April - November. Since the dams were built, flows are usually highest in March and April, with the levels gradually dropping into late summer. However, releases fluctuate in order to assist salmon runs. Releases from Hells Canyon Dam often fluctuate widely, so camp well above river level and tie your boat securely. High water begins around 30,000.
Skilled boaters can run at higher levels, but the danger increases.
Flows at the put-in vary from 5,000 to over 50,000 and average roughly 8,000 to 35,000. Be warned that strong eddies occur at all flow levels. The river below Pittsburg Landing is good canoeing water, and no advance permit reservations are required. Permits are required from Hells Canyon Dam to Rush Creek from the Friday before Memorial Day through September 10. After the lottery, you can call for unassigned dates.