The Cibola-Trigo Herd Management Area (HMA)
Reaching across the border of Arizona and California, the Cibola-Trigo HMA extends from Imperial Dam, west of the Colorado River, to Walters Camp in California. This area is large, with the HMA comprised of nearly one million acres in the lower Sonoran Desert.
How to get there:
Located primarily between U.S. Highway 95 and the Colorado River, and Interstates 8 and 10, the HMA is about 20 miles north of Yuma, Arizona.
About the Burros:
Today, the burro population here numbers approximately 527. The burros found here are typically grey in color and are fairly fine boned. They average about 350 to 400 pounds and 40 inches in height.
During the summer months, the burros congregate along the Colorado River or other water sources. In late fall and early winter, depending upon rainfall, the burros disperse across the HMA. They begin their move back to the river in May or early June, and temperatures rise and the mesquite beans ripen. The wild horses remain near a permanent water source year round. Presently there are about 319 wild horses within the HMA.