Company Summary. Durango Gravel manufactures numerous types of gravel products from base rock. These products are 3/4″ and 3″ ABC, 3/8″, 1/2″, 3/4″ 111/2″ screened and washed rock, 1″3″ cobble, and 4″6″ cobble. In addition, we provide, prewashed sand, fill dirt, topsoil, bedding materials and crusher fines, along with ...