Tag: Arizona

Arizona, located in the southwestern region of the United States, is renowned for its diverse landscapes and cultural richness. Home to iconic natural wonders such as the Grand Canyon, Monument Valley, and the red rocks of Sedona, Arizona offers a dramatic and varied terrain that ranges from arid deserts to pine-covered mountains. The state’s climate is typically characterized by hot summers and mild winters, with the southern parts being desert-like while the northern regions experience a more temperate climate. Arizona is also rich in Native American history, with numerous tribes such as the Navajo, Hopi, and Apache having deep roots in the region. The state’s cities, including Phoenix and Tucson, blend modern urban life with a strong appreciation for the natural environment and cultural heritage. Arizona’s economy thrives on tourism, technology, and agriculture, making it a dynamic and multifaceted state.

Glen Canyon Dam

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Glen Canyon Dam is a concrete arch-gravity dam on the Colorado River in northern Arizona, near the town of Page (about 15 miles upstream from Lees Ferry and roughly 8 miles south of the Utah-Arizona border). It stands 710 feet high above bedrock (583 feet above the original riverbed), with a crest length of 1,560 feet. It forms Lake Powell, one of the largest reservoirs in the United States (capacity roughly 24–27 million acre-feet at full pool of about 3,700 feet elevation). The dam is a key unit of the Colorado River Storage Project (CRSP).

Glen Canyon Dam, Page, Arizona. Photo by James L Rathbun
Glen Canyon Dam, Page, Arizona. Photo by James L Rathbun

Origins and Why It Was Built

Interest in a dam in Glen Canyon dates to the early 20th century. U.S. Geological Survey hydrologist E.C. LaRue proposed a site as early as 1916–1921, initially more for flood control than long-term storage. Studies continued in the 1920s, but priority went to Hoover Dam (completed 1936) farther downstream.

The decisive driver was the 1922 Colorado River Compact, which apportioned the river’s waters roughly equally between the Upper Basin (Colorado, Utah, Wyoming, New Mexico) and Lower Basin (California, Arizona, Nevada), with measurement at Lees Ferry. The Upper Basin states needed large upstream storage to develop their share for irrigation, municipal, and industrial use without risking failure to meet delivery obligations to the Lower Basin during droughts. Without storage, Upper Basin development would be constrained because water would simply flow downstream to Hoover Dam/Lake Mead.

By the 1940s–1950s, rapid population and economic growth in the West intensified the need. The Bureau of Reclamation advanced the Colorado River Storage Project, a system of dams and reservoirs to regulate flow, store water for beneficial use, provide flood control, reclaim arid lands, and generate hydropower. Hydropower revenues were essential: they would repay construction costs and help finance other Upper Basin projects. Glen Canyon Dam was the centerpiece—the largest storage feature—providing the bulk of the system’s capacity to hold water during wet years for release in dry ones while guaranteeing Lower Basin deliveries.

Congress authorized the CRSP (including Glen Canyon Dam) on April 11, 1956. The project was never primarily a local irrigation scheme; its core purposes were basin-wide storage and power generation.

Site Selection

Engineers and geologists evaluated multiple sites in lower Glen Canyon from the 1920s through the late 1940s (intensive work 1946–1948). Key criteria included:

  • A large reservoir basin capable of holding an immense volume of water.
  • Strong, stable canyon walls and bedrock foundation able to support a high dam.
  • Proximity to quality aggregate (rock and sand) for concrete—available nearby on Wahweap Creek.
  • Economic feasibility and constructability.

An early favored site was about 4 miles upstream from Lees Ferry (which could have held more water), but the chosen site—roughly 15–16.5 miles upstream—was selected for superior foundation rock (Navajo Sandstone cliffs rising nearly vertically) and easier access to gravel deposits. The remote location presented challenges: no nearby rail, and a 200-mile drive to cross from one rim to the other. This necessitated new access roads and the Glen Canyon Bridge (a 1,271-foot steel-arch bridge completed 1959, then among the world’s highest).

The final site sits in a narrow gorge of sandstone and shale, ideal for an arch-gravity design that transfers load into the abutments.

Construction and Filling

Construction began almost immediately after authorization. On October 15, 1956, President Dwight D. Eisenhower triggered the first blast by remote control from the White House. The prime contract went to Merritt-Chapman & Scott in April 1957 (winning bid about $108 million). Work included diversion tunnels to reroute the river, deep excavation to bedrock (about 137 feet), and shaping the canyon walls.

