From Water Education Colorado (Jason Plautz):
As J.T. Shaver, a forester with the Colorado State Forest Service, strolls through the Hutchison Ranch, a legacy cattle farm in Salida, Colo., it’s what he doesn’t see that excites him most.
Last year, the trees here were so dense you couldn’t see more than 20 feet away. The 11,713-foot peak of Methodist Mountain was obscured by piñon-juniper trees. Now, the trunks are pleasantly spaced out, letting in beams of sunlight. The ground is scattered with wood chips and stumps, feeding a healthy new bed of grasses.
“This looks completely different than this time last year,” Shaver says. “I’m pleasantly surprised.”
The landscape’s evolution was the result of a weeks-long treatment organized by Shaver’s office to help this 5,800-person town prepare for wildfire. By thinning the dense thickets of trees, any fire that does reach the ranch shouldn’t burn hot and fast in the crown of the trees. Instead, it should run along the ground with less intensity, burning more naturally. “We’re mimicking the behavior of a wildfire that would have occurred prior to European settlement,” Shaver’s colleague, Josh Kuehn, explains.
Over the past decade, Chaffee County’s once sleepy population has steadily grown as people seek refuge from the busier Interstate 70 corridor. In 2017, county leaders convened a master planning process but were surprised to learn that residents’ No. 1 concern wasn’t small business sustainability or housing prices or even traffic. It was wildfire.
“We knew about the beetle kill epidemic and saw that our forests were in poor health,” says Kim Marquis, project and outreach coordinator for Envision Chaffee County. “The first step to growth planning was taking on our wildfire risk.”
At that point, Chaffee County had been spared from the intense fires ravaging the state in recent decades, although the 2019 Decker Fire would soon burn just two miles south of Salida. But residents had embraced the frightening reality that few places in Colorado are safe from fires. Climate change and the decades-long drought have been fueling bigger and more dangerous fires, leaving devastation up and down watersheds.
The county assembled stakeholders, including state foresters, federal officials, local landowners and farmers, to work proactively to improve forest health. Aurora Water also joined the talks, since a fire near Salida could potentially pollute the headwaters of the Arkansas River, one of Aurora’s primary water sources. The partners thoroughly mapped the area, highlighting the properties and forests most at risk if a fire did come through the Rio Grande and San Isabel National Forests.
While local landowners could take their own preventative measures like shoring up buildings and removing dead trees, the Colorado State Forest Service (CSFS) also received funding for a more holistic treatment. The Methodist Front Wildland Urban Interface Forest and Watershed Health Restoration Project, funded through a RESTORE Colorado Program grant, along with the U.S. Forest Service (USFS), Salida and Poncha Springs, and a county fund, will treat 478 acres of public and private land, masticating trees to thin out the crowns and encourage healthier vegetation. Eventually, with the participation of enough landowners, the fuel break will stretch five miles, creating a buffer between the forest and the ranches, townhomes and small farms in Salida.
How fires went from healthy to hazardous
The Decker Fire, which burned nearly 9,000 acres, came in an unusually calm year in the midst of a decade that has reshaped how Coloradans see fire. Since 2012, six megafires, defined by the National Interagency Fire Center as fires larger than 100,000 acres, have burned in Colorado.
Last week, the Marshall Fire in Boulder County, though just a few thousand acres in size, became the state’s most destructive, burning nearly 1,000 homes in Superior, Louisville and parts of unincorporated Boulder County.
2020 saw the state’s three largest recorded fires to date—Cameron Peak, East Troublesome and Pine Gulch—and some 700,000 acres burned, more than 540,000 of which burned in those three fires alone. And the CSFS’s 2020 Forest Action Plan projects a 50% to 200% increase in the annual area burned in the state by 2050.
There’s no single factor making Rocky Mountain fires more intense. Bark beetle infestations swept through tens of millions of acres of forest in the West over the past two decades, leaving large stands of dead trees. A century of federal policy that squelched out all fires rather than letting them burn naturally led to a buildup of fuel stores in forests. Climate change is creating warmer and drier conditions, and an earlier snowmelt has extended the fire season.
