Army National Guard Site ID#: AZHQ-009-R-01

Location

The Arizona Army National Guard (ARNG) Maroon Crater Artillery Range Munitions Response Site (MRS) is located approximately 7 miles northeast of Flagstaff, Coconino County, Arizona within Coconino National Forest’s San Francisco Volcanic Field. Maroon Crater MRS is a Non-Department of Defense Owned, Non-Operational Defense Site. The 12,177 acres of formerly-used artillery range land is owned by the U.S. Forest Service | View Map >

Contaminants of Concern (COCs)

The contaminants of concern include munitions and explosives of concern and associated munitions constituents. Contaminants of concern at the site may change as new data become available.

Munitions | Do not approach, pick up, touch, or move suspected ordnance, munitions, or explosives debris as serious harm could result.

Action Taken

Maroon Crater was utilized for artillery training of howitzers, mortars, and machine guns from 1948 to 1950. The firing points are unknown for the mortars and machine guns. Historical documents indicate the howitzer firing point was located on the western edge of the MRS and directed east toward an impact point on Maroon Crater.

• Community Relations Plan completed in 2020
• Remedial Design / Remedial Action Plan completed in 2021
• Remedial Action field activities completed in 2023
• Remedial Action Completion Report completed in 2024

Status

Surface and subsurface clearance for munitions items was completed in 2023 within accessible areas. Given the limitations of the technology and the presence of vegetation, the risk of a missed munition item is minimal but not negligible. Consequently, warning signs have been installed along the trails accessing the former range.

This site is subject to programmatic five-year reviews and the next review will be conducted in 2029.