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Historic California floods of 1861-62 featured 8 weeks of atmospheric rivers

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Historic California floods of 1861-62 featured 8 weeks of atmospheric rivers


SACRAMENTO, Calif. – Imagine Disneyland under feet of water for weeks. Rivers swelling to levels never seen before and never seen since. Days of rain stretch into weeks as floodwaters rise to epic levels.

California may have endured an onslaught of tropically-infused atmospheric river storms that filled the calendar for months at the end of 2022 and the start of 2023 and is staring at another atmospheric river this weekend, but those storms pale in comparison to the historic floods during the winter of 1861-1862.

The storms were a recipe for disaster for a young region that had recently been settled. Abraham Lincoln was president at the time, and America was embroiled in the first months of the Civil War. But out West, California’s population was bulging to about a half million in the wake of the great Gold Rush about a dozen years prior.

7 FACTS ABOUT FLOODPLAINS

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Many of the newcomers settled in flat areas near the river for water supply and ease of commerce and transportation, with mining, ranching and agriculture the main fuel for the economy. In the East, where many came from, floods occurred with thunderstorms in spring and summer, not during the fall and winter. They were also not accustomed to living near large mountain ranges that concentrate rainfall into confined riverbeds. 

So when the first of a series of likely atmospheric river-type storms hit the West Coast on Dec. 2, 1861, it was a new experience for many. 

30-foot-deep water in California’s Central Valley

The storm first struck Oregon’s Willamette Valley and southern Washington Territory, according to research by meteorologist Larry Schick. The temperature reading at Fort Vancouver in Washington Territory was 58 degrees at 7 a.m. – well above average and signaling a warm, tropically-infused atmospheric river-type storm that would have carried plenty of moisture.

Shick found the storm would dump so much rain it would flood the Willamette River with raging waters equal to the flow of the mighty Mississippi River – a river 100 times larger.  Now 162 years later, that storm still remains the flood of record for the Willamette. It’s not alone.

Schick found the storm eventually pushed south and redeveloped into another atmospheric river-type storm as it crashed into southern Oregon, then Northern California. 

SEE SOME OF THE MOST CATASTROPHIC ATMOSPHERIC RIVERS AND FLOODING IN CALIFORNIA HISTORY

The Sacramento River would jump from about 2-3 feet deep to 20 feet deep and set the first of four all-time records that winter.

HOW FLOODWATER CAN MAKE YOU VERY SICK

“These sustained and multiple, building river level peaks are rare and are testimony to the consistent magnitude of the series of storms,” Schick said.

As the end of December neared, the storm track shifted to the south, now aiming one juicy storm after another at California, while the Pacific Northwest went into an eventual deep freeze.

Storms would keep smashing into California for the next 7-8 weeks. Schick estimated that six of the storms would be categorized as at least “exceptional” atmospheric river storms.

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“Measurements on the Sacramento River indicate the first and most substantial rise in December peaking about Dec. 12,” Schick said. “The river did not recede much after that. Subsequent storms pushed it up to several more, even higher peaks into mid-January 1862. The flooding just wouldn’t quit.”

THESE ARE THE RAINIEST HOUR AND MINUTE IN AMERICAN HISTORY

Widespread flooding swamped large stretches of Central California’s valleys. In one stretch of valley that measured about 30 miles wide and 250 miles long, water depths ranged from a few inches to 30 feet in some areas. Telegraph poles were underwater.

“It’s documented that Leland Stanford, newly elected governor of California, was rowed to his inauguration in flooded downtown Sacramento during the floods,” Schick said. “Many wanted to move the capital from Sacramento to San Francisco because of the flooding. Damages to California included losing 25% of its tax base. The state teetered with bankruptcy.”

Southern California’s turn to feel the historic wrath of the atmospheric rivers

Southern California wasn’t spared as the relentless storm track moved south into the region in January 1862. The Santa Ana River in Southern California measured water flow on Jan. 22 at 318,000 cubic feet per second – about half the flow of the Mississippi River despite being a tiny fraction of its size.

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Floodwaters stretched across the Los Angeles Basin and parts of Orange County, south into San Diego.  Where Disneyland sits today would have been flooded under 2-4 feet of water for 3-6 weeks, according to Schick.

WHY CALIFORNIA IS PRIMED FOR LANDSLIDES

“Poor little Snow White would have been doing the backstroke to get to Tomorrowland,” he said.

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Pacific Northwest goes into deep freeze

Finally, some of the cold air that had been freezing the Pacific Northwest sinks down and shuts off the storm track. But not before leaving its icy mark across that region.  

