These salt ponds viewed from above are in San Francisco Bay, California. When I flew into San Francisco, I wondered what these colorful ponds were and had to look it up.
Salt water is collected in a series of ponds and as it evaporates, it turns into a thick layer of crusty salt. Initially, the color is green or brown but it becomes more pink when the water evaporates. The last stage is called “pickle” brine.
Though most people call them salt ponds, they are called “crystallizer beds” by Cargill, Inc., who harvests the salt. The beds are rolled, graded, sloped, and compacted.
Historically, Native Americans collected salt in this area. During the Gold Rush era of the 1850s, demand increased dramatically. Before refrigeration became common, food was preserved in salt. Salt-making continues to this day. After 80 percent of San Francisco Bay marshes were lost to development, there was a shift towards habitat restoration. Restoring those marshlands is part of the largest project on the West Coast.