A monumental flight over Mojave Trails

Mojave Desert Land Trust aerial tour shows splendor of national monument whose status could be reassessed

Amboy Crater is a significant geological feature of the Mojave Trails National Monument. Last week, the Mojave Desert Land Trust hosted an aerial tour as part of the third anniversary of the monument. [James Quigg, Daily Press]

By Matthew Cabe
Victor Valley Daily News

PALM SPRINGS — Storm clouds hovered over the city and patches of rain fell from above the nearby San Jacinto Mountains, but two Mojave Desert Land Trust officials arrived at the international airport here last week ready for a celebration.

Staff at the Joshua Tree-based nonprofit recently completed plans to commemorate the upcoming third anniversary of Mojave Trails, Sand to Snow and Castle Mountains national monuments.

All three were established Feb. 12, 2016, by former President Barack Obama through use of the Antiquities Act. Combined, they encompass nearly 1.8 million acres in the Mojave, Colorado and Sonoran deserts.

To offer a comprehensive view, MDLT partnered with the nonprofit EcoFlight for a series of flyovers within the Mojave Trails National Monument, which boasts 1.6 million acres and is the largest national monument in the 48 contiguous states, according to MDLT Communications Director Jessica Dacey.

Shortly before 10 a.m. Tuesday, Dacey and MDLT Education Coordinator Adam Henne briefed a group of passengers that included a Daily Press reporter and photographer.

“You get a bit of a buzz when you go up there,” Dacey said. “Especially coming from this angle ... you start to understand the seamlessness between the parks.”

Tuesday’s flight traveled first above Joshua Tree National Park, then over Sheep Hole Pass, which served as the Cessna 210′s entrance into Mojave Trails.

For Dacey and others, part of the monument’s importance is its function as a wildlife corridor connecting the national park and the Mojave National Preserve, the more than 1.5-million-acre swath of National Park Service land between interstates 15 and 40.

Within the monument, the Cady Mountains serve as one of the best areas in the Mojave Desert to see bighorn sheep, according to MDLT.

The North American population of the muscular animal with curved horns was once estimated in the millions. By 1900, human encroachment diminished bighorn sheep numbers to several thousand, National Wildlife Federation statistics show. Conservation efforts have since brought those numbers up to nearly 8,000.

Bonanza Spring, located near the monument’s northern border, is the only wetland for 1,000 square miles. Like the Cady Mountains, the spring is also home to bighorns and 70 bird species.

Dacey said the habitat connectivity created with the monument’s establishment allows many animals to roam, helps increase their populations and protects plant life they need to survive.

There are also unique historical and cultural aspects to the monument’s significance, she said.

Mojave Trails is home to the longest undeveloped section of U.S. Route 66. Preservation of the “Mother Road,” according to the World Monuments Fund, would equal positive economic effects like “sustainable tourism.”

The monument also includes some of the best-preserved sites from the World War II-era Desert Training Center where, under the command of Gen. George S. Patton, more than a million troops were trained on 18,000 square miles for desert combat in North Africa.

Deep within the vast expanse visible through the Cessna’s starboard-side windows, another geographical feature appeared, albeit inconspicuously from 2,500 feet above the desert floor.

The Cadiz Dunes Wilderness spans nearly 20,000 acres in the heart of the monument. The dunes appear to “hum in the wind,” Dacey told passengers.

“I think they’re more majestic than the Kelso Dunes in the Preserve,” she said.

Bruce Gordon, who piloted the Cessna, nodded in agreement from behind his aviators. Gordon founded EcoFlight in 2002 to advocate for environmental protection via programs and aerial visuals that expand public awareness of wild lands.

He couldn’t help but take his hands off the Cessna’s yoke to capture photographs of the pristine topography below. He used the 80-minute flight to share his own knowledge of the region.

Several concerns were noted, as well.

One, MDLT contends, is Cadiz Inc.’s planned water project, which would pull 50,000-acre-feet of water a year from an ancient aquifer beneath the Mojave Desert. The water would later be sold in Southern California.

Cadiz owns roughly 34,000 acres within Mojave Trails, Dacey said. Company officials have said the pumping would not harm the environment. Rather, the project would conserve surplus water lost to evaporation at nearby dry lakes.

Cadiz’s research maintains that Bonanza Spring would not be impacted by pumping. Other research published in 2018 called the company’s findings into question and said the project would threaten Bonanza Spring, according to MDLT, which funded some of the research.