The Seattle area would drop below 0 degrees, while the temp dropped to -29 degrees in Walla Walla and just 23 degrees in San Francisco. The Columbia, Willamette and Fraser rivers all froze solid. 

The final tallies 

It was the incredible amounts of water that fell from the sky that would leave the greatest mark.

Eight major rivers in the West still have the 1862 floods as their high-water marks: The Willamette, Rogue and Klamath rivers in Oregon, and the Stanislaus, American, Tuolomne, Salinas and Santa Ana rivers in California. Schick pointed out that the large floods of 1964 and 1996 on the Willamette may have reached those lofty levels if not for more modern-day flood control efforts. 

“Proves dams and reservoirs can help,” Schick said.

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7 FACTS YOU SHOULD KNOW ABOUT FLASH FLOODS

The Salinas River caused major flooding earlier this year with the train of atmospheric rivers and reached a peak flood of 27 feet. In 1862, the river reached 32 feet.

In addition, the Colorado River’s largest flow measurement is also from 1862 at an incredible 400,000 cubic feet per second due to massive snowmelt later in the spring.

The 50-day rainfall in San Francisco during last winter’s relentless storms peaked at 20.49 inches, according to John Christy, Ph.D., with the University of Alabama. It’s a mere 63% of the 32.43 inches that fell during the 1861-62 storms.

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70 feet of snow in the Sierra?

Schick estimated that as impressive as the snowpack was in the Sierras this past winter, it was likely 10-20% more in the winter of 1861-62. California’s Mammoth Mountain had 715 inches of seasonal snowfall in 2022-23, but Schick estimates snowfall reached around 840 inches in 1862. Some 16 feet of snow fell in the Holcomb Valley on the eastern slopes of the San Bernardino Mountains in 1862.

THE SOUND OF SILENCE: WHY IT’S QUIETER AFTER A SNOWSTORM

Schick said to put that winter in perspective, take the flooding storms of this past year, then add in the major flooding storms in Northern California in 1964, 1986 and 1997 plus the major Southern California rainstorms of 1938 and 1969, and then you’ll see rivers approach or exceed those all-time records.

About 4,000 people died in the floods, and the damage cost in today’s dollars is around an estimated $3 billion, according to NOAA.

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“We must prepare, but nothing will stop a repeat of 1861-62 … or something even worse,” Schick said. “Most disturbing is that climate models suggest stronger atmospheric rivers in the future.”

WHAT DOES THE TERM ‘100-YEAR FLOOD’ ACTUALLY MEAN?

Climatologists estimate a storm of the magnitude of 1861-62 would occur about every 200 years. Schick said his recent research using paleo sediment profiles indicated another series of atmospheric rivers that hit the area in the early 1600s may have even been much worse than 1862.

“So, understanding, modeling, and preparing for repeat is really important,” Schick said. 



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Neil Thwaites promoted to ‘Vice President of Global Sales & California Commercial Performance’ for Alaska Airlines and Hawaiian Airlines – Alaska Airlines, Hawaiian Airlines and Horizon Air

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Neil Thwaites promoted to ‘Vice President of Global Sales & California Commercial Performance’ for Alaska Airlines and Hawaiian Airlines – Alaska Airlines, Hawaiian Airlines and Horizon Air


Thwaites will lead the strategy and execution of all sales activities for the combined Alaska Airlines and Hawaiian Airlines team. His responsibilities include growing indirect revenue on Alaska’s expanding international and domestic network, as well as expanding Atmos for Business, a new program designed for small- and medium-sized companies.

Thwaites joined Alaska Airlines in January 2022 as regional vice president in California. Since stepping into the role, Thwaites has significantly sharpened the airline’s focus and scale in key markets and communities across the state, strengthening Alaska’s position as we continue to grow in California. He will continue to be based at the company’s California offices in Burlingame. The moves take effect Dec. 13, with Thwaites also continuing to lead his current California commercial planning and performance function in addition to Global Sales.

Prior to Alaska, Thwaites worked in multiple positions within the airline industry, including a decade holding roles in London, New York, and Los Angeles for British Airways (a fellow oneworld member); most recently as ‘VP, Sales – Western USA’, where he was responsible for market development strategy and indirect revenue for both British Airways and Iberia across the western U.S.

Thwaites is originally from the United Kingdom and graduated from the University of Brighton with a double honors degree in Business Administration & Law.

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Tiny tracker following monarch butterflies during California migration

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Tiny tracker following monarch butterflies during California migration


SAN FRANCISCO (KGO) — When this monarch butterfly hits the sky it won’t be traveling alone. In fact, an energetic team of researchers will be following along with a revolutionary technology that’s already unlocking secrets that could help the entire species survive.

