US lawWashingtonRegulationsTitle 173 — ECOLOGY, DEPARTMENT OFChapter 173-546 — WATER RESOURCES MANAGEMENT PROGRAM—ENTIAT RIVER BASIN WATER RESOURCE INVENTORY AREA (WRIA) 46173-546-150WAC 173-546-150WAC 173-546-150. MapLast amended: 2005Year: 2026Length: 27 wordsOfficial source For the purposes of administering this chapter, the boundaries of the Entiat River basin identified in the figure below are presumed to accurately reflect the basin hydrology.PreviousWAC 173-546-140