Ashley Brannan scored 11 of her game-high 19 points in the third quarter, when the Bulldogs took control in a Trico League road win.
Stevenson (9-4, 2-1) outscored the Rockets 25-8 in the third quarter after leading 27-26 at halftime. Jazmine Morat scored eight of her 10 points the third.
Brannan, who hit four 3-pointers, also had seven rebounds. Katie Rathgeber had 10 points and 10 rebounds.
Brooke Wirkkala and Rachel Anderson each scored 12 points for Castle Rock (5-7, 0-3).
STEVENSON 63, CASTLE ROCK 52
STEVENSON — Jaida Emerson 8, Cassie MacNab 12, Jade Waymire 0, Katie Rathgeber 10, Isabella Spencer 0, Jazmine Morat 10, Ashley Brannan 19, Sydney Cole 1, Alisyn Backlund 0, Kaitlyn Wenz 3. Totals 22 (6) 13-24 63.