Location of the GWMA

The GWMA includes the combined areas of Adams, Franklin and Grant Counties in eastern Washington.  The GWMA boundaries incorporate 5,985 square miles or 3,830,400 acres.  The area includes all or portions of Water Resource Inventory Areas (WRIAs) numbered 33, 34, 36, 41, 42, and 43 falling within the geographical boundaries of these three counties.  Click here to view the geographical boundaries.