The San Joaquin River – the second longest river in California – was once home to one of the largest populations of spring-run Chinook salmon, a species of fish that is now classified as threatened under the Endangered Species Act. Thanks to a collaborative multi-agency effort that includes the Department of Water Resources (DWR), spring-run Chinook salmon are successfully returning to the San Joaquin River for the first time in more than 65 years. At the end of May 2019, 23 adult spring-run Chinook returned, surviving their nearly 370-mile round trip journey to the Pacific Ocean as juvenile fish and the trip back to the San Joaquin River as adults to spawn – typically a two to five-year process.