The Major Land Resource Area Soil Survey (MLRA) Management Office, Region 4, located in Bozeman, Montana, is one of 18 regional MLRA offices serving the National Cooperative Soil Survey in the United States and its trust territories. MLRA Office (MO) 4 provides regional coordination, quality assurance, technical guidance and support, and technology transfer to state and project soil survey offices in parts of Idaho, Montana, Oregon, Washington, and Wyoming.
MLRAs are geographically associated land resource units, usually encompassing several thousand acres. A unit may be one continuous area or several separate nearby areas. MLRAs are characterized by particular patterns of soils, geology, climate, water resources, and land use.