English: Map of Tryon Creek watershed in Multnomah and Clackamas counties, Oregon, United States. The creek begins in Portland, Oregon, and flows into the Willamette River between the city of Lake Oswego and the unincorporated community of Briarwood.
Date
Source
Taken from U.S. Census website here and modified by User:Finetooth. Watershed boundaries from the Portland Bureau of Environmental Services here and the Tryon Creek Watershed Council here.
U.S. government work in public domain; my modifications licensed under GFDL, CC-BY-SA-3.0
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{{Information |Description={{en|1=Map of Tryon Creek watershed in Multnomah and Clackamas counties, Oregon, United States. The creek begins in Portland, Oregon, and flows into the Willamette River between the city of Lake Oswego and the unincorporated com