Following an in-season assessment of the upriver spring Chinook return, fishery managers from Oregon and Washington added more recreational spring Chinook fishing days on the mainstem Columbia during a joint state hearing.  Fishery biologists expect the upriver-origin adult spring Chinook return to meet the preseason forecast of 122,500 fish.  As of Monday, a total of 58,277 adult spring Chinook have passed Bonneville Dam, which is greater than the recent 10- and 5-year average cumulative count for this date.  Downstream of Bonneville Dam will be open to spring Chinook fishing from Friday through May 22.  Only the Oregon and Washington banks from Beacon Rock upstream to the Bonneville Dam deadline will be open.  Upstream of Bonneville Dam will be open on Saturday and Tuesday only from the Tower Island power lines, approximately six miles below the Dalles Dam, upstream to the Oregon/Washington border, plus only the Oregon and Washington banks from Bonneville Dam upstream to the Tower Island power lines.  Daily bag limit is two adult hatchery Chinook of steelhead per day, but only one may be a Chinook.  Shad may also be retained.