Restoration Reflections: A Hundred Ways to Cherish the Estuary

Delta Landscapes & Waterways



28
Mar

Restoration Reflections: A Hundred Ways to Cherish the Estuary

Restoration is a powerful concept. Physically it entails putting something back, making it right again; emotionally it requires hope for the future, a sense of something worth doing.  In the Estuary, restoration is no longer about recreating some pristine ecosystem that once was. The vast marshes that carpeted the Delta and circled the Bay before Europeans arrived out West are long gone; the great rivers spilling fresh water and salmon downstream are a shadow of their former selves; the myriad creeks and sloughs offering migratory paths and habitats for so many estuarine creatures are now laced with obstacles and lined with concrete.  But for some time now, the call to restoration work has been growing. People in all walks of...
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Ducks. Photo: Rick Lewis
21
Mar

Delta Restoration Baseline Revealed

When the Delta Stewardship Council amended its Delta Plan and established a goal of restoring 60,000 to 80,000 acres of wetland above a 2007 baseline by 2050, it raised some fundamental questions: How much of that goal has already been met, and where? A recent study, presented at the Delta Plan Interagency Implementation Committee Restoration Subcommittee’s first-ever Delta Restoration Forum in February, provides some answers. The amendments to Chapter Four of the Delta Plan, which focuses on protecting, restoring, and enhancing the Delta ecosystem, synthesized 14 existing agency reports and other documents in establishing the 2050 targets, which are deemed necessary to achieve the larger goal of restoring a functioning ecosystem by the end of this century. However, “there wasn’t...
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American Avocet on managed, former salt ponds in the South Bay. Photo: Roopak Bhatt, USGS
21
Mar

Riding the Restoration Waves: My Estuarine Journey

After 16 years of working in the San Francisco Estuary, including serving as a manager for key regional agencies, I have ridden several waves of restoration. I’ve seen big changes in how restoration is done, who does it, and who benefits—whether it’s a fish or bird on the verge of extinction or a young person from an urban community learning green job skills on the shoreline. Our view of what matters continues to expand as connections that were once cloudy—between habitat restoration and environmental justice, between upland and bay habitats—come into focus. We’re not just trying to create small patches of tidal marsh but to piece together a huge mosaic of habitats from working lands to wetlands. We now know...
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Los Rios Check Dam open for fish passage. Photo: Max Stevenson
21
Mar

Reconnecting Putah Creek with the Ocean

After decades of restoration, recent Chinook salmon runs in Putah Creek have reached 1,800, producing young that swim toward the ocean by the tens of thousands. But, says Putah Creek streamkeeper Max Stevenson, this growing population still faces considerable obstacles.  Putah Creek flows from headwaters in the North Coast Ranges to the Toe Drain of the Yolo Bypass, and was dammed near Winters in the 1950s to divert water for Solano County. Salmon began coming to the creek after settlement of a lawsuit in the year 2000 that stipulated releasing water for fish as well as optimizing spawning grounds.  Salmon need loose gravel to dig spawning pits, or redds, that are up to six feet across. “They flop over and...
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Seining Luco pond. Photo: Brian Williamshen
21
Mar

Suisun’s Working Landscapes Support Fish

On a sunny spring day in 2014, two UC Davis PhD candidates in waders pulled a 30-foot seine through Luco Pond (also known as the Potrero Duck Club) in Suisun Marsh. Luco Pond is within the Nurse-Denverton Slough Complex where duck clubs use tidal gates to control water exchange. After 45 minutes of counting diminutive fish, Brian Williamshen and Melissa Riley were excited to tally more than 6,900 sticklebacks, a thorny-backed native fish in the Sacramento-San Joaquin River Delta. “There was definitely a moment of excitement,” Williamshen says. “But when we were at our 50th fish, and the little spines kept poking us in the fingers, our emotions shifted to like, oh man, we still have hundreds more to go!”...
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Vogel Island after breaching during first filling. Photo: EIP/Bill Arnerich
21
Mar

Lookout Slough Restoration will be the Delta’s Largest Yet

When the restoration of Lookout Slough is complete, Lookout Slough will be no more. Created to provide water for a century-old duck-hunting club, the human-made canal will be filled in as part of a $119 million, 3,400-acre tidal wetlands restoration, the largest ever in the Sacramento-San Joaquin Delta. “Drought and climate change have elevated the importance of these types of multi-benefit projects,” said Karla Nemeth, director of the California Department of Water Resources, when the project broke ground last June. “This project will reduce flood risk for communities in the Central Valley and create much-needed habitat for Delta smelt and other endangered and threatened fish species.” By their expected completion in late 2024, the new tidal wetlands will replace former...
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Aerial view of Bouldin Island. Courtesy MWD
21
Mar