Chuck Rhoades, a research biogeochemist at the USFS’s Rocky Mountain Research Station, says those “compound disturbances” have created a pattern of fires that are burning more intensely and in places and seasons that experts wouldn’t predict. Fires that once would have been a natural tool to clear dead fuel and encourage seeds to sprout are now a major threat to communities. Some, including Cameron Peak and East Troublesome, have ravaged high-elevation forests where fires used to be rare. A 2021 study in the Proceedings of the National Academy of Sciences found that high-elevation forests in the Rocky Mountain region are burning more than at any point in the past 2,000 years.
That, Rhoades says, means land managers and cities are seeing impacts outside the scope of anything they’ve prepared for—with ripple effects throughout the environment.
“We often think that where we were before will help us predict where we’re going,” he says. “But there are a lot of question marks out there. It forces a little humility in that we can’t understand what we’re going to get next.”
One known, however, is that the higher-intensity wildfires are putting more Coloradans at risk as the state’s population booms. In 2020, the CSFS estimated that half of the state’s population lived in Colorado’s 3.2 million-acre wildland-urban interface area, known as the WUI, where human development intermingles with fire-prone vegetation. By 2050, CSFS says that area could triple in size to encompass more than 9 million acres, or more than 13% of the state.
The risks are especially profound for watersheds. As more intense fires clear out thick older trees, shrubs and grasses grow back in their place. Without dense roots and pine needle cover, the forest floor that typically acts as a sponge for snowmelt and precipitation is turning fragile and rocky. Those are prime conditions for erosion and flooding, with streams and rivers accumulating water faster and earlier than usual. According to USFS research, the risk of flooding and debris flow is higher for at least 3-5 years post-fire, often longer, and those floods can be as much as three times more severe than they would be otherwise.
Runoff from burn scars can run black, laden with ash, debris, nutrients and heavy metals from burned soil and biomass. If those contaminants reach utilities’ water infrastructure, they can clog water filters or settle in reservoirs, possibly fostering algal blooms and taking up valuable reservoir space.
The 1996 Buffalo Creek Fire and the 2002 Hayman Fire, the largest in Colorado’s history until 2020, each burned along the Upper South Platte River, immediately upstream of Strontia Springs Reservoir, which accommodates about 80% of Denver Water’s raw water supply and 90% of Aurora’s supply. The fires exacerbated erosion in the watershed, leading to sediment-laden flows that dumped debris and contaminants in the reservoir. More than a decade later, the reservoir’s capacity to store water remains reduced, and water quality is still impacted from sediment flows, even after $27.7 million worth of dredging, removal and recovery work. Last year’s fires caused water utilities across the state to shift their operations to protect their source water.
It’s clear, then, that the risks of fires no longer stay in the forest. Partnerships have sprung up from Boulder to Durango to protect valuable watersheds and water infrastructure, forcing water district managers to become just as interested in what happens to the forest around headwaters as what goes into their customers’ pipes.
All hands on deck
In 2020, the Colorado State Forest Service released its updated Forest Action Plan, identifying some 2.5 million acres—roughly 10% of the state’s forests—as being “in urgent need of treatment.” The highest priority forests were in the Front Range’s Arapaho-Roosevelt and Pike-San Isabel forests and in the San Juan Forest around Durango. “We have to prioritize those areas where we’re going to get the most bang for the buck,” says Weston Toll, watershed program specialist for the CSFS. Still, he says, with so much of the state at risk, “we’re paddling against the current.”
The Forest Action Plan’s priority map reflected a range of factors, including where fuel had built up, how close fires could get to human development, and the impact on wildlife and water. But those areas didn’t all line up with valuable headwaters, despite some water managers’ arguments that any waterways must be protected. Nor does the map give much direction on how to square the widespread needs with limited resources.
Wildfire mitigation used to be defined by what some experts call “random acts of restoration,” individual projects on small plots of land depending on the owner’s interest and availability. A National Forest might have dead trees removed and fuel treated for insect infestation, but neighboring land might be left untreated, doing little for the overall region’s safety.
Now, the USFS and others are promoting a philosophy of shared stewardship, bringing together a variety of partners ranging from federal land managers, local water districts, utilities, logging companies, recreationists and private landowners to collaborate on responsible forest management.
Toll says the state may still be paddling against the current, but “it helps to have everyone paddling in the same direction, which wasn’t happening until five or 10 years ago.”
