Main Hill is open, rock slide near Anderson Overlook is cleared

Published on December 26, 2025

UPDATE: 12/26/25 at 8:20 a.m.: Main Hill Road has been cleared and is open.  

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12/26/25 @7:30 a.m.: The Los Alamos Police Department (LAPD) report that both east and westbound lanes of NM 502, main hill, are closed due to a rockslide near Anderson Overlook.

LAPD officers are on scene and the New Mexico Department of Transportation is en route. Traffic is being rerouted to East Jemez Road or the Truck Route. 

At this time, there is no estimated timeline for when the roadway will reopen. Updates will be provided as more information becomes available.