Balch Creek begins in the Forest Park neighborhood in unincorporated Multnomah County near the intersection of Northwest Skyline Boulevard and Northwest Thompson Road at the crest of the West Hills. It flows generally east about 3.5 miles (5.6 km) to its confluence with the Willamette River, a major tributary of the Columbia River.[4] The creek drops from 1,116 feet (340 m) above sea level at its source to 46 feet (14 m) at its mouth, a total of 1,070 feet (330 m).[1][2] Most of this occurs in the first 2.5 miles (4.0 km). In the hills, the stream gradient (slope) generally ranges from 15 to 30 percent interspersed with sections of less than 15 percent along the middle reaches.[12]


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