Although seasonal precipitation was near average, runoff volumes for 2005 were below average for the January to July period for all sites measured throughout the Columbia River Basin. The average runoff volume among the six measured sites was approximately 67% of the average run off volume between 1971 and 2000. The April 10th Biological Opinion elevations were not met for any of the measured sites. Furthermore, hydrosystem operations and runoff conditions resulted in flows that did not meet the spring or summer seasonal Biological Opinion flow objectives at Lower Granite Dam, McNary Dam, and Priest Rapids Dam for 2005. Spring spill was provided as described by the 2004 Biological Opinion program for fish passage at Ice Harbor, McNary, John Day, and Bonneville Dams, within the constraints of the State waivers for total dissolved gas supersaturation levels. Conditions with the spillway gates at the Dalles Dam were deemed unsafe. Thus, this project was operated with fixed gate settings to get close to a 40% spill, although actual spill was often less than this 40% target. To enhance fish passage, the action agencies operated John Day Dam to spill 40% during the day and 60% at night from May 20-May 30. The salmon managers requested that this operation be continued as long as The Dalles Dam was not fully operative but action agencies denied this request. Planned spring spill under the 2004 Biological Opinion measures did not occur at Lower Granite, Little Goose, and Lower Monumental due to low average spring flow. On June 10, 2005, the 9th Circuit Court issued an order that mandated spill during the summer months at the Snake River and McNary transportation dams. Lower Granite, Little Goose, and Lower Monumental began their mandated summer spill on June 20, while McNary Dam began its spill on July 1. Ice Harbor, John Day, The Dalles and Bonneville dams spilled as called for in the 2004 Biological Opinion. Gas bubble trauma (GBT) sampling was successful for the 2005 season. As in past years, the number of fish showing fin signs appeared to be proportional to the levels of TDGS experienced by fish. The 2005 sample year was unique due to a mandated summer relief spill program for the Snake River and McNary transportation dams. This summer spill program resulted in detectable GBT signs from only one dam, Little Goose, where 0.9% of fish had signs of GBT, which were all of the lowest level.