Aggregate Resource Mapping

Aggregate resources are essential to Minnesota's infrastructure and economy. We rely on construction aggregate materials as the key ingredients in our roads, bridges, airports, hospitals, playgrounds and more.

“By knowing the location of aggregate, as well as having the conversation about the importance of aggregates, local and state governments can do a better job preserving and conserving natural resources.”

Statewide, up to 50% of aggregate utilization contributes to publicly funded infrastructure projects. The DNR's Aggregate Resource Mapping Program (ARMP) provides field-researched information that helps local governments and other stakeholders balance stewardship of mineral resources, the environment, and local economies.

Why map it?

Resource Mapping & County Participation

Counties are invited to join the program with passage of a Board Resolution. Contact an ARMP Coordinator to start developing your plan and receive a sample resolution. Nineteen counties have already been mapped with financial support from the Minerals Coordinating Committee and General Fund, and 17 counties have passed resolutions to join ARMP and are currently pending funding.

Map of DNR aggregate resources completed, in progress, mapped separately

Counties participating in ARMP by status. Click completed counties to view downloadable data.

map symbol - completed counties

Aitkin, Benton, Blue Earth, Carlton, Chisago, Clay, Dodge, Isanti, Itasca, Kanabec, Le Sueur, Meeker, Mille Lacs, Nicollet, Olmstead, Renville, Sherburne, Stearns, Wright, and portions of St. Louis and Lake

map symbol - counties underway

Kandiyohi, Redwood, Swift, Sibley

map symbol - counties requesting mapping

Becker, Beltrami, Cass, Chippewa, Cottonwood, Douglas, Hubbard, Koochiching, Lyon, Martin, Murray, Nobles, Pine, Rock, St. Louis, Todd, Wadena, Yellow Medicine

map symbol - counties mapped by MGS

7-County metro area


As a non-renewable resource, aggregate maps provides a permanent asset to local governments and the public. The DNR seeks to carry out a 10-year plan to complete aggregate mapping in every Minnesota county. Fully funded, this program would map 6 counties annually starting with those already requested by resolution.

DNR geologists use county-scale mapping techniques to find sand, gravel, and crushed stone resources and characterize quality. Results are typically published within 1-2 years. The information is used by local governments, citizens, land use planners, industry, and environmental groups.


ARMP publishes a suite of county-specific data products. These include a GIS data package, a countywide PDF map, and access to an interactive map application. ARMP products are free for all users.

Digital downloadIndex of digital maps and GIS data by County.  Publication dates and catalog varies.
Interactive    viewingLaunch Aggregate Mapper to explore statewide GIS data via your browser or mobile device.

Paper maps and alternative formats

Email our team or call 651-259-5959 to discuss hard copies or other resources.

Program News

Find out about the latest aggregate mapping progress below or by signing up for email notifications:



2/20/20 - Engagement grows in southwest Minnesota

Nobles and Martin Counties passed County Board resolutions in early 2020 and joined the DNR’s Aggregate Resource Mapping program waitlist.  Browse the map of county involvement and view completed maps, above.

ARMP leaders visited the Redwood County Board of Commissioners in February 2020, detailing the importance of aggregate mapping and outlining the plans for fieldwork set to begin this spring. Find details of the meeting and the work to come in reporting from the Redwood Falls Gazette.

For more information and a sample resolution to help your county get started with ARMP, reach out to an ARMP Coordinator.

1/14/20 - Mapping underway in four counties

The DNR's Aggregate Resource Mapping Program has begun mapping in Kandiyohi and Redwood Counties. Three geologists are reviewing historical data and preparing for spring 2020 fieldwork. Mapping in Swift and Sibley counties will begin fall 2020. Read more about the upcoming work courtesy of the West Central Tribune.

12/6/19 - Two counties vote to join the aggregate program

Board officials from Rock and Cottonwood counties have passed resolutions in 2019 requesting DNR aggregate maps. To date, 13 Minnesota counties have opted-in to the program, but remain unmapped until additional funding is secured. To learn more about how your county can get involved, please contact us!

5/24/19 - LCCMR to fund four county mapping projects

DNR’s Aggregate Resources Mapping Program (ARMP) is back! During the 2018/19 legislative session, the Legislative‐Citizen Commission on Minnesota Resources (LCCMR) approved a funding proposal that will rejuvenate the program through 2022. The DNR will be making aggregate maps for Kandiyohi, Redwood, Swift, and Sibley counties. Funding for this project is provided by the Minnesota Environment and Natural Resources Trust Fund as recommended by LCCMR.

ClayItascaAitkinMille LacsKanabecChisagoIsantiSherburneBentonStearnsMeekerWrightRenvilleNicolletBlue EarthLe SueurDodgeOlmsteadMetroSt. Louis and LakeCarlton