An Inclusive Vision for Bouldin Island

Over resistance from local governments and environmental organizations, in 2016 Southern California’s Metropolitan Water District purchased five islands in the Sacramento-San Joaquin River Delta. While it wasn’t immediately clear what the powerful water agency intended for these islands, the move reminded some Californians of the “Wild West” years of water rights claimed by surreptitious land purchases. Now, years later, it appears the District is making good on that purchase by taking a leading role in Delta restoration efforts. The Delta Islands Adaptations project, funded through a watershed-restoration grant from the California Department of Fish and Wildlife, has zeroed in on Bouldin Island (the other four islands purchased at the same time were Webb Tract, Bacon Island, Holland Tract, and parts...
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Shorebirds-on-1-restored-habitat_U.S.-Geological-Survey_William-Chan
21
Mar

Wetland Restoration is for the Birds

It’s high tide at Eden Landing Ecological Reserve, on San Francisco Bay due west of Union City, and Nathan Van Schmidt is counting birds on Pond E9 with both hands. Van Schmidt, science director for the San Francisco Bay Bird Observatory, has a clicker in his right hand to track American Avocet, and another in his left for Northern Shoveler. “Wetlands can support an incredible biomass of birds,” he says. “And Eden Landing is one of the birdiest places in the Bay.” The Observatory, a local nonprofit bird conservation organization, helps the South Bay Salt Pond Restoration Project to monitor how birds are doing on 82 managed ponds and restored tidal wetlands. This pond, with water levels maintained at about...
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31
Aug

In the absence of a government program to contend with harmful algae blooms (HABs) in the Delta, a loose coalition of academics and environmental and community groups has been studying their spread and potential health impacts both from ground level and from the air.

San Francisco Baykeeper has been sending up drones to monitor eight sites between Discovery Bay and downtown Stockton, as well as photo-documenting the spread and intensity of HABs from airplanes flown by Lighthawk Conservation Flying. At the same time, volunteers with Restore the Delta have been conducting water quality testing for HABs and the toxins they produce. “The airplane and drones together allow us to get a really broad geographic understanding of where these neon green HABs are occurring, says Baykeeper’s Jon Rosenfield. “That paired with site specific water quality testing that Restore the Delta is doing allows us to get different spatial scales of analysis of this problem.” These HABs, which Rosenfield says occur during the late-spring and summer...
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31
Aug

Researchers are applying a novel genetic technique as part of the development of an annual estimate for the number of juvenile spring-run Chinook salmon entering the Delta.

The technique, spearheaded by geneticist Melinda Baerwald from the California Department of Water Resources, allows researchers to accurately distinguish young spring-run salmon from other runs by targeting DNA sequences specific to these fish.   In a paper published in San Francisco Estuary and Watershed Science, lead authors Baerwald and Peter A. Nelson explain some of the challenges of developing this estimate, called the spring-run juvenile production estimate. A key hurdle is differentiating spring-run fish from salmon that migrate during other seasons. Unlike juvenile salmon from the winter run, spring-run juveniles are hard to identify using the conventional length-at-date approach, which determines age and spawning migration season based on size.   “There’s nothing visually about a spring-run salmon that distinguishes it...
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31
Aug

Groundwater pumped from subsided islands back into Delta channels through 200 or more active outfalls can be laden with excess nitrogen transported from island soils, report the authors of a new study.

The Sacramento-San Joaquin Delta contains more than 50 peat islands. Most have subsided—some as much as three meters — as a result of drainage for farming, and must maintain artificial water tables below the land surface via managed pumping. According to researchers from the University of California at Santa Cruz and the US Geological Survey, these pump stations are an underappreciated source of nutrients in nearby waters, with potentially significant implications for habitat and water quality.   To get a sense of how much nitrogen is leaving the islands and when, the researchers measured monthly discharge along with nutrient and trace element concentrations in drainage from three Delta islands over the course of nearly a year and a half, then...
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31
Aug

Light and nutrients are the staples of every phytoplankton production recipe, but wind and tides in the Delta affect phytoplankton production too, say researchers.

Several projects in the lower Sacramento River and Delta have been exploring strategies for increasing the quantity and quality of food for migratory and resident fish. As part of a broader whole-ecosystem experiment that added nitrogen into the Sacramento River Deep Water Ship Channel, Leah K. Lenoch and colleagues at USGS and UC Davis looked into the channel’s hydrodynamics to explore whether the environmental conditions there hold promise for increasing the quantity of phytoplankton (the microscopic algae at the base of the food web). They knew that turbid and well-mixed waterways, including parts of the San Francisco Estuary and Delta, are not very productive because phytoplankton don’t get enough light and are at the mercy of invasive clams. However, where...
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16
Jun

Listening to Vital Voices

Jessica Rudnick’s first love was earth science. But after discovering that people’s beliefs and behaviors were key to solving environmental problems, she fell for social science. Now, as the California Sea Grant extension specialist for the Delta, Rudnick is working to better integrate local people into plans for the region. Understanding the needs of people who live, work, and recreate in the Delta could make the difference between fixes that are rejected or embraced.  Delta planning has historically focused largely on ecological health. But, like many estuarine areas, the Delta is a lived-in landscape. “There are socially embedded challenges that play out in environmental issues,” she says. “You can’t just throw more data and research at a problem and think...
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16
Jun