Cadiz CEO and President Scott Slater has stated the company is confident of no interconnection between groundwater and water levels in Bonanza Spring, the company’s website shows.

MDLT officials say the project could harm the bighorns that use Bonanza Spring. Dacey said a pipeline for the project has not yet been constructed.

Gordon navigated the plane toward Amboy Crater, situated about three miles southwest of Roy’s Motel and Cafe. At 80,000 years old, Amboy is “North America’s youngest volcano,” Dacey said.

MDLT is one of several environmental groups working to secure Mojave Trails’ status, which Dacey said is “in limbo.”

In April 2017, President Donald Trump issued an executive order directing Interior Department Secretary Ryan Zinke — who resigned his post last month — to review national monuments of at least 100,000 acres that have been designated since 1996.

Trump’s goal was to determine whether the monuments needed reduction or elimination. Mojave Trails was subsequently included for review. Trump called the monuments, particularly Bear Ears National Monument in Utah, a “massive federal land grab.”

An initial report released in December 2017 included changes to 10 monuments. That same month, Trump signed proclamations that scaled back Bear Ears, as well as Grand Staircase-Escalante National Monument. In doing so, he declared, “Public lands will once again be for public use.”

Mojave Trails has not been altered, but Dacey said it’s never officially been declared safe.

When the monument was established, a management plan had to be drawn up by this month. That process was halted amid the Interior Department’s review. MDLT is part of a coalition working on a community proposal for a management plan. Dacey said the expectation is for it to guide future planning for Mojave Trails.

In 2016, visitors to Joshua Tree National Park more than doubled to over 2.5 million, prompting Park Superintendent David Smith to declare it was being “loved to death.” Dacey said attendance now is well over 3 million per year.

Amid the rise in popularity, as well as a massive clean-up effort underway in the damaged park following the partial federal government shutdown, groups are hoping to increase awareness of places like Mojave Trails as alternative destinations.

The question MDLT wants people to ask is, “What do these other public lands have to offer?” Dacey said.

From overhead, the answer seems simple enough.

Rare desert spring imperiled by company's plan to pump groundwater

Bonanza Spring nourishes an oasis of plants and trees in the Mojave Desert. (Photo: Jay Calderon/The Desert Sun)

Ian James
The Desert Sun

Below the rocky, sunbaked ridges of the Clipper Mountains in the Mojave Desert, a ribbon of green teems with life.

Cottonwoods, willows and reeds sway with the breeze. Crickets chirp. Bees buzz around shallow pools.

Clear water gushes from a hole in the ground, forming Bonanza Spring, the largest spring in the southeastern Mojave Desert.

This rare oasis is at the center of the fight over a company’s plan to pump groundwater and sell it to California cities.

Cadiz Inc. is proposing to pump an average of 16.3 billion gallons of water each year for 50 years. The company says the project won’t harm any of the springs in the area, and it recently presented a study in which researchers concluded Bonanza Spring wouldn’t be affected by its groundwater pumping.

Now other researchers have come to the opposite conclusion, saying in a new study that Bonanza Spring is likely connected to the same aquifer where the company plans to draw water from wells, and that the project would put the spring at risk of drying up.

Andy Zdon, a hydrogeologist who led the study, analyzed water samples from the spring and determined that unlike other nearby springs, which are fed by rainfall that collects in relatively shallow underground sources, Bonanza Spring flows with water that comes from much deeper underground.

Zdon said the research points to a “hydraulic connection” between the spring and the aquifer that Cadiz intends to use, indicating the spring would probably be affected by the decline in the water table.

“The spring is going to be highly susceptible to drawdown from the pumping,” Zdon said. “It would likely dry up.”

The study, which was published Friday in the journal Environmental Forensics, involved a chemical analysis of water from Bonanza Spring and other springs in Mojave Trails National Monument. The research was conducted by consulting firm Partner Engineering and Science Inc. and funded by the Mojave Desert Land Trust, a nonprofit conservation group that opposes the Cadiz project.

Zdon and his team analyzed the oxygen and hydrogen isotopes in the water and said the water in Bonanza Spring has different characteristics than several other springs in this part of the desert. The stable isotopes in rainwater vary with latitude and elevation, and Zdon and his colleagues used those “signatures” to examine the sources of the spring water.

They determined that Hummingbird, Teresa, and Chuckwalla Springs are “perched” springs, which are relatively shallow and fed by local rainfall percolating into the ground, but that the water in Bonanza Spring differs from local rainfall and instead matches rain that falls well north of the Clipper Mountains in other mountains in the Mojave National Preserve.

