The President is authorized to declare the establishment of a river basin water and related land resources commission upon request therefor by the Council, or request addressed to the Council by a State within which all or part of the basin or basins concerned are located if the request by the Council or by a State (1) defines the area, river basin, or group of related river basins for which a commission is requested, (2) is made in writing by the Governor or in such manner as State law may provide, or by the Council, and (3) is concurred in by the Council and by not less than one-half of the States within which portions of the basin or basins concerned are located and, in the event the Upper Colorado River Basin is involved, by at least three of the four States of Colorado, New Mexico, Utah, and Wyoming or, in the event the Columbia River Basin is involved, by at least three of the four States of Idaho, Montana, Oregon, and Washington. Such concurrences shall be in writing.