The Portneuf River Channel in Pocatello, Idaho through approximately 100 years of change (from 1934 to 2013) is a series of polygons of the river channel and associated cut-off channels and meanders. Each data set from 1934 to 2013 are digitized from source maps and includes cut-off channels and meanders demonstrating how railroad, transportation, and flood control have shaped a river. This is a series of polygon datasets, showing the main channel of the Portneuf River along all reaches of the Portneuf Vision Study area from Siphon Road in the northwest reach past the Portneuf Gap and Fort Hall Mine road southeast of the South Pocatello Reach. This demonstrates how engineering of a riparian ecosystem has changed and shortened the river channel there by reducing riparian habitats through time. The 1934-1937 layer is particularly important because it shows the least interference from riverine engineering, including fewer levees and no concrete channelization.