A 19-point fourth quarter carried the host Chieftains to the non-league victory.
Gabrielle Collins had 10 fourth-quarter points, hitting all eight of her free throws in the final period.
Columbia River coach Carl Click said the Chieftains played smart basketball in the fourth quarter. River (3-3) finished with a double-digit advantage in rebounds (37-25), and had nine fewer turnovers than Mountain View.
Maddie Kessi and Emma Fisk each grabbed 12 rebounds to lead River on the boards.
Collins finished with a game-high 15 points. Hailey Hartney led Mountain View (4-2) with 14 points, including all seven Thunder points in the fourth quarter.
COLUMBIA RIVER 43, MOUNTAIN VIEW 32
MOUNTAIN VIEW (4-2) — Christina Lundy 0, Eva Winsheimer 0, Jenna Gulliford 2, Emilly Moore 8, Gabby Harper 3, Samantha Smith 0, Mollie Doyle 1, Hailey Hartney 14, Ashley Doyle 4. Totals 12 (5) 3-7 32.
