Catherine Creek is a 32.4-mile-long (52.1 km)[1] creek in northern Oregon, United States.[2] It is a tributary of the Grande Ronde River. It is the second largest waterway in the Grande Ronde Valley after the Grande Ronde River. It has also been known as Ladd Creek.[2]
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Catherine Creek begins as two forks, North Fork Catherine Creek and South Fork Catherine Creek. These forks both begin in Wallowa-Whitman National Forest, in the Wallowa Mountains. These forks join and flow toward the Grande Ronde Valley. On the way, Catherine Creek passes through Catherine Creek State Park. In the Grande Ronde Valley, Catherine Creek passes through the city of Union, and finally empties into the Grande Ronde River at .