Water main replacement begins along East Road near Los Alamos airport

Drivers on East Road faced the start of a major utility project Monday as Los Alamos County began replacing a 14-inch water transmission main across from Los Alamos Airport, with work expected to stretch through the fall.

The county said construction will stay primarily south of the east-bound shoulder on N.M. 502, so the roadway should remain largely usable. Even so, motorists were urged to slow down and use caution near the Fire Station 6 entrance and the first curve before the Canyon Rim trailhead, where barrels and concrete barriers will be in place to protect travelers and give crews room to work.

What is getting replaced is not just pavement or roadside hardware. Los Alamos County Department of Public Utilities is swapping out about 6,700 linear feet of 14-inch steel pipe installed in 1949 for new 14-inch ductile iron pipe. County project documents say the existing line is aged, deteriorated and experiences regular leaks.

The transmission main is a critical part of the county system, carrying water from Otowi Well #4 to the Townsite area of Los Alamos. The county listed the project budget at $2,883,500, with $2,500,000 from the Water Trust Board and $383,500 from county CIP funds.

Traffic impacts are expected to be limited for most of the job because much of the work will happen off the road, but county officials said the portions closest to the highway could still create minor delays when crews and equipment are active. East Road is a key corridor for airport access, recreation traffic and everyday commuting, making even short slowdowns noticeable for drivers heading to the airport area, Fire Station 6 or the Canyon Rim trailhead.

The replacement also fits into a broader water-supply push inside Los Alamos County. Utility planning documents say the county provides water for Los Alamos, White Rock, Los Alamos National Laboratory and Bandelier National Monument. They also note that the county has shut down its highest-producing water well because of groundwater contamination, while LANL’s Site Wide Environmental Impact Statement projects a significant increase in water use. In that context, the East Road project is part of a larger effort to keep the county’s water system reliable, even as demand and supply pressures grow.