Head-on crash closes NM 502, delays Los Alamos commuters

A head-on crash shut NM 502 in both directions at mile marker 13 and immediately rippled through Los Alamos, forcing commuters, Los Alamos National Laboratory workers, school pickups, deliveries and other trips to find another way out of the county.

The Santa Fe Sheriff’s Office notified Los Alamos police of the closure after the collision, which was reported with injuries. The crash happened about 3 miles east of NM 30 and 2 miles west of Pojoaque High School, squarely on a stretch of highway that serves as a daily connection between Los Alamos County and the Pojoaque and Santa Fe areas.

By later reporting, the crash had turned fatal, and a 96-year-old woman died. Santa Fe County advised westbound traffic on State Road 502 to detour via Española to State Road 30. Eastbound drivers coming from Los Alamos were told to use State Road 30 or State Road 4 to bypass the closure.

For Los Alamos, the disruption underscored how few practical alternatives exist when NM 502 is blocked. The corridor carries workers, parents, delivery vehicles and visitors in and out of the county, so even a crash outside the county line can change the timing of an entire afternoon. When the road shuts in both directions and the reopening time is unknown, the impact reaches well beyond the scene itself, with delays spreading to shift changes, appointments and school routines.

The New Mexico Department of Transportation says it provides road conditions, maps, travel alerts, rest areas and transit information for New Mexico travelers, and it maintains crash-record systems and traffic-crash data for research and safety analysis. NMDOT also describes NM 4 as an important east-west route connecting White Rock in Los Alamos County to NM 502, giving heavy trucks a bypass and providing alternate access to Los Alamos National Laboratory. That connection shows how closely tied the region’s roads are, and how quickly one closure can expose a wider mobility weakness.

The May 6 closure was not the first NM 502 crash to disrupt travel. A separate head-on collision on Main Hill Road in September 2024 closed the road until it reopened later, and another crash in April 2025 involved multiple vehicles near East Road and NM 502. Together, those incidents show that when NM 502 goes down, Los Alamos feels it fast.