Concrete placement started in June 1960 (first formal pour around June 16–17) and continued around the clock. The dam contains roughly 4.9 million cubic yards of concrete in the structure itself (over 5.3 million including the powerplant)—enough for a multi-lane highway from Phoenix to Chicago. It was built in large blocks and topped out on September 13, 1963, at 710 feet. About 18 workers died during construction. The remote site required creating the town of Page, Arizona, for the workforce.

The river was diverted; the last diversion tunnel was closed on March 13, 1963, and Lake Powell began filling. First power generation occurred in September 1964. First Lady Lady Bird Johnson dedicated the dam on September 22, 1966. Filling to capacity took until June 22, 1980 (about 17 years). Glen Canyon National Recreation Area was established in 1972.

Controversy

The dam was highly controversial. Early CRSP plans included dams at Echo Park and Split Mountain in Dinosaur National Monument. A major campaign by the Sierra Club (led by David Brower), Wilderness Society, and others successfully blocked those, framing them as a threat to national parks. In the political compromise, Glen Canyon Dam proceeded (and was made larger to compensate for lost storage). Many environmentalists later regretted the trade-off, viewing the flooding of Glen Canyon’s scenic, archaeological, and ecological treasures as a major loss—“the place no one knew.” Archaeological salvage projects documented sites before inundation. The dam also fundamentally altered the Colorado River’s flow, temperature, and sediment regime through the Grand Canyon, leading later to the 1992 Grand Canyon Protection Act and adaptive management programs.

Operations and Later History

Lake Powell stores water for Upper Basin use and regulated releases to the Lower Basin. The powerplant (eight generators, original rating ~1,320 MW) has produced billions of kilowatt-hours annually in good years, with revenues supporting CRSP operations, environmental programs, and repayment. Notable events include 1983 floods that damaged the spillways (requiring major repairs) and ongoing adaptive management for downstream ecosystems and recreation.

Current Struggles with Low Water

Prolonged drought, aridification linked to climate change (warmer temperatures, reduced snowpack efficiency, higher evaporation and soil absorption), and overallocation have sharply reduced inflows. Lake Powell has declined dramatically from full-pool levels last seen in the early 1980s.

As of late August 2026, the lake has set new record lows, hovering around 3,518 feet elevation—roughly 22–23% of live capacity and about 180+ feet below full pool. It sits only tens of feet above minimum power pool (3,490 feet), the level at which the penstocks lose adequate submergence and the turbines can no longer generate hydropower reliably. Dead pool (the point at which water can no longer be released by gravity through the outlets) is at approximately 3,370 feet.

Projections in 2026 have warned of potential drops toward or below minimum power pool in 2027 under continued dry conditions, with reduced generation already occurring (output has fallen substantially from historical peaks). Managers have implemented emergency measures: reduced releases from Glen Canyon, increased upstream releases (e.g., from Flaming Gorge), and operational adjustments under drought contingency plans and interim guidelines to protect elevations near or above ~3,500–3,525 feet. Below minimum power pool, releases shift solely to the smaller river outlet works (not designed for sustained primary use), raising concerns about capacity, reliability, sediment, and downstream water delivery. Recreation (marinas, boat ramps) has been heavily impacted, with many facilities unusable.

The situation threatens hydropower for roughly millions of customers in the West, water supplies for agriculture and cities in the Lower Basin, and the broader Colorado River system’s stability. It has prompted study of potential dam modifications for lower-level operations and underscores the original assumptions about hydrology that no longer fully hold. Lake Powell and Lake Mead together hold far less water than in earlier decades, highlighting the ongoing Colorado River crisis.

In summary, Glen Canyon Dam was engineered as a linchpin of 20th-century Western water development—securing Upper Basin rights, enabling growth, and generating power—chosen for its geology and storage potential after careful evaluation. Decades later, it faces the limits of that vision under a drier climate and strained allocation system.

Cocopah I – Colorado River Steamship

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The Cocopah I (often simply called Cocopah) was a stern-wheel paddle steamer and the fifth steamboat to operate on the Colorado River. It was launched in August 1859 and served until 1867.

