Millions of years ago, dinosaurs walked the Earth and the Salton Trough was at the bottom of the ocean. The Salton Trough was part of the Gulf of California until four million years ago when sediment from the Colorado River built up and closed the gap.1 Today, there are 150 miles between the Salton Sea and the Gulf of California, but evidence of their former connection can be found in the soil.
The land around the Salton Sea is composed of minerals of marine origin; many of these minerals are salts. A salt is a compound made up of positively (cation) and negatively (anion) charged ions. Sodium chloride, known as table salt, is the primary salt in the ocean and it dissolves readily in water to form a sodium cation and a chlorine anion. Other chemical components of seawater include magnesium, calcium, and potassium cations and sulfate anions. The Salton Sea has many of the ions of seawater in addition to phosphate and nitrate nutrients from fertilizers that are flushed into the Sea.2 Together, the total dissolved salt content of a body of water is called salinity. Continue reading “The Science of Salt”
Agriculture in the Imperial Valley and the Salton Sea has a long and sordid past. The Salton Sea is located in the Imperial Valley, a region of California where the dominant economy is the production of crops. In order to create this farming oasis in the middle of the desert, 917,540 million gallons of water a year must be shunted to the Imperial Valley from the Colorado River. This is the beginning of the story of how an agriculture revolution has created and changed the largest body of water in California.
The Salton Sea was originally formed in 1905 when massive rain and snowmelt overwhelmed the dams designed to contain the Colorado River and poured into the empty Salton sink. The dams were repaired quickly, but the Sea had already filled. By the 1930s water levels had noticeably dropped and most believed that the sea would naturally dry up. However, around the same time, cotton farming and the massive water shuttling began in the Imperial Valley , refilling the Sea with agricultural run-off. Continue reading “Agriculture in the Imperial Valley: A Tale of Two Seas”