The scientists also found that unlike other springs, the water in Bonanza Spring has similar characteristics to groundwater in the aquifer in the adjacent Fenner Valley — including the Fenner Gap, an area where Cadiz plans to pump groundwater.

Zdon coauthored the research with hydrogeologists M. Lee Davisson and Adam H. Love. They said in the study that Bonanza Spring “has generally been assumed to be a perched spring disconnected from the basin-fill aquifer system,” but that their results indicate it’s likely connected with that larger reserve of groundwater.

And if groundwater levels decline due to pumping, the researchers wrote, that “could result in an uncertain, but potentially substantial decrease in free-flowing water from the spring.”

Cadiz disputed the findings, and scientists who recently studied the spring for the company called the new research flawed.

“Zdon does not account for the existence of two observable geologic faults that fully insulate the Bonanza Spring from any impact from the Cadiz Water Project,” Cadiz President and CEO Scott Slater said in a statement.

In the earlier study commissioned by the Los Angeles-based company, researchers identified two faults that they said block groundwater flowing in fractured bedrock. They said those two “bounding faults” intersect at the spring, and groundwater spills over the faults to form the spring.

The study, which was released in January, was conducted by geologist Miles Kenney and hydrogeologist Terry Foreman, who said the effects of groundwater drawdown around the company’s wells wouldn’t reach the area of the spring due to a “hydraulic disconnect” and faults between the two areas.

The wellfield where the company intends to pump groundwater is located about 1,000 feet lower in elevation than the spring, and about 11 miles away.

In their assessment, Kenney and Foreman wrote that “the spring’s discharge is localized within a fractured rock system that is hydraulically separated from the alluvial regional groundwater system in Fenner Valley located three miles to the east.” They said their research “demonstrates that the perennial spring discharge is controlled by the existence of two bounding faults.”

As part of the research, Kenney mapped the faults and the geology around the spring. During six days of field work, Kenney inspected a tunnel uphill from the spring on the mountainside that was apparently excavated in the early 1900s by miners, and he found a portion of the fault exposed in the wall of the passage. The other intersecting fault zone was also visible.

“Essentially those faults act like dams,” Foreman said. “It’s effectively a subsurface dam that then causes the water to overspill, groundwater to spill over those faults.”

The researchers who prepared the study for Cadiz said the spring’s flow depends on recharge from precipitation in a catchment area that extends over four miles to the north.

“The spring is going to be controlled absolutely by climatic conditions, basically changes in long-term rainfall and recharge above where those faults occur,” Foreman said. “It’s going to be driven by that recharge as opposed to anything that happens in the valley.”

Kenney criticized Zdon’s research, saying “he basically didn’t look at the local geology.”

“We think it’s flawed and it needs to be corrected,” Foreman added.

Arguing over the science

Zdon said he disagreed with the conclusions of the study commissioned by Cadiz. He pointed out that Kenney and Foreman didn’t include a similar analysis of water samples.

“You can’t begin to source where water comes from without looking at the water itself, and they did not do that,” Zdon said.

Zdon previously conducted a survey of more than 300 springs and water holes across the Mojave Desert for the federal Bureau of Land Management during 2015 and 2016. He’s found that most of the springs in the desert rely on local precipitation and may increase or decrease in flow depending on whether it’s been wet or dry.

But Zdon said records from more than a century ago show that Bonanza Spring is different and that its flow has held steady at about 10 gallons a minute. It’s still putting out as much water as it did in the early 1900s, he said, when a pipeline carried water downhill to the railway stop in Danby to fill tanks aboard passing steam engines.

Zdon said other measurements provided additional clues. When a spring depends on shallow groundwater, the water temperature is usually close to the average annual air temperature. But the water in Bonanza Spring emerges from the ground more than 11 degrees warmer, indicating it’s warmed up by the earth deep underground. His team calculated the water must be coming up from more than 750 feet underground.

Zdon also analyzed the water to check for tritium, a radioactive isotope of hydrogen that was released into the atmosphere with nuclear weapons testing starting in the late 1940s. The water in nearby Teresa Spring contains tritium, showing the water fell as rain or snow sometime between the 40s and the present day. But the water in Bonanza Spring contains no tritium, indicating it’s been underground since before those atomic tests.

Zdon said other carbon-dating tests, which weren’t described in their study, have found that the water coming out of Bonanza Spring has been underground for approximately 15,000 years.

