A Mt. Hood National Forest spokesperson says firefighters on Wednesday focused their efforts on life and safety concerns as the 120,000-acre Riverside Fire moved an additional four miles down the Clackamas River corridor towards the communities of Estacada and Springwater.   Numerous crews worked overnight to continue point protection efforts on homes and infrastructure in the area and along Highway 211.    As of early Thursday morning, firefighters estimated the fire remained approximately two air miles from the community of Estacada, where a Level 3 “Go Now” evacuation order remains in place.  Fire managers today are assessing locations to stop forward growth of the fire, looking to take advantage of forecasted lighter winds during the afternoon to conduct air operations.  But they caution changing wind directions throughout the day could spur additional fire growth in multiple directions.