 cm) in lowland boreal forests receive 10 and 20 mm of sprinkler watering to raise moisture near saturation levels for a 24-hour period. If sprinklers were combined with fuel treatments and prescribed fire, they could help manage forest dynamics by controlling the spread and intensity of wildfires around assets.