Port Isabel, Sonora
Port Isabel was a seaport established in 1865 during the American Civil War in Sonora, Mexico near the mouth of the Colorado River on the Gulf of California to support the increased river traffic caused by the gold rush that began in 1862 on the Colorado River and the Yuma Quartermaster Depot newly established in 1864 to support the Army posts in the Arizona Military District. Port Isabel replaced Robinson's Landing as the place where cargo was unloaded in the river from seagoing craft on to flatbottomed steamboats of the Colorado River and carried up to Fort Yuma and points further north on the river.
Port Isabel, was situated on the east bank of the Colorado River on its channel east of Montague Island about 21⁄2 miles from its mouth, at the first good landing place, the shores below being of very soft mud. Port Isabel, served as a location for repairing the river steamers and barges. Additionally about 2 miles above Port Isabel was a site called Ship Yard, which had a few frame buildings where steamboats could be constructed or repaired.
The arrival of the Southern Pacific Railroad in Yuma in 1877 signaled the end of Port Isabel. Trade by sea was replaced with cargo carried by rail. In 1878, George Alonzo Johnson sold his Colorado Steam Navigation Company to the Southern Pacific Railroad. Yuma then became the head of navigation for steamboats operating on the river. Port Isabel was abandoned in 1879.
- Joseph C. Ives, Report upon the Colorado river of West, Washington, Government Printing Office, 1861. p.27
- The west coasts of Mexico and Central America from the United States to Panama including the gulfs of California and Panama: Chiefly from surveys by the United States steamers Narragansett, Tuscarora, Ranger, and Thetis, between 1873 and 1901; United States Hydrographic Office; Government Printing Office, 1904. pp.155-157
- Official Map Of The Territory Of Arizona, With All The Recent Explorations. Compiled by Richard Gird C.E. Commissioner. Approved By John N. Goodwin, Governor. In Accordance With An Act Of The Legislature, Approved Oct. 23d. 1864. We hereby certify that this is the Official Map of the Territory of Arizona, and approve the same. Prescott October 12th 1865. (with signed seal dated 1863). Published By A. Gensoul, Pacific Map Depot. No. 511 Montgomery St. San Francisco. Lith. Britton & Co. San Francisco.. Accessed from www.davidrumsey.com, December 1, 1865. Shows location of Port Isabel, Sonora an other landings along the Colorado River, 1865.