As part of the massive Star Wars Land expansion of Disneyland during 2016-2019, the Rivers of America had to be re-routed. This shortened the length of the river itself, and also forced a very thorough re-Imagineering of the entire northwest corner of the park. This thread can track those changes as they come online and reopen during the summer of 2017, and then likely culminate in the reopening of the Disneyland Railroad that also has a very different route and dramatically different scenery along the way. Here's the official WDI artwork from 2016 of these changes. And roughly how they fit in and form the new berm separating Star Wars Land to its north and east.