Nikki Corbett scored 19 of her 24 points in the second half to lead the visiting Papermakers to the Class 4A Greater St. Helens League win.
Camas outscored Union 19-7 in the fourth quarter to pull away.
The Titans struggled shooting from the perimeter, finishing with one made 3-pointer.
After a low-scoring first half ended with Camas in front 16-9, Union outscored the visitors 21-17 in the third quarter to pull within five points.
Tee Anderson scored 11 of her 15 points in the second half for Union, and Tessa Vanderpool tallied eight of her 10.
CAMAS 52, UNION 35
CAMAS — Meghan Finley 6, Brenna Khaw 12, Rachel Rice 6, Brenna Vargo 2, Noora Monghate 0, Rachel Gray 0, Nikki Corbett 24, Mia Hunt 2, Emma Jones 0, Madison Hutton 0. Totals 15 (2) 20-32 52.