Washington made his decision while on an official visit last weekend.
"I liked everything about UAB," Washington told the paper. "The coaches, the school, the players, the community, it's a family-oriented place. I like how the coach was with the players and I like the style of play."
Auburn, Colorado State, Rhode Island and Virginia Tech were also involved. Washington joins PG Dayshawn Watkins (Little Rock, Ark./North Little Rock) and PG Denzel Watts (Flint, Mich./Carman-Ainsworth) in the Blazers' 2013 class.