A network of ancient irrigation channels criss-cross the fields of Castejón del Puente and carry water to the farthest corners of the municipality.  Local people have maintained these man-made channels well over the centuries to ensure water for their crops.

Although the wheel itself is no longer visible, the formidable stone structure that held it in place gives an idea of the size of the waterwheel that once stood here.  Known as Huerta Vieja, it used pail-like paddles to scoop up water while the cequiero, or operator, kept watch to ensure the mechanism functioned well. Behind the water wheel are the remains of the house where the operator lived.

The remains of the Castejón wheel, together with the remnants of a similar wheel in Almudevar, are the only remaining evidence of waterwheels in the Alto Aragon region.