Later, in 1830, Mexican farmers settled in the area, establishing more permanent farming operations and transporting their produce through the Redington Pass to Tucson with the protection of soldiers from the Presidio.

Ohnesorgen ran a stage stop on what had been the Butterfield Overland Mail route as well as constructed a wooden toll bridge over the San Pedro River.

With the coming of the Southern Pacific Railroad in 1880 and the establishment of the town of Benson just a couple miles south, and the private construction of a new stage road by J.D.

Kinnear that bypassed the Tres Alamos location, the stage stop became superfluous and was abandoned.

[2] The Tres Alamos post office was established in 1874 to serve ranchers along the San Pedro River.