Reorienting to Salmon Recovery

California’s disappointing history of salmonid recovery programs has motivated a group of scientists from public water agencies and environmental conservation groups to step back, dream big, and take a new path forward. This group wants to abandon familiar heated dialogues and litigious relationships and try a new approach toward fish recovery based on collaboration, common interests and science.
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Adrienne Ernst among the Phragmites. Photo: Michael Adamson
16
Jun

Living with a Novel Landscape: Suisun Evolves

Morning at Suisun Marsh is a living watercolor with a soundtrack. Miles of tule and pickleweed populate the foreground, split by canals glinting silver from the sun. In May, the hills undulate across the northern boundary in classic California gold. A red-tailed hawk’s iconic hoarse screech punctuates the insectine buzz as it takes off from a powerline. At 7:40 AM, it’s already 72 degrees and there’s no trace of a breeze. I’ve come to visit the Marsh from downtown Oakland seeking to learn from biologists, hunters, and land managers what’s at stake in the myriad battles with rising seas, worsening drought, and, especially, encroaching invasive species and what makes it such a singular, attractive landscape.  Indeed, the pastoral foreground is...
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Baldocchi at the end of one of the levees breached to restore tidal action at Dutch Slough. Photo: Janet Byron
16
Jun

Sniffing the Delta for Greenhouse Gases

Dutch Slough in Oakley, on the southern edge of the Sacramento-San Joaquin Delta, is less than a mile from where biometeorologist Dennis D. Baldocchi (above) grew up on his parents’ orchard and fished with pals in nearby Marsh Creek. In October 2021, the California Department of Water Resources breached the levees here, restoring nutrient-rich tidal flows to degraded ranchland. Early in the 20th century, Baldocchi’s father grew dry beans and sugar beets on the peat soils of the Delta’s Liberty Island, and his aunt’s family raised asparagus, sugar beets, and corn on Sherman Island. In 1952, his dad started growing almonds and walnuts at the junction of Sellers Avenue and Cypress Road in Oakley. “My family mined the Delta for...
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subisdence on 4 delta islands map
13
Apr

Asked to suggest an appropriate future for four Delta islands owned by the Metropolitan Water District, it’s difficult not to want the moon.

Why not richer rice fields, more wetlands, better boat launches, extended trails, even eco-tourism? ? A new survey for the Delta Islands Adaptation Project, funded by a Prop 1 Watershed Restoration Grant, wants the public’s opinion on the importance of 10 possible land-use objectives leading to the selection of one of the four islands for improvements. As your blinking cursor hovers over a satellite image of Bouldin, Bacon, Webb, and Holland Tracts, the survey lays out all that the experts know already: Holland is the least subsided; Bouldin the most accessible by road; Webb the best candidate for making more fish food, and more. “The Central Delta has some of the most critical landscapes in the state, and also some...
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chart by Hutton
13
Apr

An examination of 50 years of records reveals an apparent seasonal bias in estimates of freshwater flow from the Delta to the San Francisco Estuary.

The seasonal bias suggests flows were overestimated during the summer months and underestimated during the winter. Estimates of Delta outflow use a measurement called net Delta outflow index (NDOI), which is determined by taking the amount of Delta inflow, from sources such as the Calaveras, Sacramento, and San Joaquin rivers, and subtracting Delta exports, a direct measurement, and net Delta channel depletions. A team led by TetraTech’s Paul Hutton compared NDOI estimates against measured Delta outflow at four points, as well as against the Estuary’s historical salinity record. The study, which appears in the December 2021 issue of San Francisco Estuary and Watershed Science, focused on net Delta channel depletions, which are determined indirectly and involve considerations such as land...
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diagram of fish net trawl
13
Apr

Fish monitoring surveys in the San Francisco Estuary net different numbers of different fish species depending upon when and how they sample.

According to a new study published in San Francisco Estuary and Watershed Science, even surveys that target the same part of the water column can come up with significantly different catches. The study’s authors analyzed decades worth of data from the California Department of Fish and Wildlife (CDFW) Fall Midwater Trawl, which spans from San Pablo Bay to the upper Delta; CDFW’s San Francisco Bay Study midwater and otter trawls, covering the South Bay to the central Delta; and the UC Davis Suisun Marsh Fish Study, also an otter trawl. The two midwater trawls, which sample the middle of the water column, were found to be generally more successful at catching pelagic (open-water) fish like Delta smelt and American shad...
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field in delta with irrigation
13
Apr

Rain or shine, farmers in California use about the same amount of water every year, while residential water use varies considerably with precipitation.

A research team led by UC San Diego’s John Helly processed 15 years’ worth of water-use data from the state’s Department of Water Resources, reporting in the March 2022 issue of San Francisco Estuary and Watershed Science that while “the annually precipitated water supply in the Bay-Delta” varied by 30%, agricultural water use scarcely changed year to year. “The water management system maintained nearly constant agricultural water use even in periods of intense drought, with year-to-year variation of about 7%,” the authors wrote. Residential water use showed more variability, swinging by 20% from one year to the next–mainly, the authors theorize, as the result of voluntary and mandated water conservation during droughts. Though Helly says he had no expectations of...
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