“So, between the groundwater ages, the temperatures and the chemistry, looking at it from three different directions, it’s all pointing to the same answer: that this is tied into more regional flow,” Zdon said. “That water has got to be moving towards the Clipper Mountains through the basin-fill aquifer… and seeping through the Clipper Mountains, probably along fractured rocks along the fault zones, and surfacing at the spring.”

On that point, too, the scientists who prepared the report for Cadiz said they disagree based on their observations and their work mapping the faults and reviewing scientific papers. They also studied documents concerning two old mines located about a mile northeast of the spring.

The groundwater levels in those inactive mines are about 150 feet lower than the elevation where water flows from Bonanza Spring, they wrote, suggesting that the faults in the area, which run from the northwest toward the southeast, act as barriers and “groundwater flow is effectively compartmentalized.”

“It’s physically impossible for groundwater to move from the north, across that area where those mines are, to Bonanza Spring,” Foreman said. “Groundwater levels to the north of Bonanza Spring are lower, so there’s no way that groundwater levels can go from a high to a low and then essentially go back uphill. It’s just physically not possible.”

Kenney also reviewed aerial images in mapping the faults and the geology. Cadiz’s research team said they found other geologic signs including an abundance of precipitated minerals along the fault zones, “indicating that the faults can be strong groundwater barriers.”

As part of the study commissioned by Cadiz, 10 hydrologists and geologists visited the spring in December with Foreman and Kenney, and five of them reviewed the report and agreed with the conclusion that the spring wouldn’t be affected by the water project.

Cadiz has proposed to pump groundwater on land surrounded by Mojave Trails National Monument. The company owns 34,000 acres in the desert along Route 66, and it plans to build a 43-mile pipeline to carry water from its property to the Colorado River Aqueduct.

In 2011 and 2012, Cadiz’s proposal went through an environmental review under the California Environmental Quality Act. Orange County’s Santa Margarita Water District served as the lead agency in the review process and certified the environmental impact report. The document repeatedly states that “the physical evidence indicates” the aquifer isn’t connected to the springs and therefore the pumping would have no impact on the springs.

Conservation groups challenged the environmental review in court, but they lost.

Frazier Haney, land conservation director for the Mojave Desert Land Trust, said the new research shows those environmental review documents were based on incomplete science and that the water project poses a serious threat to the spring.

During a visit to Bonanza Spring, Haney walked past blooming brittlebush shrubs and wildflowers to the edge of the spring, where the thick vegetation rustled in the breeze. He said he’s seen mountain lion tracks here. The spring is also frequented by bighorn sheep and bobcats that come to drink, and by migratory birds that forage among the trees.

Frogs and tadpoles swim in the ponds, and dozens of species of native plants grow in the wetland, which stretches a half-mile downhill from the spot where water pours out of the ground.

Walking to the top of a bluff, Haney looked out over the springs.

“It’s a magical place,” Haney said. “Springs like this are one of the most important parts of the ecosystem.”

From the ridges above the spring, you can see the open desert of the Fenner Valley below. It stretches out in a plain between mountain ranges, covered with creosote bushes. Haney pointed out the patch of the desert where Cadiz is proposing to drill new wells.

“Intensive groundwater pumping out here could be devastating for the ecosystem,” Haney said.

His group focuses on buying lands to protect parts of the desert for conservation. It has purchased more than 71,000 acres for conservation since 2006. Some of those lands have been transferred to the federal government and have become part of the Mojave Trails National Monument.

Cadiz’s managers have said they plan to use groundwater that would otherwise gradually flow downhill and evaporate from two dry lakes. On those dry lakebeds, other companies dig trenches in the cracked soil to extract salts left by the evaporating water.

The concept of using water that would otherwise evaporate from the lakebeds is reflected in the company’s formal name for its plan: the Cadiz Valley Water Conservation, Recovery and Storage Project.

“The Cadiz Water Project will stop the annual loss of more than 10 billion gallons per year to evaporation,” Courtney Degener, a vice president and spokesperson for the company, said in an email. “It cannot and will not impact area springs but it will make available new water for 400,000 people, create critical groundwater storage capacity for our region and support 5,900 new jobs in a safe and sustainable way.”

Degener said Zdon’s new study “fails to account for the most current field work and hydrogeological conclusions about area springs, and does not present any new credible findings.”

