PROVO — One person was injured when his vehicle slammed head-on into a boulder the size of a tractor tire that came crashing down onto U.S. 189 in Provo Canyon Wednesday morning, the Utah Highway Patrol said.
The man was transported by ambulance to Heber Valley Hospital, a UHP sergeant said. The incident occurred shortly after 9 a.m. at milepost 23 above the south shore of Deer Creek Reservoir in an area where cliffs rise quickly at the side of the road. About the same time, another slide of smaller rocks came tumbling off the mountain at milepost 18 and were struck by a pickup truck, which sustained a flat tire.
The UHP closed the road for about an hour and a half while the Utah Department of Transportation cleared it of debris and pooling water, caused by plugged drainholes, the UHP said.
About 6 a.m. five other vehicles were damaged in another rock slide. Rock slides in Provo Canyon are a constant winter driving hazard, the UHP said.