Category

Topic
American Avocet on managed, former salt ponds in the South Bay. Photo: Roopak Bhatt, USGS
26
May

One-of-a-Kind Stories

Our magazine’s media motto for many years has been “Where there’s an estuary, there’s a crowd.” The SF Estuary is a place where people, wildlife, and commerce congregate, and where watersheds, rivers and the ocean meet and mix, creating a place of unusual diversity. In choosing to tell the Story of the Estuary in just nine major topics and a few browsing categories, so many unique stories from our archives have been missed. Like tales about the region’s various research vessels that collect data on conditions in the water or trawl for fish of management concern. Or the stories bringing to life the experiences of people swimming or fishing or boating on the water, or walking the trails and watching...
Read More
dam spillway oroville
26
May

Supplying Water

Ever since the state and federal water projects were built in the 1930s and 1940s, California has captured snowmelt in foothill reservoirs, and moved the fresh water from dam releases and river outflows to parched parts of the state via aqueducts hundreds of miles long. A convoluted system of ancient water rights and newer mandates governs who gets what water and how much. An equally complex infrastructure – including gates, pumps, screens, and barriers – is deployed to deliver the fresh water to farms, cities, and industries, sometimes far from headwater sources. The state’s infamous war over water continues, whether it’s over fish V farms, a peripheral canal or twin tunnels, or the perception that flows out to the Pacific...
Read More
25
May

Tackling Pollution

Though the Clean Water Act did an amazing job of reducing wastewater and stormwater pollution of the SF Estuary, some contaminants remain thorny problems.  Legacy pollutants like mercury washed into the watershed from upstream gold mining, PCBs from old industrial sites, and selenium from agricultural drainage in the San Joaquin Valley, linger in the sediments, nearly impossible to clean up.  Emerging contaminants from contemporary lifestyles such as herbicides, flame retardants, and fire-fighting foams are being linked to human health problems, while microplastics are turning up everywhere from fish guts to creek bottoms to newborns. More recently, nutrients from both farm and sewage discharges have become a particular challenge for the Estuary. Long protected by its sediment-clouded waters, a recent clearing...
Read More
image of bioretention site
25
May

Greening Stormwater

When rain runs off into the Estuary from streets, parking lots, and other hard surfaces, it can carry a toxic soup of contaminants—oil, grease, and myriad other chemicals that may start off as pollutants in the air but end up on the ground where they can they then be washed into water bodies in storms. For the past three decades, Bay Area scientists have tracked and analyzed these contaminants—to determine exactly what they are and how they affect water quality while water quality agencies have developed increasingly stringent regulations—such as TMDLs, or Total Maximum Daily Loads and other mechanisms—to try to control them. In more recent years, the practice of Green Stormwater Treatment—the use of soil and plants to slow,...
Read More
salmon
25
May

Sustaining Salmon

By the time Estuary debuted in 1993, the Central Valley’s once abundant runs of Chinook salmon had been severely depleted by dams, diversions, pollutants and predation by non-native fish. Sacramento River winter-run fish were federally listed as endangered in January 1994; the Central Valley spring run was listed as threatened in 1999 and the fall run is identified as a species of concern. Protecting and rebuilding these populations has been a lodestar for many, if not most, of the efforts to restore the Bay and Delta, beginning with 1992’s Central Valley Project Improvement Act. Over the decades, armies of scientists, engineers and water managers have sought to better understand and mitigate the threats to this iconic fish, while lawyers, activists...
Read More
25
May

Restoring Habitats

Early efforts to restore the SF Estuary, before the federal Clean Water Act and Endangered Species Act changed management priorities in the 1970s, focused on preserving marshes for waterfowl hunting, protecting river reaches for fishing, and growing trout and salmon in hatcheries. By that time, the estuarine ecosystem had been so severely altered by draining, diking, damming, farming, urbanization, species invasions and water supply projects that there was little left to restore. Restoration to some pristine former state was soon deemed an impossibility. Nevertheless, new mandates forced planners to consider restoring a variety of habitats used by endangered fish, birds and wildlife, to manage dam releases to provide flows and cold water to migrating species, and to reduce pollution and...
Read More
25
May

Controlling Invasions

San Francisco Bay has been called the most invaded Estuary in the world. From Chinese mitten crabs to zebra mussels from Europe to Atlantic cordgrass from the East Coast, the Estuary has been colonized by myriad animals and plants from other parts of the country and world. Water hyacinth now clogs Delta waterways; Asian clams regularly consume all the fish food in the water column; water primrose is carpeting over native flora. Many alien animals arrived in ships’ ballast water or aquarium water dumped by unknowing home hobbyists while plants like Atlantic cordgrass were introduced intentionally by the U.S. Army Corps of Engineers in restoration projects, from which the plants then hybridized with Pacific cordgrass, creating a menacing invader. But...
Read More
Fish
09
May

Chasing Flows

How much of the water from the Estuary’s creeks and rivers should be left to run into and through the Delta to support fish and protect water quality—and how much can be held behind dams or diverted to irrigate farms and supply cities—has been a central management question for decades, and has informed several ambitious efforts to repair the Estuary’s decimated ecosystem.  In 1992, the same year that ESTUARY began publication, Congress passed the Central Valley Project Improvement Act, allocating 800,000 acre-feet of water per year to the environment and kicking off years of squabbling and litigation over how the water was counted and when and where it could be used. Later efforts included the 1994 Bay-Delta Accord, and the...
Read More
Delta Smelt
09
May

Saving Smelt

Ever since this tiny, 2-3-inch-long, silver fish was first listed as threatened in 1993, and then later as endangered in 2009, efforts to understand and protect Delta Smelt have been central driver of SF Estuary management efforts. Over the decades, as the species has become increasing scarce, the focus has changed from understanding how the smelt use Estuary habitats, and its lifecycle, as well as how to keep it away from the water project pumps and enhance its estuarine habitats (water quality standard known as “X2”) to fish V farms water wars politics and more recently final throws efforts to protect the gene pool in labs, culture fish, and then release smelt back into the wild. To read about Delta...
Read More