The Loggers won 65-20, with 10 different players scoring.
Claire Maples led the way, finishing with a game-high 15 points, while teammate Kira Morris chipped in 11.
The Eureka girls led 23-5 after the first quarter and had stretched the advantage to 30 before halftime, with several bench players seeing substantial minutes
Kaylei Valk had a big game for the Cubs, finishing with a team-high 14 points.
Melody Bareilles added nine points for Eureka, while Amaya Gee and Aniah Gaither each had six and Bella Vigil and Maddie Woods both scored five.
South Fork, which dropped to 0-2, will host Ferndale on Friday.