[3] He committed to play college football at Texas Tech after receiving offers from schools such as Arizona, Baylor, Colorado, and Boise State.

[10][11] He finished his career fifth on Texas Tech's all-time rushing list behind Byron Hanspard, James Gray, Ricky Williams, and Bam Morris.

Representatives and scouts from all 32 NFL teams showed up at the Pro Day to watch Washington, Jakeem Grant, Le'Raven Clark, and Branden Jackson.

[19] He entered training camp competing for the backup running back position with George Atkinson III, Jalen Richard, Roy Helu, and Taiwan Jones.

Washington was named the Raider's third running back on their depth chart behind Latavius Murray and Taiwan Jones.

[22] On October 16, 2016, he earned his first career start during a 26–10 loss to the Kansas City Chiefs and finished the game with a season-high ten carries for 49 rushing yards.

[26] In the offseason leading into the 2017 season, the Oakland Raiders added veteran running back Marshawn Lynch to the backfield.