RENO, Nev. - Rainfall is helping temper a Nevada wildfire that has destroyed 22 homes north of Carson City but creating new concerns about flooding.

Fire officials said Sunday that wet weather over the last two days has bolstered efforts to contain the blaze burning in the Washoe Valley.

The 5.3-square-mile fire is now 20 percent contained. Crews say they have managed to keep the fire away from 480 homes. Still, 500 structures remain threatened and mandatory evacuations are still in place.

The public is being advised to stay away from the area due to the possibility of rock falls or debris flows.

The so-called Little Valley fire began early Friday. The cause is under investigation.