After the runoff from the Buffalo Creek and Hayman fires poured sediment into Strontia Springs Reservoir, officials at Denver Water realized they could be spending less money and having a bigger impact by focusing on preventing fires and flooding before the effects reached their infrastructure. The utility formed the From Forests to Faucets partnership with USFS, a multi-year effort to fund forest health projects to boost resilience in priority areas within Denver Water’s collection system. In 2017, the program was expanded to include state and local authorities to stretch Denver Water’s forest health work to non-federal lands.
Fuel breaks around the Dillon Reservoir watershed funded by the program are credited with protecting nearly 1,400 homes near Silverthorne during the 2018 Buffalo Fire, despite red-flag drought conditions.
“There was this exciting realization that there were a lot of mutual benefits in funding these projects,” says Madelene McDonald, watershed planner at Denver Water. “Forest restoration projects not only bolster source water protection, but also improve wildlife habitat, expand recreation access, and can protect communities in the wildland urban interface.”
But it is also incumbent on communities to do their own preparation. That can include building codes that require fire-resistant building material or defensible space requirements to clear fuel from some established perimeter around buildings. Colorado does not have a state wildfire code or model ordinance, despite recommendations from a 2014 task force, but communities like Boulder and Colorado Springs have regulations governing new homes in at-risk areas.
“There’s a big educational component, but seeing a disaster happening right in our faces prepares people,” says Marquis of Envision Chaffee County. “We’re asking people to join this honestly heroic story to protect the community.”
Addressing all of the CSFS’ Forest Action Plan’s priority areas is estimated to cost $4.2 billion, money that state agencies and local partnerships just don’t have. USFS spent $1.8 billion in fire suppression, fighting and responding to wildfires nationally in fiscal year 2020, but just $431 million on treatments to reduce fuel buildup through its Hazardous Fuels program, according to national spokesperson Babete Anderson. According to National Interagency Fire Center data, other federal government programs spent $510 million on fire suppression in 2020. According to a Colorado Department of Public Safety report, Colorado’s 2020 fire season cost the state an estimated $38 million in suppression costs and required another $248 million in federal funds. Those state figures don’t include suppression costs footed by local agencies or the costs of property loss, infrastructure damage, watershed impacts, or economic losses. Nor do they account for other private, local, county or federal wildfire expenses.
The federal bipartisan infrastructure bill brings nearly $8 billion for wildfire risk reduction and forest restoration, including $90 million a year for the U.S. Department of Agriculture’s Landscape Restoration Partnership Initiative to support forest and grassland restoration secured by Colorado Sen. Michael Bennet.
Fire departments and forest managers can also cobble together money from grants from a variety of federal sources. In 2021, the Colorado legislature passed SB21-258, which authorized $25 million for wildfire mitigation, recovery and workforce development. In a statement, Colorado Department of Natural Resources director Dan Gibbs said the bill would “quickly move resources to on-the-ground projects and mitigation teams,” a step up from previous efforts that “have lacked the coordination, landscape-scale focus and robust state investment required to properly address the size and behavior of catastrophic wildfires.”
Even with those funding sources, it can be a challenge to prioritize spending in areas with the biggest benefit, or even address the widespread impacts of fires. Studies have shown that up-front mitigation saves costs on fire suppression, but even that is daunting when the needs are so vast.
Shaver, the Salida forester, says his community seems to understand that narrative and is on board with the cost of mitigation, knowing that the worst risk could be coming during any upcoming fire season.
“Sometimes there’s a feeling that you wish a fire would come through to validate the work,” Shaver says. “But a lot of people say they feel safer, and that in and of itself makes the work successful. Feeling safe is a win whether or not anything ever burns.”
The megafire era gripping the West isn’t just a threat to human development. Fires now burn so intensely that they literally reshape forests, shift tree species, and turn calm waterways into devastating mudflows.
A 2017 University of Colorado study analyzing 15 burn scars left from fires in Colorado and New Mexico found that as many as 80% of the plots did not contain new seedlings. In a 2020 follow-up study project under different climate change scenarios, the most severe scenario, where climate change continues unabated through 2050, showed as many as 95% of ponderosa pine and Douglas fir forests would not recover after a fire. In a “moderate” scenario where emissions decline after 2040, more than 80% of the forest would be replaced by scrubby grassland.