‘Cone of depression’

Cadiz’s proposal has been hotly debated for years. While pursuing the plan to sell water, the company has been pumping groundwater on its property to irrigate nearly 2,000 acres of farmland, growing lemons, grapes, raisins and other crops.

During President Barack Obama’s administration, federal officials had hindered the project by ruling that the company would need a new permit to build a water pipeline alongside a railroad.

But in October, President Donald Trump’s administration reversed that decision and gave the company a green light. The federal Bureau of Land Management told Cadiz it wouldn’t need a permit to build the pipeline along the railroad right-of-way.

Two environmental groups — the Center for Biological Diversity and the Center for Food Safety — are challenging that decision in a lawsuit. Another group, the National Parks Conservation Association, is suing to challenge a related policy change: a 2017 Interior Department legal opinion that said railroad companies are allowed to lease out portions of their rights-of-way for other purposes without going through a federal environmental review.

Cadiz has said it plans to move ahead with designing and building the water pipeline alongside the railroad.

That plan still could face obstacles, though, because some of the land where Cadiz wants to build the pipeline is owned by the state. And in September, California’s State Lands Commission told the company that any use of the state-owned lands under its jurisdiction would require a lease and its approval.

Opponents of the project seized on the new study, saying it reveals problems in the 2012 environmental review.

“Given this new information, I strongly believe Cadiz’s CEQA review must be reexamined,” Sen. Dianne Feinstein said in a statement Friday. “Cadiz needs to accept this new scientific study and abandon its goal of draining the Mojave Desert of its most precious resource: water. It’s time Cadiz and its investors give up on this desert boondoggle.”

Chris Clarke, California desert program manager for the National Parks Conservation Association, agreed and said the new research “demonstrates Cadiz has used a flawed hydrology model that produced flawed analysis” for the environmental review. He said that process “now must be corrected through additional environmental review.”

The company’s officials have defended the environmental review, pointing out that California’s environmental law is considered more stringent than any federal environmental law and that San Bernardino County in 2012 approved a groundwater management plan — formally titled the Groundwater Management, Monitoring and Mitigation Plan — which sets additional limits for the project.

Cadiz also points to the court decisions upholding the review.

“Peer-reviewed science, physical observations of the region and California’s courts all agree: The Cadiz Water Project will protect the desert environment including Bonanza Spring,” Degener said.

The groundwater management plan details the county’s oversight role for the project.

“It is not anticipated that the Project will have any impact on the springs,” the document says. “Nonetheless, this Management Plan provides for quarterly monitoring of the Bonanza Spring as an ‘indicator spring’ because it is the spring that is in closest proximity to the Project wellfield.”

The plan calls for “baseline and periodic visual observation and flow estimates” and says monitoring wells between the wellfield and the spring would be used to track groundwater levels.

According to the plan, if there’s a reduction in the spring’s flow and it’s determined to be due to the company’s wells, “corrective measures” would include reducing pumping, changing pumping locations in the wellfield or stopping groundwater extraction.

More: Federal policy change criticized for giving ‘free pass’ to controversial desert water project

One of the concerns that Zdon and others raise about Cadiz’s plan is that the pumping would create a “cone of depression” in the aquifer as groundwater flows from surrounding areas toward the company’s wellfield.

The way groundwater drawdown occurs in the desert, Zdon said, “it’s very hard to control what happens once that cone of depression starts building.”

Once the pumping begins to lower the water table, that depressed area of the aquifer would continue to expand for years, even if the pumping were stopped.

Given that dynamic, Zdon said, the monitoring plan “is not sufficient to be protective of the spring.”

“When you lower the water table below a spring system like that, the first thing you would notice is a reduction in surface flow and maybe a complete cessation of any kind of surface water at the site,” Zdon said. “If you see an impact at the spring, it’s probably too late.”

Cadiz’s executives and researchers responded that the sort of monitoring Zdon is calling for is already part of the county’s plan.

Degener said the project “will be regulated by an extensive groundwater monitoring plan enforced by the County that includes the exact kind of groundwater monitoring Zdon recommends and goes even further including monitoring features across the entire watershed.”

There are already two existing monitoring wells, one uphill from Fenner Valley and another close to Danby, Foreman said.

“It’s interesting that the water temperature in those wells is actually higher than the water temperature of the spring,” Foreman said. “And so that water has obviously moved over long distances and it’s 2 to 3 degrees higher in temperature than the spring, so we think that the spring is more local water, and those water temperatures show that separation.”

