2020 Map of Rochester

About this map

The Chehalis River and its major tributaries define the lowland geography of this section of Thurston and Lewis counties. The terrain is characterized by broad glacial outwash plains, including Mima Prairie, Baker Prairie, and Grand Mound Prairie, which support a network of small agricultural and residential centers. Rochester and Grand Mound serve as the primary hubs, while smaller locales like Mima, Essex, and the rail-oriented Helsing Junction highlight the area's historical transportation and settlement patterns. To the south, the landscape rises into the timbered slopes of Michigan Hill above the Lincoln Creek Valley. In the north, the Black River meanders toward its confluence, while the Grand Mound Cem and R & K Skyranch Airport provide specific points of interest for genealogists and local historians tracking family sites and rural aviation infrastructure.