The North Fork Clackamas River is a tributary, about 11 mi long, of the Clackamas River in the U.S. state of Oregon. Originating at nearly 4000 ft above sea level on the west side of the Cascade Range, it flows westward through Mount Hood National Forest. It joins the Clackamas at North Fork Reservoir, about 32 mi from the larger river's confluence with the Willamette River. From source to mouth, the following tributaries enter the river: Dry Creek from the right bank, Boyer Creek from the left bank, then Whiskey, Bedford, Bee, and Fall creeks, all from the right. Elevations in the watershed range from 4770 ft in the headwaters on Tumala Mountain to 660 ft at the river mouth. Prominent landforms include Ladee Flats, a flat-topped ridge composed of lava flows resistant to erosion. The North Fork valley is narrow and steep, and a 50 ft waterfall 2.5 mi from the mouth limits passage of migratory fish. Native rainbow and cutthroat trout are found in the upper river and its tributaries, while the lower river has winter and summer steelhead, coho salmon, spring chinook, and stocked rainbow trout.