Laguna Diversion Dam

Laguna Diversion Dam

Overhead of dam facing north
Location of Laguna Diversion Dam in USA California
Location Imperial County, California / Yuma County, Arizona, USA
Coordinates 32°49′23″N 114°29′39″W / 32.82306°N 114.49417°W / 32.82306; -114.49417Coordinates: 32°49′23″N 114°29′39″W / 32.82306°N 114.49417°W / 32.82306; -114.49417
Construction began 1903
Opening date 1905
Operator(s) U.S. Bureau of Reclamation
Dam and spillways
Type of dam Rock-fill weir, concrete surface
Impounds Colorado River
Height 43 feet (13 m)
Length 4,780 feet (1,460 m)
Spillway type Controlled service

The Laguna Diversion Dam is a rock-filled diversion dam on the Colorado River. It is located 13 miles northeast of Winterhaven, CA–Yuma, AZ on Imperial County route S24. Constructed between 1903 and 1905, the dam was the first dam built on the Colorado River and subsequently ended boat travel to the north.

History

After the passage of the Reclamation Act by the US Congress in 1902, the U.S. Bureau of Reclamation began constructing the dam under the Yuma Project in 1903. This project was the first development of the U.S. Reclamation Service along the Lower Colorado River and featured the Laguna Diversion Dam, a pumping station and a series of canals.[1] On July 6, 1905 the contract to build the dam was awarded to J. G. White and Company who started construction less than two weeks later. Deliveries of cement were a problem as they had to be delivered to Yuma by rail and to the construction site by wagons or steamboat. Poor rock quality at local quarries also posed a problem that consistently delayed construction, 50% of the weak rock was unusable. Even after their contract was supplemented to encompass the rock quality delays, J. G. White and Company still did not meet their deadline and the Bureau of Reclamation took over construction in early 1907.[2]

To solve the cement delivery problems, the Bureau of Reclamation had built a levee on the California side on the dam that was topped by a rail-line by March 1908. Beforehand, they had also gained the cooperation of the Southern Pacific Railroad who agreed to deliver cement directly at the dam site. The rock problem was solved when the Bureau raised the upstream and downstream cofferdams with rock waste and topped them with rail lines that could deliver rock-fill much faster. By December 1908, the water bypass around the dam was complete and workers began to pour the rock-fill. Three large concrete walls supported by 6-inch sheet-wood pilings were built across the river for the dam's foundation. Rock-fill was placed in between and on the outsides of these walls for support. The California sluiceway consisted of three iron gates while the Arizona had one. Mexican-Americans mostly worked on the dam while a few Native American Indians did as well. Skilled white-labor worked in the cooler months.[2]

The Laguna Dam's design and size made it a peculiar structure for the time. The dam, a weir, was merely 43 ft. tall, almost two-thirds of which were built below the riverbed. Subsequently, the dam only raised the river ten feet. Modifications to the dam's downstream talus were done between 1923-1924.[2] After the creation of the Imperial Dam 5-miles upstream, the Laguna Diversion Dam was no longer needed and its California diversion outlets were closed on June 23, 1948. Since then, the dam serves to regulate the outflows of the Imperial Dam and often does not impound a large reservoir.[3]

Swastika design

The Laguna Dam was decorated with numerous swastikas, thus developing the eventual nickname "Swastika Dam." The swastikas present on this structure were not put there for any sort of National Socialist ("Nazi"), or otherwise racist and/or socio-political reasons. They were placed there prior to Adolf Hitler's effectively having altered the popular meaning of the swastika within Western societies.

Fish species

See also

References

  1. ↑ "Yuma Project". U.S. Bureau of Reclamation. Retrieved 13 July 2010.
  2. 1 2 3 A. Stene, Eric. "YUMA PROJECT AND YUMA AUXILIARY PROJECT" (PDF). History of Reclamation Projects. U.S. Bureau of Reclamation. Retrieved 14 July 2010.
  3. ↑ "Laguna Diversion Dam". U.S. Bureau of Reclamation. Retrieved 13 July 2010.
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