Construction and Specifications

Built in 1859 in San Francisco for George A. Johnson & Company at a cost of $35,000 (roughly equivalent to over $1 million today), it was the largest steamboat yet placed on the river. Key specifications include:

  • Length: 140 feet
  • Beam (width): 29 feet
  • Draft: Approximately 14.5–19 inches even when fully loaded (sources vary slightly; commonly cited as a mere 19 inches with full cargo)
  • Cargo capacity: Up to about 60–100 tons (it could also tow barges carrying additional tonnage)
  • Type: Stern-wheel paddle steamer with a powerful engine suited to pushing heavy loads against strong currents

It was specifically designed to replace Johnson’s earlier side-wheeler General Jesup and to handle the Colorado’s difficult conditions—shifting sandbars, snags, shallow water (especially in low-water seasons), and strong currents. The stern-wheel configuration and shallow draft made it far better suited to these conditions than earlier side-wheel vessels.

The boat was disassembled in San Francisco, shipped to the mouth of the Colorado River, transferred to another vessel, and taken upriver to Gridiron Landing in Sonora, Mexico, where it was reassembled and launched in August 1859.

Role on the Colorado River

Operated by George A. Johnson & Company (later associated with the Colorado Steam Navigation Company), the Cocopah I played a central role in the commercial and military development of the lower and middle Colorado River corridor during the late 1850s and 1860s.

It ran routes primarily from the river’s mouth/Gulf of California area (and later the safer Port Isabel Slough) northward. Key destinations included Fort Yuma (about 120 miles upriver), La Paz/Ehrenberg area mining districts, Fort Mohave/Hardyville (roughly 300 miles), and occasionally farther during high water (toward Eldorado Canyon or similar points). Wood yards along the river, often staffed by Cocopah laborers cutting cottonwood and mesquite, supplied fuel.

Captain David C. Robinson (a longtime Johnson employee who had previously commanded the exploratory steamer Explorer far upriver) was its primary early captain.

The vessel transported freight, passengers, mining equipment, provisions, and military supplies. It supported:

  • U.S. Army posts (notably Fort Yuma and the newly established Fort Mohave after the 1858–1859 Mohave War)
  • Early gold and silver mining booms along the river
  • Settlement and commerce in what became Arizona Territory and adjacent areas

One of its early major tasks involved supporting military logistics connected with Fort Mohave (established 1859). Steamers including the Cocopah helped move troops, artillery, and supplies upriver when overland routes proved difficult. Freight rates by steamer were dramatically lower than overland teamster rates, helping open the region economically.

The Cocopah I exemplified the shift to larger, more capable stern-wheelers that made regular commercial navigation practical on the challenging Colorado.

Ultimate Fate

The Cocopah I remained in service until 1867. By then it had seen heavy use; accounts note boiler repairs and eventual condemnation as unseaworthy. Its boiler and engine were removed, and the hull was hauled ashore at Port Isabel, Sonora (the company’s port and shipyard settlement near the river mouth). There it was converted into housing for workmen.

It was replaced by the larger Cocopah II (launched 1867 at Arizona City), which continued in the fleet for more than a decade until railroad competition (especially the Southern Pacific bridge at Yuma) ended the main era of Colorado River steamboating.

The Cocopah I is remembered as a pioneering large stern-wheeler that helped establish reliable steam navigation on the Colorado and supported the military, mining, and settlement expansion of the desert Southwest in the mid-19th century. Primary sources for these details include Richard E. Lingenfelter’s Steamboats on the Colorado River, 1852–1916 and National Park Service historical summaries.

Cocopah II – Colorado River Steamship

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Cocopah II was a stern-wheel paddle steamer (sternwheeler) and the tenth steamboat to operate on the Colorado River. It entered service in 1867 as a replacement for the original Cocopah (often called Cocopah I).

Background and Construction

The original Cocopah, launched in 1859, had been one of the largest and most capable vessels on the river but was taken out of service around 1867. Its engine and boiler were removed, and the hull was hauled ashore at Port Isabel, Sonora (Mexico), to serve as housing for workmen at the port and shipyard.

