A rock slide triggered by heavy downpours along Highway 243 north of Idyllwild Tuesday propelled a boulder onto the mountain corridor, blocking one side of it.
The slide was reported about 12:15 p.m. on the southbound side of the two-lane highway, near Twin Pines Road, roughly halfway between Idyllwild and Banning, according to the California Highway Patrol.
Motorists encountering the big rock were forced to navigate around it. No injuries were reported, and there were no indications of damage to vehicles, according to the CHP.
It was unclear whether the roadway had sustained damage.
The slide occurred as storm cells plowed through the area.
CHP officers and Caltrans crews were en route to the location as of 12:30 p.m.