“I’ve described this technology as a spaceship compared to the wheel, like using a using a spaceship compared to the invention of the wheel. It’s teaching us so, so much more,” says Ray Moranz, Ph.D., a pollinator conservation specialist with the Xerces Society.

Moranz is part of a team that’s been placing tiny tracking devices on migrating monarchs. The collaboration is known as Project Monarch Science. It leverages solar powered radio tags that are so light they don’t affect the butterfly’s ability to fly. And they’re allowing researchers to track the Monarch’s movements in precise detail. With some 400 tags in place, the group already been able to get a nearly real time picture of monarch migrations east of the Rockies, with some populations experiencing dramatic twists and turns before making to wintering grounds in Mexico.

“They’re trying to go southward to Mexico. They can’t fight the winds. Instead, some of them were letting themselves be carried 50 miles north, 100 miles north, 200 miles the wrong way, which we are all extremely alarmed by and for good reason. Some of these monarchs, their migration was delayed by two or three weeks.

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According to estimates, migrating monarch populations have dropped by roughly 80% or more across the country. And the situation with coastal species here in California is especially dire. Blake Barbaree is a senior scientist with Point Blue Conservation Science. He and his colleagues are tracking Northern California populations now clustered around Santa Cruz.

MORE: Monarch butterflies to be listed as a threatened species in US

“This year, there’s it’s one of the lowest, populations recorded in the winter. And the core zones have been in Santa Cruz County and up in Marin County. So we’ve undertaken an effort to understand how the monarchs are really using these different groves around Santa Cruz by tagging some in the state parks around town,” Barbaree explains.

He says being able to track individual monarchs could help identify microhabitats in the area that help them survive, ranging from backyard pollinator gardens to protected open space to forest groves.

“So we’re really getting a great insight to how reliant they are on these big trees, but also the surrounding area and people’s even backyards. And then along the way around the coast, how they’re transitioning among some of these groves. And we’re looking for some of the triggers for those movements. Right. Why are they doing this and what’s what’s driving them to do that? So those questions are still a little bit further out as we get to analyze some more some more of the data,” he believes.

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And that data is getting even more precise. The tags, developed by Cellular Tracking Technologies, can be monitored from dedicated listening stations. But the company is also able to crowdsource signals detected by cellphone networks on phones with Bluetooth connectivity and location access activated. And they’ve also helped develop an app that allows volunteers, citizen scientists, and the general public to track and report Monarch locations themselves using their smartphones.

CEO Michael Lanzone says the initial response has been overwhelming.

MORE: New butterflies introduced in SF’s Presidio after species went extinct in 1940s

“We were super surprised to see 3,000 people download the monarch app. It’s like, you know, but people really love monarchs. There’s something that people just relate to,” says Lanzone who like many staffers at Cellular Tracking Technologies, has a background in wildlife ecology.

A number of groups are pushing to have the monarchs designated nationally as a threatened species. If that ultimately happens, researchers believe the tracking data could help put better protections in place.

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“They’re highly vulnerable to, you know, some of the different things that that that we as humans do around using pesticides and also potentially cutting, you know, cutting down trees for various reasons. Sometimes they’re for safety and sometimes it’s, you know, for development. But so having an understanding of how we can do those things more sensibly and protect the places that they need the most,” says Point Blue’s Barbaree.

And it’s happening with the help of researchers, citizen scientists, and a technology weighing no more than a few grains of rice.

The smartphone app is called Project Monarch Science. You can download it for free and begin tracking.

Copyright © 2025 KGO-TV. All Rights Reserved.



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Poisonings from ‘death cap’ mushrooms in California prompt warning against foraging

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Poisonings from ‘death cap’ mushrooms in California prompt warning against foraging


After a string of poisonings from “death cap” mushrooms — one of them fatal — California health officials are urging residents not to eat any foraged mushrooms unless they are trained experts.

Doctors in the San Francisco Bay Area have blamed the wild mushroom, also called Amanita phalloides, for 23 poisoning cases reported to the California Poison Control System since Nov. 18, according to Dr. Craig Smollin, medical director for the system’s San Francisco division.

“All of these patients were involved with independently foraging the mushrooms from the wild,” Smollin, who is a professor of emergency medicine at the University of California, San Francisco, said at a news conference Tuesday. “They all developed symptoms within the first 24 hours, including nausea, vomiting, diarrhea and abdominal pain.”

Smollin said some of the patients were parts of cohorts that had consumed the same batch of foraged mushrooms. The largest group was about seven people, he said.

