Since Lake Columbia was impounded behind the Okanogan lobe, which rose to, this lobe effectively blocked the normal course of the Columbia River, blocking the Missoula Floods and diverting water to flow across much of eastern Washington state.
This lobe effectively blocked the normal course of the Columbia River. This lobe effectively was blocking the Missoula Floods. This lobe effectively was diverting water. This was to flow across much of eastern Washington state. Lake Columbia was impounded behind the Okanogan lobe. The Okanogan lobe rose to.