Photos: Fast-moving Sockeye Fire displaces Susitna Valley residents

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Red fire retardant is dropped from a plane on one edge of the Sockeye Fire near Willow on Monday evening. The Sockeye Fire continued to burn near Willow, Alaska, on Monday, June 15, 2015.

Officials were in the Willow area Monday trying to determine the extent of damage from the Sockeye Fire, which scorched a destructive path through the area, while the fire continues burning into a second day, heading south.

An ever-expanding 15-mile evacuation corridor runs along the Parks Highway from north of Willow down to the Nancy Lakes area, with some 1,700 residential structures inside its perimeter, according to an update posted early Monday by the Matanuska-Susitna Borough and Alaska Division of Forestry, which administers the state's firefighting forces.

Read more: Officials assessing damage in Susitna Valley from fast-moving Sockeye Fire