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All of the patients were hospitalized, at least briefly. One died. Five remain in hospital care. One has received a liver transplant, and another is on a donation list awaiting a transplant, Smollin said. The patients are 1½ to 56 years old.

Mushroom collectors said death cap mushrooms are more prevalent in parts of California this season than in years past, which could be driving the increase in poisonings.

“Any mushroom has years that it’s prolific and years that it is not. … It’s having a very good season,” said Mike McCurdy, president of the Mycological Society of San Francisco. He added that the death cap was one of the top two species he identified during an organized group hunt for fungi last week, called a foray.

In a news release, Dr. Erica Pan, California’s state public health officer, warned that “because the death cap can easily be mistaken for edible safe mushrooms, we advise the public not to forage for wild mushrooms at all during this high-risk season.”

Dr. Cyrus Rangan, a pediatrician and medical toxicologist with the California Poison Control System, said the “blanket warning” is needed because most people do not have the expertise to identify which mushrooms are safe to eat.

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Still, he said, “it’s rare to see a case series like this.”

The California Poison Control System said in a news release that some of the affected patients speak Spanish and might be relying on foraging practices honed outside the United States. Death cap mushrooms look similar to other species in the Amanita genus that are commonly eaten in Central American countries, according to Heather Hallen-Adams, the toxicology chair of the North American Mycological Association. Because death caps are not often found in that region, foragers might not realize the potential risk of lookalikes in California, she said.

Anne Pringle, a professor of mycology at the University of Wisconsin-Madison, said there is a litany of poisoning cases in which people misidentify something because their experience is not relevant to a new region: “That’s a story that comes up over and over again.”

An Amanita phalloides mushroom in Hungary. The species originated in Europe and is invasive in the U.S. Anne Pringle

Over the past 10 years, mushroom foraging has boomed in the Bay Area and other parts of the country. At the same time, information resources about mushroom toxicity — reliable and otherwise — have proliferated, as well, including on social media, phone apps and artificial intelligence platforms. Experts said those sources should be viewed with skepticism.

Longtime mushroom hunters maintain that the practice can be done safely. McCurdy, who has collected and identified mushrooms since the 1970s, said he bristled at the broad discouragement of foraging.

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“No, that’s ridiculous. … After an incident like this, their first instinct is to say don’t forage,” he said. “Experienced mushroom collectors won’t pay any attention to that.”

But McCurdy suggested that people seek expertise from local mycological societies, which are common in California, and think critically about the sources of information their lives may be relying on.

Pringle and McCurdy both said they have seen phone apps and social media forums misidentify mushrooms.

“I have seen AI-generated guidebooks that are dangerous,” Pringle said.

The death cap is an invasive species that originated in Europe and came to California in the 1930s, most likely with imported nursery trees. The mushroom is usually a few inches tall with white gills, a pale yellow or green cap and often a ring around the base of its stalk.

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The species is found across the West Coast and the Eastern Seaboard, as well as in Florida and Texas, according to Hallen-Adams, who is also an associate professor of food science at the University of Nebraska-Lincoln.

In California, it typically grows near oak trees, though occasionally pines, too. The mushroom’s body is typically connected to tree roots and grows in a symbiotic relationship with them.

The toxin in death cap mushrooms, called amatoxin, can damage the kidneys, liver and gastrointestinal tract if it is ingested. It disrupts the transcription of genetic code and the production of proteins, which can lead to cell death.

Hallen-Adams said the U.S. Poison Centers average about 52 calls involving amatoxin each year, but “a lot of things don’t get called into poison centers — take that with a grain of salt.”

Amatoxin poisoning is not the most common type from mushrooms, but it is the most dangerous, she added: “90% of lethal poisonings worldwide are going to be amatoxin.”

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It takes remarkably little to sicken a person.

“One cubic centimeter of a mushroom ingested could be a fatal dose,” Hallen-Adams said.

Symptoms of amatoxin poisoning often develop within several hours, then improve before they worsen. There is no standard set of medical interventions that doctors rely on.

“It’s a very difficult mushroom to test for,” Rangan said, and “also very difficult to treat.”

One drug that doctors have leaned on to treat some of the California patients — called silibinin — is still experimental and difficult to obtain.

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“All of our silibinin comes from Europe,” Hallen-Adams said.

Death cap mushrooms have continued to grow abundantly since their introduction, and Pringle’s research has shown that the species can reproduce bisexually and unisexually — with a mate or by itself, alone — which gives it an evolutionary advantage.

“If Eve can make more of herself, she doesn’t need Adam,” Pringle said. “One of the things I’m really interested in is how you might stop the invasion, how you might cure a habitat of its death caps. And I have no solutions to offer you at the moment.”



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