George A. Johnson & Company (later reorganized as the Colorado Steam Navigation Company in 1869) built the replacement, Cocopah II, at Arizona City (present-day Yuma, Arizona) in March 1867. It was launched there in May 1867. The vessel completed Johnson’s main fleet of four steamers (Cocopah II, Colorado II, Mohave, and Nina Tilden) plus six barges that dominated Colorado River traffic from the late 1860s into the early 1870s.

Captain Isaac Polhamus (also spelled Issac in some accounts), the company’s senior steamboat captain and later known as the “Dean of the Colorado River,” commanded Cocopah II. Polhamus had previously captained earlier vessels such as Colorado I.

Specifications

  • Type: Wooden-hulled stern-wheel paddle steamer
  • Tonnage: 231 tons (about 3 tons lighter than the original Cocopah)
  • Length: 147.5 feet (7.5 feet longer than the original)
  • Beam (width): 28 feet (1 foot narrower than the original)
  • Draft: Very shallow (sources note under 20 inches when loaded, suited to the Colorado’s sandbars and fluctuating water levels)
  • Cargo capacity: Reports vary; one account credits it with carrying about 120 tons of freight on less than 20 inches of water.

These dimensions made it well adapted to the lower Colorado’s difficult conditions of shifting channels, sandbars, snags, and seasonal low water.

Role on the Colorado River

Cocopah II operated primarily on the lower Colorado River, running from the river mouth and delta area near Port Isabel, Sonora (on the Gulf of California), northward past Arizona City/Yuma to landings that served military posts, mining districts, and settlements in present-day Arizona, California, and Nevada. Key stops included Ehrenberg (formerly Mineral City), Aubrey City/Landing (near the Bill Williams River), Hardyville, and Fort Mohave.

It transported freight (supplies, mining machinery, ore, provisions, and general merchandise), passengers, and often towed barges to increase capacity. The boat supported the region’s mining booms (including silver and copper discoveries in areas such as El Dorado Canyon and La Paz), military logistics, and growing settlement. Woodyards along the route—frequently staffed by local Cocopah people—supplied fuel. Crews were diverse and included local Indigenous pilots and deckhands valued for their knowledge of the river’s shifting channels.

One notable performance was a reported record-breaking voyage from Aubrey City to Yuma (about 220 miles) in four days. Other accounts note efficient round trips, such as Yuma to Mohave (roughly 232 miles) in five days under capable captains.

By the late 1860s the company was moving substantial tonnage and earning strong profits. Cocopah II formed part of a fleet that, around 1873, included several steamers and barges making dozens of trips annually as far as Ehrenberg and Hardyville.

Decline and Ultimate Fate

The arrival of the Southern Pacific Railroad transformed the economics of river transport. The railroad reached Yuma, bridged the Colorado River at Fort Yuma around 1877, and purchased the steamboat company. Rail service captured most of the long-haul freight and passenger traffic that had previously relied on the steamboats connecting to ocean vessels at the Gulf of California.

Cocopah II was retired in 1879. It was dismantled in 1881. (Some residual upper-river or local service continued with other vessels for a time, but the classic steamboat era on the lower Colorado effectively ended with the railroad’s dominance.)

Cocopah II exemplifies the peak and relatively rapid decline of Colorado River steamboating: purpose-built shallow-draft sternwheelers that opened the desert Southwest to reliable bulk transport in the mid-19th century, only to be rendered largely obsolete by the transcontinental railroads.

Esmeralda – Colorado River Steamship

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The Esmeralda (also spelled Esmerelda) was a stern-wheel paddle steamer that operated on the Colorado River from 1864 to 1868. It was notable as the first opposition steamboat to challenge the monopoly of George A. Johnson & Company, the first to regularly tow large cargo barges on the river, and the first steamboat to reach Callville, Nevada (near modern Lake Mead), in 1866.

Construction and Early Service

Built in 1862 at the 3rd Street shipyard of Patrick Henry Tiernan at Steamboat Point in San Francisco for Captain Washington Pitts, the Esmeralda was originally intended for the Sacramento River and upper San Joaquin River trade.

Specifications

(figures vary slightly by source; those for Colorado River service are most consistent):

  • Type: Stern-wheel paddle steamer
  • Length: Approximately 93 feet (some early accounts list ~100 feet)
  • Beam: About 20 feet (early accounts sometimes cite 24 feet)
  • Hold depth / draft: Hold ~3.5 feet deep; draft about 33 inches
  • Cargo capacity: Roughly 50 tons on the steamer itself; capable of towing a barge with up to 100 tons
  • Other: One deck and a square stern in original configuration

It was smaller than many of Johnson’s boats but relatively powerful for its size, making it well-suited for towing.

