Summer Operational Schedule

May 1 - 31, 2011: Flows at or above 1500 cfs at the put-in below Boyle Powerhouse (Spring Island Put-in) by 8:00 AM 7 days a week. The 1500 cfs will be sustained as long as inflows allow and operations require. Duration at 1500 cfs may be shorter than in past years due to the lower flow requirements at Iron Gate dam for the month of May. PacifiCorp recommends all river users check the water release schedule daily, to verify flows and release times.

June 1 – September 5; Non-holiday periods (Monday, Tuesday, Thursday, Friday, Saturday, and Sunday): The J.C. Boyle Generator unit start time will be 8:00 a.m. for these days. Flows of 1200 cfs or greater are typically achieved at the powerhouse, approximately three hours after the indicated generation unit start time. An additional 150-300 cfs of base flow occurs in the JC Boyle bypass reach, between the dam and the put-in. It is recommended that all boating parties check the BLM staff gauge at the put-in to verify actual flow. Recreational users should recognize that the cfs values listed in the Hourly Estimated Flows Table are an average for the hour listed (i.e., the value for 11:00 is an average of the flows occurring between 10:00 and 11:00). Therefore, when ramping is in progress, actual turbine flow on the hour indicated may be approximately 150-300 cfs higher than the value shown.

June 1 – September 5; Non-holiday periods (Wednesday): Open day as needed. This is PacifiCorp's day to correct reservoir position, if needed, so that recreation and power commitments can be preserved for the balance of the week. PacifiCorp reserves the right to operate the project later in the day or as necessary. PacifiCorp recommends all river users check the water release schedule to verify flows for these days.

4th of July Holiday (July 2-4): Raftable flows (1500 cfs at put-in) by 10:00 a.m. forecasted for all days. PacifiCorp recommends all river users check the water release schedule daily, to verify flows and release times.

Labor Day Weekend, Sept 3-5: (Saturday - Monday): Raftable flows (1500 cfs at the put-in) by 10:00 a.m. forecasted for all three days. PacifiCorp recommends all river users check the water release schedule daily, to verify flows and release times.

Summer 2011 J.C. Boyle Maintenance Outage Schedule: There are currently no planned extended outages at the J.C. Boyle project. Nevertheless, there is always the possibility of a mechanical failure causing unplanned outages. Any unplanned outages at J.C. Boyle could impact the rafting schedule. Check the water release schedule daily, to see if unplanned outages have any effect on rafting.

The intent in providing the above information is to provide raftable flows, as listed. However, if difficulties arise in the power supply situation, PacifiCorp reserves the right to operate the project later in the day or as necessary. PacifiCorp recommends all river users check the water release schedule daily, to verify flows and release times.

If you have questions or comments about the information provided herein, contact Russ Howison, Recreation Planner, (503) 913-3634.

For more information on this and other rivers, call our Public Service recording.