 Neighboring watersheds on the east side of the Willamette River include Mount Scott Creek and Kellogg Creek, which flow through Milwaukie and drain directly into the Willamette; the Clackamas River, which drains the southeast suburbs and empties into the Willamette near Oregon City; the Sandy River, which drains the eastern suburbs and empties into the Columbia; and Fairview Creek and the Columbia Slough, which drain north Portland and Gresham, emptying into the Columbia.19th-century maps also show numerous springs and small streams flowing into a wetland that covered an area of today's southeast Portland between Powell Boulevard (U.S. Route 26) and Johnson Creek, a distance of .Though most of the wetland complex has been filled in and built upon, remnants exist at the Crystal Springs Rhododendron Garden on Crystal Springs Creek.