Role on the Colorado River

In early 1864, amid complaints about high freight rates and slow service from Johnson & Company’s monopoly (especially after mining booms increased demand), San Francisco merchants backed an opposition line. Captain Thomas E. Trueworthy’s Union Line acquired the Esmeralda. It was sent south under Captain Charles C. Overman, accompanied by the Victoria (a four-masted schooner converted from a barge, intended as a store ship at the river mouth). The Victoria was soon destroyed by the tidal bore.

At the mouth of the Colorado, Overman built the Black Crook, the first large tow barge used on the river (about 128 × 28 feet, ~100-ton capacity). Barges were towed on a ~100-foot cable attached amidships to avoid fouling the stern wheel, with a helmsman steering the barge in the steamer’s wake.

In early May 1864, Trueworthy took the Esmeralda (towing the Black Crook) upriver to Fort Yuma in just 3 days and 8 hours—demonstrating competitive speed even while towing. This challenged Johnson’s dominance and helped clear freight backlogs. Another rival, the Nina Tilden, soon joined the opposition. Competition intensified (Johnson responded with the powerful Mohave), rates fell, and excess capacity appeared by late 1864.

In summer 1865 the opposition boats consolidated into the Pacific and Colorado Steam Navigation Company (still under Trueworthy, with San Francisco backing). The key ambition was reaching Callville (established by Mormons under Anson Call as a potential “back door” port for Utah settlements, which could cut overland freight costs dramatically). An 1865 attempt failed at Roaring Rapids in Black Canyon.

In summer 1866, during high water, the Esmeralda (under Captain Robert T. Rogers, Trueworthy’s former first mate, and accompanied by promoter “Steamboat Sam” Adams) tried again with a barge and about 90 tons of freight. The three-month voyage was difficult due to scarce firewood (limiting power) and low water in places. At what became known as Ringbolt Rapids, the engine lacked sufficient power; a ringbolt was set in the canyon wall and the boat was winched through using its capstan. On October 8, 1866, it reached Callville—the farthest steamboat navigation point achieved on the lower Colorado at that time. The Arizona Legislature later formally thanked Rogers (and Captain William Gilmore) for the accomplishment. Goods from the trip remained in storage into early 1867 before being sold and hauled overland to Salt Lake City.

Ultimate Fate

Despite the Callville triumph, the company was deeply in debt. Upon returning downriver, the Esmeralda was seized by the Yuma County sheriff for unpaid debts. It passed briefly through the hands of the Arizona Navigation Company (an attempt by creditors to continue operations). In fall 1867 both the Esmeralda and Nina Tilden were sold to George A. Johnson & Company. The Esmeralda was dismantled in 1868.

Its short but eventful career helped break the early monopoly on Colorado River shipping, pioneered barge towing that became standard practice, and demonstrated the practical (if seasonal and difficult) upper limit of steamboat navigation toward the Mormon settlements—though the hoped-for major Utah trade route never fully materialized due to water conditions, costs, and later railroad competition.

General Rosales – Colorado River Steamship

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The General Rosales was a short-lived propeller-driven (screw) steamship associated with the lower Colorado River in 1878, owned by the Gulf of California Steamship Company. It was launched at Yuma, Arizona Territory, in July 1878 and sent to Guaymas, Sonora, Mexico, by September 1878.

It stands out in Colorado River steamboat history because nearly all vessels that operated successfully on the river from 1852 onward were shallow-draft paddle-wheelers (side-wheelers early on, then primarily stern-wheelers). These were designed for the river’s shifting sandbars, low water, strong currents, and hazards. The General Rosales was one of the rare screw-propelled vessels listed among them.

