GIS Webmap

The Chehalis Basin webmap has been developed in support of the Chehalis Basin Strategy using Geographic Information System (GIS) data acquired from both publicly available and project specific sources.  The map is intended to provide a visual means of reviewing available data as well as to provide access to it via download. Data presented in the map represent a large collection of the overall data used for mapping and analysis in the development of both the Programmatic Environmental Impact Statement (PEIS) and the ongoing Aquatic Species Restoration Plan (ASRP).  Data are current as of their date of acquisition, which varies by dataset. It is anticipated that additional data will be added to the map as it becomes available. For questions or requests please contact Bob Montgomery at