The school is way too small to accommodate the number of students they have, and the town is way too small to accommodate a bigger school. Rexburg is going to be having a major growth spurt soon (actually, it's already started, but it's gonna get a lot worse).
The town is growing like crazy. I don't recognize it and I've only been away for a few years.
They've been able to make up for the size of the school by forcing kids to go in the summer. I don't know how much bigger they want the school to get though.