Due to better than expected sockeye fishing, sockeye and hatchery steelhead angling and retention in the mainstem Columbia River will close effective 12:01 a.m. Thursday morning.   The closure includes the mainstem Columbia River downstream of the Oregon-Washington border, about 17 miles upstream of McNary Dam.  The combined sockeye return to the Columbia River includes fish destined for the Snake River, which are listed as endangered under the Federal Endangered Species Act.  Through June 21, anglers downstream of Bonneville Dam have kept an estimated 2,721 sockeye, exceeding the 1 percent ESA take limit allowed for combined non-treaty fisheries based on the preseason forecast of 246,300 fish.  In-season projections for sockeye and summer Chinook abundance should be available early next week, which will help determine fishery options moving forward into July.