Great American Horse Drive, Sombero Ranch, Craig, Colorado. Michael Huggan, photographer. Did you know that you can participate yourself in the Sombrero horse drive? It is an annual event, and has been a tradition for over 40 years as they move their herd each spring. You can join other riders in this unique experience in driving one of the largest horse herds in the state over 60 miles of open Colorado range. Click the photo for more information on this great event!