Clark County, WashingtonPublic Alert Grids are 1/4-mile rectangles (grids) used when targeting public alert messages to specific areas in Clark County and southern Cowlitz County. When needed, grids are selected to represent the full area that requires the message. Using the grid codes, field commanders can easily communicate the extent of the needed alert area to CRESA and mapping (GIS) staff. For example, a wildfire that requires an evacuation zone can be delineated in the field and the grid codes (making up the evacuation zone) can be used to communicate the extent to CRESA. The grids are loosely based on Public Land Survey System (PLSS) quarter sections. However, they should not be used as a survey or legal description reference. See Clark County Metadata Data source: ..\FGDB\dw_PubSafety.gdb\PublicAlertGridsArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d0b450bbcfe34d479065fb62e9a5b3e6_0engClark County Open DataPublicPublic Alert Grids [Washington (State)--Clark County]Web servicesWashington (State)--Clark CountyWashington (State)Last Modified: 2026-01-07