| Stretch: | Marble Mill Site Park to Bogan Flats Campground |
| Difficulty: | Class III to IV |
| Distance: | 4.8 miles |
| Flows: | 500 to ~3,000 cfs. USGS Crystal River above Avalanche Creek gauge |
| Gradient: | 75 fpm average (100 fpm in the rapid sections) |
| Put-in: | Marble Mill Site Park in Marble Co |
| Take-out: | Shoulder and the entrance of Bogan Flats Campground |
| Shuttle: | 4.7 miles, (15 minutes one-way) |
| Season: | Spring off snowmelt |
| Written: | © 2021 |