Road Construction
Contact Info

The Cone Zone: Week of Sept. 28, 2020


Dept. of Public Utilities:

Trinity Drive at 15th Street Intersection – Utilities’ work

Natural Grocers’ contractor continues to work on the south side of Trinity Drive in preparation of utility tie-ins.  One eastbound lane between 20th and 15th Streets is dropped. Some traffic delays expected.


Public Works Dept.:

Barranca Mesa 3 Subdivision Improvements Project

TLC Plumbing and Utility continues construction activities. Crews continue preparing Camino Encantado for paving, which should begin next week.


Diamond Drive near the Golf Course

Construction activities continue near the golf course that may result in lane closures.


Lane Closure on Sherwood Blvd

Work continues for a water line tie-in and motorists may see a lane closure and flagging operations on Sherwood Blvd because of work on the Pinon Park Splash Pad project.


Pedestrian and ADA Accessibility Along Trinity Drive from Oppenheimer to 39th Street

GM Emulsion continues construction along Trinity Drive removing curb and gutter and dilapidated asphalt in the buffer zone between curb and sidewalk. Construction crews plan to continue placing new curb and gutter and colored concrete in the buffer space the week of Sept. 28. Work in the area of Trinity 301 Apartments near Oppenheimer will include a partial closure to their driveway entrance as crews replace the valley gutter in sections. Access to the apartment building will be maintained.


Traffic & Streets Division:

Deer Trail, Deer Ct., and Terry Ln – repair work

Crews will be repairing manholes, curb and gutter, and performing other concrete work.  A flagging operation will be in place during work hours Monday – Friday from 8:30 a.m. to 3:30 p.m.


Other projects:

NM502 Roundabout Construction & Road work (State DOT, Star Paving)


No change to traffic control from last week. There is one lane open in each direction from Tewa Lp to DP Rd. Access to local streets from Tewa Lp to Arroyo Ln will still be provided.


Access to Central Ave and 4th St from NM 502 remains closed for the next 2 weeks for construction of the roundabout. Central Ave and 4th St can still be accessed via Knecht Street.


For updates from the State, visit 


DP Rd (Work related to Canyon Walk Apts and The Bluffs)

Qualcon Builders, LLC - 120 DP Road Utility Infrastructure Replacement

Phase 1 of construction began September 14th and will continue for approximately 10 weeks.

After installation of a storm drain pipe last week on the eastern boundary, upcoming work the week of Sept. 28 includes trenching for placement of the sewer line along the north side of the section of DP Rd from Trinity Drive to the Canyon Rim Trail Crossing. During these trenching activities, portions of DP Rd will be restricted to one lane traffic, controlled by a flagged/signaled system. Access to businesses will be maintained.


Vehicles and pedestrian traffic are urged to follow all traffic control devices and maintain a safe distance from the work zones listed above.


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Here is a map of the phase 1 and 2 construction on DP Rd

Sign up for Cone Zone to be delivered to your e-mail on Fridays – link to the Subscribe to Newsletter option at the bottom of the County’s website at


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 through November, with special emphasis on public outreach for the NM502 Roundabout project, which is being constructed by the State of New Mexico's Department of Transportation. Construction started last year and wraps up by Dec. 2020 in Los Alamos. 

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

Here is a link to the NMDOT webpage for all District 5 Proposed and Active Projects with additional information from the State. Scroll past all Proposed projects to the bottom of the page where you will see NM502 listed as an Active project. The State has posted additional information about roundabouts on this page, along with the March 20, 2019 public meeting presentation. The presentation shows many aspects and views of the construction project and detours that can be anticipated as it proceeds over the next two years. 

Nearby projects:

Repaving of NM502 from Tewa Lp east to County Line
The roadway is in need of repaving and the State DOT anticipates that project will occur this year, likely in concert with the Roundabout construction. 

N3B - TA-21 Clean Up
N3B and their contractor are working in 2020 and 2021 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. Truck traffic on DP Rd and Trinity or NM502 is expected to be minimal at least until Fall 2020. 

Future DP Road Infrastructure (long-term County project)
The County is installing the first part of infrastructure for the DP Road area in 2020, 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 long-term plan is for infrastructure to 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 Council approved funding for this project for FY21, and the scope of the project is being determined. Public meetings will be held, especially with those businesses located along DP Rd, to include them in the early planning and design of the DP Rd area. 

What else do I need to know?

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.

To view traffic in various areas around Los Alamos and White Rock visit our new page
camera views around town

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

Below is a listing of projects that motorists WILL or 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 still scheduled to go to construction later this year. 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 2020 that might cause some traffic slow-downs:

Trinity Drive:

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

Hilltop house hotel - adjacent to the NM502 roundabout project. The property has been sold. No news yet on plans for redevelopment.

Construction on a new Marriott TownPlace Extended Stay Suites plus conference center at the 20th Street (all six pads) lot - the Local Economic Development Act ordinance required to complete this transaction was passed on a 5-2 vote by Council on Oct. 15, 2019. Marriott has supplied plans to the County for review as of June 2020. Further details on hotel construction will be shared on this page as info becomes available. 

Traffic light installation - a new traffic light will be installed within the next two years at 20th and Trinity Drive once the Marriott hotel listed above is constructed. 

New business construction or renovation along Trinity Drive will continue: Natural Grocer store - construction is underway at the Shriner's Club lot; Wendy's - this project was canceled in June 2020 - no updates about what will happen with the site. The original plan was for Wendy's to raze the old McDonald's and rebuild on that lot.

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.