Kenney and Foreman said some of Zdon’s findings are consistent with their own but they disagree with the conclusions, including that the spring would be fed by recharge from an area far to the north.

“I’m wondering how much of his findings might change if he was to consider the watershed that we considered, not north of the Clippers but just simply the rocks in the western Clipper Mountains,” Kenney said.

Zdon and his colleagues stressed that if the pumping begins, more intensive monitoring would be necessary to protect the spring. They wrote that the groundwater monitoring “should be designed to obtain sufficient early warning of potentially damaging groundwater level decline.”

They said relying on observable changes at the spring would be ineffective, and that drilling monitoring wells close to Bonanza Spring would provide a way of spotting a decline quickly — before it’s too late for the spring.

Their research included not only data collected by Zdon and his colleagues, but also data from a study that researchers from the Lawrence Livermore National Laboratory conducted in 2000 for Cadiz and the Metropolitan Water District, which were working together at the time on an earlier iteration of the project.

That earlier research focused on identifying the recharge area and estimating the amount of recharge. It included geochemical analyses of the water in Bonanza Spring and other springs and wells.

Davisson, who was one of Zdon’s coauthors, also helped carry out that research for Lawrence Livermore back in 2000, and the data was publicly released in August 2017.

Zdon said the data helped confirm his team’s findings.

“We were actually largely using the same analytical techniques in sampling that Lawrence Livermore used back in 2000 on behalf of Cadiz,” Zdon said. “What that did was essentially confirm our sampling, because basically our results 17 years later were nearly identical with what Lawrence Livermore came up with.”

Volunteers Sought to Help Restore Bonanza Springs

News Release

BUREAU OF LAND MANAGEMENT
California Desert District

Volunteers willing to roll up their sleeves for a day are needed to help restore Bonanza Springs. As part of the 15th annual National Public Lands Day, Saturday, Nov. 8, 2008, volunteers will help eradicate tamarisk and arundo, which have endangered the spring’s vitality, as well as install a pedestrian pass-through gate, maintain and reclaim trails, and install natural stones from the wash as stepping stones.

Lunch will be provided to the first 50 registered volunteers. All volunteers will receive a free NPLD t-shirt and a pass good for one free entry, any day during the next year, at public land sites managed by the National Park Service, the U.S. Forest Service, the U.S. Fish and Wildlife Service, the BLM, or the US Army Corp of Engineers.

"Last year we reached a monumental participation of 110,000 volunteers on National Public Lands Day, and we are expecting to increase this by an additional 10,000 this year," said Robb Hampton, director of National Public Lands Day. This year, National Public Lands Day commemorates the 75th anniversary of the Civilian Conservation Corps and is sponsored for the ninth consecutive year by Toyota Motor Sales, USA.

Bonanza Springs is a small oasis 45 miles west of Needles, just north of Route 66 between Essex and Chambless, Calif. This small spring in the desert makes surrounding uplands inhabitable by wildlife for up to several miles.

Nearly a decade ago, the Bureau of Land Management (BLM) began clearing Bonanza Springs of noxious weeds, which were choking the life out of the springs. Tamarisk, often called salt cedar, is an evergreen shrub or tree growing to 50 feet in height and forming dense thickets. It can spread both by submerged stems and by seeds. Each flower can produce thousands of tiny seeds that are contained in a small capsule, usually adorned with a tuft of hair that aids in wind dispersal. Seeds can also be dispersed by water. Tamarisk species are fire-adapted and have long tap roots that allow them to intercept deep water tables and exploit natural water resources. They are able to limit competition from other plants by taking up salt from deep ground water, accumulating it in their foliage and depositing it in the surface soil. The salt build ups can be detrimental to other plants.

Arundo is a tall, perennial reed, growing in fresh and moderately saline water. It can grow to 30 feet in ideal conditions. This vegetative growth appears to be well adapted to floods, breaking up into individual clumps, spreading the pieces, then sprouting and colonizing further downstream. In 2007, BLM employees, with the help of volunteers, placed thick, black tarpaulins over the arundo to prevent light from reaching the plant, reducing its ability to photosynthesize. The lack of light eventually depletes the plants energy reserves, causing it to die back. Since the tarps have been in place for more than a year, they will be picked up and moved to other spots within the Bonanza Springs area.

To find out more about the project, including what to bring, directions, or to register as a volunteer, please contact Elaine Downing at edowning@ca.blm.gov or (760) 326-7003, or visit the website, Needles Field Office - Volunteer Program.