Fire officials on Sunday said they expect to have 100 percent containment by dayâs end on a wildfire burning grass and brush near Grouse Creek in Box Elder County. The wildfire â which started at 1 p.m. Saturday afternoon â burned 703 acres and was 80 percent contained by Sunday afternoon, according to spokesman Mitch Zundel. Flames had burned up a hill, then split into two directions, threatening six structures â including houses â but crews prevented any of the buildings from burning, Zundel ... <iframe src="http://www.sltrib.com/csp/mediapool/sites/sltrib/pages/garss.csp" height="1" width="1" > </frame>