A Tuesday morning house fire in a neighborhood south of Issaquah spread to other structures and reportedly forced a nearby preschool to evacuate, officials said. Crews battling the blaze were hampered by an inconsistent water supply, said Capt. Steve Johnson of Eastside Fire and Rescue. Firefighters initially responded to the scene, in the 23800 block of SE Tiger Mountain Road, at around 10 a.m. after receiving reports of smoke and flames billowing from a home there. The occupants of the home got safely out, but the fire kept spreading beyond the house to the surrounding trees and then to at least one other structure.