That, said study author Kyle Rodman, could have serious implications for waterways, due to the lack of established trees to stabilize soil and reduce the risk of flooding.
“Just because there aren’t trees doesn’t mean there’s no vegetation. Grasses and shrubs can hold back the soil, but it won’t be the same,” says Rodman, now a postdoctoral research assistant at the University of Wisconsin.
Nearly two decades later, the site of the 138,000-acre Hayman Fire, which burned in an area southwest of Denver in 2002, is still marred with patches of bare ground. That fire, according to a U.S. Forest Service (USFS) study, was so severe in areas that it consumed the canopy foliage as well as the seed bank for the forest’s ponderosa pines and Douglas firs, limiting regeneration. Overall, the study predicted “gradual return to preferred conditions” in the Hayman Fire area, though some of the worst-hit patches may see permanent vegetation changes.
In lower elevations, some of the heartier species, like the ponderosa pine and Douglas fir, are having trouble regrowing because of the increased heat and months-long drought. A 2018 study found that even seedlings of those species that were given supplemental water in burned areas had lower survival rates than expected because of the harsh natural conditions.
“When you’re planting a garden, those first few days are so critical. The plants need water to establish their roots and get healthy,” Rodman says. “Trees work a much longer timescale. Those first few years should be cool and wet and we just don’t have those conditions too often.”
Some tree species, like the high-elevation lodgepole pine, generally rely on fire because the heat helps them open and release seeds. But recent fires are burning so intensely that even lodgepole cones are consumed.
A 2020 study in BioScience found that burned forests are showing “major vegetation shifts” and recovering more slowly than expected. In some cases, heartier species might give way to drier shrub-dominated vegetation that can burn more easily. The study found that, generally, those post-fire “forested areas will have climate and fire regimes more suited to drier forest types and non-forest vegetation.”
That means that hearty forests used to adapting to natural changes are now facing conditions “outside the realm of the disturbances that some forests can handle,” says lead author Jonathan Coop, a professor of environment and sustainability at Western Colorado University.
“We have this paradigm that fire is a natural part of the forest and that forests will always recover,” Coop adds. “These days, we shouldn’t count on that.”
That vegetation shift is especially worrisome for waterways. Normally, forest floors soak in rain and snowmelt, releasing it to waterways slowly throughout the spring and summer. Burn-scarred watersheds, however, have faster runoff and a lower water yield because of the loss of natural material and because of hydrocarbons from smoke permeating the soil. A USFS analysis found that more than 50% of wildfire-scarred land area in Colorado showed increased erosion potential, mudslide threats, and sediment in streams for at least 3-5 years after a fire.
Those effects can last even longer depending on natural conditions, says USFS research engineer Pete Robichaud. The wild seasonal swings from climate change are challenging forests by dumping more precipitation on less stable ground.
“The drought cycle is bigger and the wet cycle is more intense,” Robichaud says. “The perfect storm is a high-severity fire followed by a high-intensity rainfall event.”
The harsh natural conditions, as well as widespread damage from bark beetles, has complicated typical recovery efforts. Some scientists say the rapid changes in forest conditions and fire characteristics make it hard to know what the best recovery strategy is. In some forests, for example, aspen trees that regenerate from low-ground structures rather than relying on seeds to sprout may dominate. Especially in low-elevation areas, shrubbier species like the Gambel oak may regrow faster in forests once driven by conifers.
While replanting is a natural step in recovery (USFS hosts six national nurseries that act as seed banks, although it has restrictions on where certain species can be planted), there are even concerns that the natural conditions should prompt a re-examination of how best to revitalize forests. Ultimately, Coop says, we should expect that forests may not look the same as they did in a pre-megafire era.
“I think this points to the need for all stakeholders and the public to start to think outside the box as far as how we evaluate the forests and ecosystems we depend on,” says Coop. “We might have to think about what ecosystems we are saving and under what circumstances we’ll have to let things go and let some changes unfold.”
A version of this article was first published in the Headwaters magazine Fall 2021 issue.
Jason Plautz is a journalist based in Denver specializing in environmental policy. His writing has appeared in High Country News, Reveal, HuffPost, National Journal, and Undark, among other outlets.