Road Construction
Contact Info
The Cone Zone - Wk of March 25:
NM502 Roundabout & Road Reconstruction (re-posted press release from NMDOT)

On March 18, crews from Star Paving Company began installing construction signs and traffic devices signaling the start of the reconstruction of NM 502, aka East Road and Trinity Drive. Work will also include installation of a roundabout at the intersection of Trinity Drive, Central Ave. and 4th Street.
For the safety of workers and the public, the speed limit is reduced from 35 mph to 25 mph within the project limits - this transition occurs just west of Knecht Street and just east of Tewa Loop.
First Phase
Over the next 3 to 4 weeks, crews will be removing center medians and clearing areas on the north side of NM 502 between DP Road and Tewa Loop. Crews will then pave these areas for use as a traffic detour for the next construction phase. During this time and weather permitting, motorists should expect the following:
  • Monday thru Friday, between 9 AM and 4:30 PM, expect delays due to intermittent lane closures and flagging operations necessary to provide safe and sufficient work area for crews, equipment, motorists and pedestrians. Traffic will be stopped for short durations for one lane passage through the work zone.
Second Phase
Upon completion, significant changes to traffic will occur as follows:
  • Between DP Road and Tewa Loop, traffic lanes on NM 502 will be shifted to the north. One lane in each direction (westbound and eastbound) will be maintained. However, due to limited space, no left turn lanes will be provided.  
  • Access to Canyon Road via NM 502 will be detoured and limited to local traffic only
  • Westbound NM 502 traffic will be detoured onto Central Ave. which will result in the following:
    • Access back to NM 502 may obtained via Knecht St. or 15th Street
    • Access to DP Road via westbound NM 502 will be detoured to Central Ave. and Knecht St., then back to eastbound NM 502
  • NM 502 between DP Road and Central Ave. will become one-way in the eastbound direction and intersect Central Ave. at a stop condition.
  • Eastbound NM 502 will be reduced to one lane at 6th Street.
  • This phase will allow for the construction of the southern portion of NM 502 and is scheduled for completion mid-November.
Final Phase
Construction of the north half of the road construction will start in March 2020 and scheduled completion of the Project is mid- November 2020, weather permitting.    More information on traffic advisories are forthcoming.

Traffic Advisories and updates on this project will be posted on the New Mexico Department of Transportation's road conditions website,

Future advisories will only include weekly info on the First Phase and traffic impacts, not the entire scope of all phases. 
Diamond Drive Asphalt Repair (Public Works/Traffic Division)
Traffic crews will be patching potholes on Diamond next week, starting on Monday. Work will begin near Trinity and Canyon and proceed to the San Ildefonso roundabout in the northbound lanes. Motorists should expect a moving single lane closure indicated by a digital arrow board. Please slow down in the work zone and follow all temporary construction signage. It is anticipated work will be completed by Friday March 29th - weather dependent.
Camino Cereza and Camino Mora (CableCom)
Beginning Monday, motorists traveling along these two streets on North Mesa may see CableCom performing some underground cable work. Project should be limited to the should and have little to no impacts on traffic. Work will continue intermittently through April 2. 
Advance Notice: Tsikumu Village Road Improvements (Public Works/Traffic Division)
The County's contractor, Albuquerque Asphalt Inc., will begin construction on this road project on April 1. Proposed improvements include: mill existing asphalt pavement surface, overlay with new asphalt and install concrete valley gutters. There will be limited concrete replacement (approximately 5%) of sidewalks, valley gutters, curb and gutter, fillets, drive pads and ADA curb ramps at designated locations on these streets: Sioux, Cheyenne, Seminole, Iroquois, Yuma and Ute. Work hours will be Monday through Friday 8 a.m. to 5 p.m. Access to residents as well as services such as mail delivery, emergency services, trash and recycling/yard waste pickup will be maintained. 
Please contact Public Works with any special access needs. 662-8150 or
Jemez Springs Commuters: Bridge Replacement (reposted from NM DOT)
State of NM contractor (Structures, Inc.) will be starting a bridge replacement project next week. They will begin removing large boulders and rock to make way for a new bridge on NM4 near Mile Marker 19, just north of Jemez Springs. No road closure is expected unless there is an emergency due to large rock removal.  

About this page...
This page provides citizens with basic information on County and non-County road construction projects. We are maintaining the page in the interest of keeping our citizens, visitors and commuters informed as a public service with one landing page where all information or links to information can be found.

About the Cone Zone...
The weekly Cone Zone report is posted here at the top of the page on Friday afternoons from March 8 through November 15, 2019, and then again from March through November 2020, in order to support public outreach especially for the NM502 Roundabout project, which is being constructed by the State of New Mexico's Department of Transportation over two construction seasons in Los Alamos. If you don't want to bookmark and visit this page on Fridays, you can sign up to receive the Cone Zone report in your e-mail in-box - link to Subscribe to Newsletters here.

More about the State of NM DOT's NM502 Reconstruction & Roundabout Project...

Here is a project map showing projects in the area of NM502 and the roundabout/near DP Road which may cause additional traffic congestion heading into the busy summer months. Motorists are asked to use caution in this area. Staging for the equipment and infrastructure needed for the NM502 project (a fenced, secure area for Star Paving) is located on DP Road, as shown on this map.

