MSL – USDA NRCS Data Development and Sharing Partnership
Natural Resource Inventory

Major Land Resource Areas (MLRA)

The USDA MLRA’s represent landscape level geographic areas with distinct physiography, geology, climate, water, soils, biological resources and land use. These delineations are incorporated into the distinctions between ecological sites.


SSURGO data depicts information about the kinds and distribution of soils on the landscape. These data sets are digital soil surveys and are the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The map data include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped.

Interpretive Soils Maps

  • The statewide Drainage Class map represents the drainage class assigned to SSURGO soil map units
  • The statewide Farmland Class map represents the farmland class assigned to SSURGO soil map units
  • The statewide Relative Slope map represents average slopes associated with SSURGO soils map units
  • The statewide Hydric Class map displays the percentages of hydric components associated with SSURGO soils map units

Wetland and Riparian Mapping Data

The Wetlands Framework from the Montana Natural Heritage Program is a detailed digital map of wetlands and riparian areas in Montana. Read more.