The Cochan was the last stern-wheel steamboat operated by the Colorado Steam Navigation Company (CSNC) on the Colorado River, running from late 1899/1900 until about 1909–1910. Named for the Quechan (Yuma) people, it marked the end of commercial steam navigation on the lower Colorado after nearly six decades of steamboat activity that began in 1852.
Origins and Construction
By 1899, CSNC owners Isaac Polhamus and Jack Mellon faced aging vessels and renewed competition from newer boats (including the St. Vallier). Their remaining steamers, the Mohave II (about 23 years old) and the Gila (launched 1873 and already more than 25 years in service), had worn hulls requiring heavy maintenance. The Gila was selected because it retained better engines.
In late 1899, the Gila’s machinery was refurbished and installed in a rebuilt (or heavily reconstructed) hull at the shipyard in Yuma, Arizona, at a cost of roughly $25,000 (some accounts cite about $27,000). The vessel was launched on November 8, 1899, and renamed Cochan. It was two tons lighter and 14 feet shorter than the Gila.
Key specifications:
- Displacement: 234 tons
- Length: 135 feet
- Beam: 31 feet
- Draft: 11 inches unloaded; less than 2 feet (about 22 inches) when loaded with cargo
- Cargo capacity: up to 125 tons of freight
- Propulsion: stern paddlewheel driven by the refurbished steam engines from the Gila
The Cochan was a classic Western-river sternwheeler optimized for the Colorado’s difficult conditions—shifting sandbars, snags, swift currents, seasonal low water, and abrasive sand. Design priorities emphasized extreme shallow draft, a relatively flat or lightly built wooden hull reinforced against grounding and impacts, and reliable (rather than high-speed) power for towing barges. Sternwheel configuration aided maneuverability in confined or shallow channels and allowed techniques such as using the wheel to help dig through bars. These principles continued the adaptations that Colorado River boats had developed since the 1850s, prioritizing flotation and cargo-carrying ability in minimal water over ocean-style seaworthiness or deep-draft efficiency.
In 1900 the company also built a new barge, the Silas J. Lewis (about 150 feet long and 32 feet in beam), for the Cochan to tow, while scrapping older barges.
Operations and Role in Trade
The Cochan entered service in January 1900, carrying freight to mining districts such as the Quartette and Searchlight mines in Nevada and competing directly with the St. Vallier (and later the Searchlight). It operated primarily on the lower Colorado between Yuma, Arizona, and points upstream toward Needles, California, and mining areas, supporting the final phase of the region’s mining boom with supplies, equipment, ore, and passengers.
Steamboats like the Cochan remained important for expanding and sustaining trade along the Colorado long after the Southern Pacific Railroad reached Yuma in 1877. They provided the most economical means of moving bulk goods across the desert Southwest until rail lines fully displaced them. The Cochan and its contemporaries hauled freight for mines, helped supply irrigation and reclamation projects (including work related to the Imperial Valley and the temporary diversion that formed the Salton Sea), and maintained local commerce on stretches of the river still poorly served by rail. By the early 1900s, however, additional rail bridges (including the Arizona and California Railroad at Parker in 1905) and the completion of Laguna Dam in 1909 (about 14 miles above Yuma) progressively eliminated upstream navigation. By the end of 1905 most boats, including the Cochan, had been withdrawn to the Yuma area.
End of Service
Just before Laguna Dam closed the river to steam navigation, the CSNC sold its remaining boats, including the Cochan, to the U.S. Reclamation Service in 1909. The Service had no need for the vessel, and it was dismantled in the spring of 1910 at Yuma. This marked the practical end of the steamboat era on the lower Colorado, which had facilitated thousands of tons of annual commerce since the 1850s.
Historical Significance
The Cochan embodied the final refinement of shallow-draft sternwheeler design for one of North America’s most challenging rivers. By recycling proven engines into a lighter, shorter hull with exceptional draft performance, its builders extended the economic life of river transport during a period of intensifying competition from railroads and dams. It supported late mining activity, early 20th-century reclamation efforts, and residual trade until infrastructure changes rendered steamboats obsolete. As the last major sternwheeler of the Colorado Steam Navigation Company, the Cochan closes a chapter in the transportation history of the American Southwest that had opened the desert interior to sustained commercial development.