The U.S. Army Corps of Engineers says Columbia River levels between John Day and McNary dams could be higher during the next three months.  From October through December, Lake Umatilla, the section of the Columbia River above John Day Dam, will be operated in a broader and higher range.  That means river users could see river levels 2.5 feet higher than in the spring and summer.  The operation is to meet requirements spelled out in a biological opinion to support juvenile fish migration, maintain minimum water levels for irrigation withdrawals, and to accommodate tribal treaty fishing operations.  In addition to the higher levels, users may also see more variability than in recent months.