Johnson Creek January 1934

Johnson Creek Watershed Map

^{Johnson Creek originates in Boring, Oregon, and travels 26 miles west through Clackamas and Multnomah counties, Gresham, and Portland before reaching its confluence with the Willamette River in Milwaukie. About 170,000 people live within the 52 square miles that make up the watershed. The landscape varies from heavily developed urban areas in the lower and middle reaches (Milwaukie, Portland and Gresham) to rural and agricultural areas in the upper watershed.}

^{The area of the watershed north of the Johnson Creek main-stem is typically flat, with large floodplain areas, particularly in Lents. These floodplains are thought to be a remnant of large glacial floods that occurred about 15,000 years ago. Johnson Creek floods on average every other year. It is one of the last free-flowing streams in the Portland area and provides important habitat for coho and Chinook salmon, steelhead and cutthroat trout.}