Army Rocky Mountain Arsenal

What's New?

Known today as an urban national wildlife refuge, the Rocky Mountain Arsenal is one of the most studied environmental cleanup sites in the country.  The U.S. Army permanently manages approximately 1,000 acres at the site to ensure the remedy remains protective of public health and the environment. Explore this site to learn more about the operation and maintenance of the environmental cleanup. To learn more about the national wildlife refuge, visit the refuge online.                                      

Annual Highlights from Rocky Mountain Arsenal

Rocky Mountain Arsenal has recently published its annual community report. This new publication offers highlights from the past year, along with news about upcoming projects scheduled for 2022. To read the report, click here. (La hoja de datos también está disponible en español aquí.)


Final Fifth Five-Year Review Report Now Available

The final Fifth Five-Year Review Report for Rocky Mountain Arsenal (RMA) is now available. The review covers the period from 2015 to 2020.

The U.S. Army conducted the Five-Year Review in cooperation with the EPA, Colorado Department of Health and Environment and Tri-County Health Department. The purpose of the review was to assess the protectiveness of the cleanup for human health and the environment. A multiagency team also evaluated whether any changes had occurred to environmental standards that affect the site.

You can review the full report here. To learn more about the Five-Year Review (FYR) process, click here to access the fact sheet. (La hoja de datos también está disponible en español aquí.)

If you would have any questions about the final Fifth Five-Year Review Report, please email them to: or call the Public Affairs Office at 303.289.0300




Rocky Mountain Arsenal

6550 Gateway Road

Commerce City, CO 80022-1748

Public Affairs

For further information, contact: