On the tops of hills around Houghton is where the water towers are located, because we store the water where it will run downhill to all the users. On the tops of hills is also one of the best places to find glacial grooves, because the sediments washed away from hilltops and the glaciers were in contact with bare rock outcrops there. In this place the water tower is near a triangular survey marker.  Under that marker is where glacial grooves are cut into basalt.

Glacial grooves can be used to determine the direction of ice movement.