The Dairy-McKay watershed drains 231 square miles (147,956 acres) in the norhtern part of the Tualatin River basin (Map 1-1). It is the largest watershed contributing to the Tualatin River, constituting nearly one-third of the entire basin. From its headwaters in the Tualatin Mountains, the mainstem tributaries flow in a generally southerly direction, ultimatley joining the Tualatin River at River Mile 45, near the city of Hillsboro, Oregon.
Click on titles to navigate to specific documents. For ease of function, the Dairy-McKay Watershed Analysis and the maps are separate Adobe Acrobat PDf files.
All the Dairy Mckay Watershed documents are scanned images and are not readable with Accessibility Software. For additional assistance contact the BLM Salem District at 503.375.5646.