National park crowds across the West are braving intense heat and fire dangers Christopher Rowland, Justin Franz, Ari Schneider and Deby Dixon, The Washington Post July 18, 2021 FacebookTwitterEmail Isaiah Sullivan, the rental manager for the Glacier Park Boat Co., helps kayakers get into the water at Lake McDonald in Glacier National Park, Mont., on July 16. The Livingston Range in the distance is obscured by smoke from wildfires around the Pacific Northwest.Photo by Justin Franz for The Washington Post. GLACIER NATIONAL PARK, Mont. - Isaiah Sullivan can measure the intensity of this year's hot summer by the lines of visitors outside the boat rental business he manages on the shores of Lake McDonald. Once the afternoon heat intensifies, the line to paddle on cool water fed by melting snowpack doesn't dissipate until he puts out the closed sign at 7 p.m.