Officials for the Whisky Creek Fire in the Mount Hood National Forest’s Mark O. Hatfield Wilderness say cloud cover, increased humidity, and light precipitation today should limit growth of the fire and minimize smoke production.  The forecasted rain is not expected to impact the fire, which is at 891 acres in size with no containment.  Crews continue to prepare containment lines and clear roads and trails to the south along the Rainy-Wahtum Trail #409 from Rainy Lake to Wahtum Lake and continuing to the Pacific Crest Trail approximately one mile to the 2017 Eagle Creek Fire burn area.  Crews are clearing thick brush along roads with the assistance of masticators to create fire breaks.  To the east of the fire, crews continue to strengthen containment lines working toward Hood River County Forestry’s Kingsley area.  The Forest Service announced Sunday that aerial fire retardant has been approved for use in the Mount Hood National Forest to battle the Whiskey Creek fire.  Chemicals could be dropped in and around the Mark O. Hatfield Wilderness area’s boundary within the national forest.  Aerial retardant drops are usually prohibited in areas designated for protected species, cultural resources or waterways, but can be used to protect valuable resources such as old-growth forests and habitat for endangered and threatened species.  Management of the fire has been transitioned to the Central Cascades Interagency Management Team.