Here is a project drawing showing what the NM502 Roundabout will look like when completed (furnished to the County by the State of NM DOT)

Due to utilities conflicts along NM502 for the new roundabout to be constructed, new storm sewer, retaining walls and grade changes associated with the new road design, infrastructure for water, sewer, electric, natural gas and fiber optics will be replaced and relocated as follows:

• Replace and relocate 2000 feet of water transmission line
• Replace and relocate 4500 feet of water distribution lines, including all service connections and fire hydrants in the corridor
• Replace and relocate 4000 feet of natural gas lines including all services lines in the corridor
• Replace and relocate 350 feet of sewer lines
• Replace and relocate 5000 feet of underground electric lines, including duct banks, conductors, transformers, vaults and all service connections in the corridor
• Replace and relocate 1400 feet of the fiber optic systems owned by Los alamos County and Comcast

Nearby projects:
N3B - TA-21 Clean Up
N3B and their contractor will be working this year and next year on an environmental remediation/clean up project at the former TA-21 site (far eastern edge of DP Rd).

Here is a Fact Sheet about that N3B project which involves hauling away non-radioactive or low-level waste after properly packaging it in containers.

Infrastructure for Bethel Housing Developments - installation on or along DP Road:
Bethel Development's “Canyon Walk” apartments will be starting infrastructure and construction of new affordable workforce housing, scheduled to begin August 2019 with completion by August 2020. A second housing project by Bethel called “The Bluffs” on DP Road is also being considered and work could begin for additional Senior Housing. Both of these sites are referenced in the main NM502 project map shown above.

Future DP Road Infrastructure (long-term County project)
The County could begin installing infrastructure for the DP Road area in the future, as more land parcels become available and after TA-21 remediation is completed. These parcels are part of DOE Land Transfers that could be used for future light industrial or residential development. The infrastructure would extend to the TA-21 site as a "spine" for future development on the north and south side of the road. DP Road needs to be upgraded to include basic infrastructure that could be used by existing or new businesses or homes. For example, there is currently no sewer line in this area. The County applied for grant funding last year for offsetting these types of infrastructure costs for the DP Road project, but it was not approved.

What else do I need to know?

The County is working on "Frequently Asked Questions" about the projects occurring in the vicinity of NM502/DP Road. Watch for that document to be posted as a PDF here on the webpage later in March.

Links to other entity websites for projects will be featured here for convenience as they become available.

For general questions about construction, you may call the Customer Care Center at 505-662-8333 and a representative will direct your call to the appropriate office. 

For feedback on this webpage, send an e-mail to the webpage administrator.

What's next? A note about planned or possible future road projects:

Below is a listing of projects that motorists might see occurring in Los Alamos that might further impact NM502/Trinity Drive:

Canyon Rim Trail Underpass:

An underpass to connect LA Mesa trail underneath NM502 and south to the Canyon Rim Trailhead is at the design stage and may begin construction Spring 2020. It is located further east from the NM502 project. 

Work in Los Alamos on various projects by the County or by others may get underway in 2019 or 2020 that might cause some traffic slow-downs:

Trinity Drive:
There could be several projects occurring over the next two years while NM502 is under construction at the eastern edge of Los Alamos:

Construction on new businesses/buildings at the 20th Street lot (new Starbucks)

Traffic light installation at 20th and Trinity Drive once new businesses are constructed.

Changes to Trinity Drive near the LA Medical Center for better access to the former DOE/LASO site where new apartments known as "The Hill" are expected to be built

New business construction along Trinity Drive (Natural Grocer is expected to build a store at the Shriner's Club lot)

Diamond Drive:
Reconstruction of the road from Trinity Drive to the San Ildefonso roundabout by the Golf Course could occur. The County has applied for emergency funds for road repairs after several harsh winter snow events in December and January damaged Diamond Drive. Temporary asphalt repair is underway, but it is not intended to be a long-term fix for Diamond Drive. Work on Diamond to repave the road could get underway this summer if funded.

SR4/Truck Route intersection:
This has been a high-profile project for several years - there are design plans in progress but no funding set aside for construction. At this time, and because of the impact that will already occur for increased traffic on SR4/Truck Route during the NM502 project for two years, it is not anticipated that there would be road work on the intersection at the same time.

Watch for updates on this page for Future Projects such as the ones listed above, or, for new projects to be added as they are identified. As the County gets more details, updates will be posted here.

Construction can be difficult and present special challenges for businesses caught in the construction zones and related/adjacent areas. Motorists tend to avoid orange barrel zones and this can have significant economic impacts on businesses. Los Alamos has many small, locally-owned and operated restaurants, specialty shops and stores on the eastern edge of Los Alamos. The County encourages residents and visitors to support local businesses, especially those on DP Road, which will likely be impacted by the construction. Other businesses at Entrada Business Park, East Gate, along Trinity/Knecht (Mari Mac and Smith's Marketplace and further west on Trinity) as well as those on Central Avenue may likely be impacted, too. The County is working with MainStreet and the Chamber of Commerce to find ways to mitigate impacts and support them, but your help is urgently needed! Allow extra time for patronizing these businesses, but please don't shy away just because of construction! They need your help to continue to operate all of your favorite and valued restaurants, shops and other small businesses to be able to provide you great products and services.