The Lower Deschutes River will remain open for steelhead fishing.  The Oregon Department of Fish and Wildlife says more than 21,000 unmarked summer steelhead have passed Bonneville Dam since July 1, the highest run to date in nearly 10 years, though still well below the 20-year average as the upriver summer steelhead run has been at historically low levels for much of the last decade.  ODFW says the John Day, Umatilla, Grand Ronde and Imnaha Rivers are also on track to be open.  The fisheries use Passive Integrated Transponder tag returns over Bonneville and Ice Harbor dams to determine if runs are healthy enough to allow for fishing.  Summer steelhead don’t return to these rivers until later in the year.  A few regulation updates are in effect.  The lower John Day bag limit is one hatchery steelhead until Aug. 29.  Thermal angling sanctuaries are in place, meaning angling is closed through Sept. 15 in the Deschutes River mouth and other areas on the mainstem Columbia River.  New for this year, the Walla Walla River is closed to steelhead fishing under permanent regulations.