Around 11:30 a.m. on April 11, 2009, a rock fall impacted the area of 1500 North and 1550 East in Provo, Utah.
One rock-fall boulder damaged the outside of a playhouse located at 1522 North 1550 East, and another, larger boulder severely damaged a vacant house at 1496 North 1550 East.
The April 11, 2009 rock fall occurred one lot north of the May 12, 2005 “Y” Mountain rock fall.
The rock fall occurred shortly after a storm on April 8-9 that dropped 1.5 inches of precipitation in less than 18 hours at the Cascade Mountain Snotel site, 3 miles southeast of the rock-fall source area.
Impact craters (bounce marks) evident on the slope above the houses indicate several rocks traveled downslope. The rocks traveled an estimated one mile downslope, and likely achieved high velocities as they bounced and rolled.