Specifications and Design Principles

Available records give these basic dimensions and characteristics:

  • Type: Propeller-driven (screw steamer)
  • Tonnage: 54 tons
  • Length: 96 feet
  • Beam: 16 feet
  • Draft: 4 feet
  • Launched: Yuma, Arizona, July 1878
  • Owner: Gulf of California Steamship Company
  • Disposition: Transferred to Guaymas, Sonora, September 1878

Design context on the Colorado River: Successful river steamers emphasized extremely shallow draft (often 12–30 inches loaded for stern-wheelers such as the Colorado, Mohave, or Gila series) so they could navigate sandbars and low water while carrying freight on deck. Stern-wheelers proved superior to side-wheelers for the upper river’s rapids and shallows. Engines were typically moderate horsepower, fueled by local wood (mesquite or cottonwood), and hulls were often built in sections in San Francisco or elsewhere, shipped by sea, and assembled at the river mouth or Yuma.

A propeller design with a 4-foot draft was less ideal for the shallow, silt-laden lower Colorado. Screw propellers perform better and are less vulnerable in deeper, clearer water; in shallow sandy conditions they risk fouling, damage, or reduced efficiency. This helps explain the vessel’s very brief time on the Colorado itself and rapid transfer to Guaymas. It was better suited to Gulf of California coastal or harbor work than sustained river navigation. Exact engine details, builder, and construction method (whether assembled from parts at Yuma or built locally) are not well documented in surviving secondary sources.

The name honored General Antonio Rosales (a Mexican liberal military leader from Sinaloa active during the French Intervention era of the 1860s), reflecting the company’s orientation toward Mexican ports and trade.

Historical Context and Role in Trade

Steam navigation on the Colorado River began in 1852 primarily to supply the isolated U.S. Army post at Fort Yuma more cheaply than overland wagon freight from California. George A. Johnson & Company (later the Colorado Steam Navigation Company) dominated the trade for decades with a fleet of paddle-wheelers that carried military supplies, mining equipment and ore, passengers, and goods supporting settlement and mining booms as far upstream as the Virgin River area. By the mid-1870s the company handled thousands of tons of freight annually.

Railroads began eroding this monopoly: the Southern Pacific reached Yuma in 1877 and bridged the river, sharply reducing the economic advantage of river transport for many routes. River steamers continued for upper-river and local freight, mining support, and residual traffic for some years, but the peak era was ending.

The General Rosales appeared in this transitional period. The Gulf of California Steamship Company (sometimes referenced in connection with subsidized Mexican “Fast Line” or Gulf of California services around 1877–1878) operated with an eye toward linking the Colorado River / Yuma area with Gulf ports, especially Guaymas. Mexican government subsidies supported certain American-linked steam lines serving Pacific and Gulf of California ports in these years.

Its role in expanding Colorado River trade was limited and short-lived:

  • It briefly operated in the Yuma area in mid-1878, at a time when river traffic still connected to ocean vessels at the Colorado River Delta / Port Isabel area and supported residual commercial activity.
  • Its prompt transfer to Guaymas indicates primary intended use on Gulf routes rather than sustained upriver service. This supported broader regional commerce between Arizona Territory, the Colorado Delta, and Sonoran/Gulf ports (Guaymas being a key Mexican port for Sonora trade, mining, and coastal shipping).
  • In the larger picture of Colorado River commerce, it represented a minor experiment with propeller propulsion and an attempt to maintain or redirect river-linked trade toward Mexican Gulf connections as railroads displaced traditional river freight.

Unlike the long-serving stern-wheelers of the Colorado Steam Navigation Company (Colorado II, Mohave II, Gila/ Cochan, etc.), the General Rosales left little operational record on the river itself. Primary detailed accounts (such as those drawing on Richard E. Lingenfelter’s Steamboats on the Colorado River, 1852–1916) list it but provide few additional operational narratives. Commercial steam navigation on the lower Colorado effectively ended after the Laguna Dam closed the river to through traffic in 1909.

Summary

The General Rosales was a modest 54-ton, 96-foot propeller steamer launched at Yuma in July 1878 by the Gulf of California Steamship Company. Its relatively deep 4-foot draft and screw propulsion made it better adapted to Gulf of California waters than to the shallow, changeable Colorado River, leading to its transfer to Guaymas within two months. It played only a fleeting role in Colorado River trade during the onset of the railroad era and is best understood as a vessel intended to help connect remaining river commerce with Mexican Gulf ports rather than as a major contributor to the expansion of upriver trade that characterized the paddle-wheeler fleets of the 1850s–1870s. Detailed contemporary operational logs, precise construction records, and cargo manifests for this specific vessel remain scarce in readily available sources.