From its source at the confluence of Mann and Wolf creeks in the Cascade Range, it flows generally southwest to join the McKenzie near the community of Blue River.

Descending from an elevation of about 2,500 feet (760 m) above sea level, the river flows generally southwest through the Willamette National Forest.

Blue River and the reservoir curve to the southwest, and Scott Creek enters from the right at RM 5 (RK 8).

At this point, Forest Road 15 leaves the river and the reservoir and heads south to Oregon Route 126.

The river passes a United States Geological Survey stream gauge below the dam, and then Simmonds Creek enters from the right.