Science Geologists trace Colorado River’s origin to Bidahochi Basin overflow 5.6 million years ago by Anika Shah - Technology April 18, 2026 by Anika Shah - Technology April 18, 2026 The Colorado River began carving the Grand Canyon 5.6 million years ago after overflowing an ancient lake that had formed in the Bidahochi Basin, resolving a long-standing geological mystery about … 0 FacebookTwitterPinterestEmail