PORTOLA, CALIF. • The rutted dirt road twisted ever skyward through miles of lonely pine trees and then abruptly ended at the base of a mountain peak. The workers parked their truck, hoisted a jackhammer, a full gas can and shovels on their backs, and began to march up through the brush.

They didn’t take a trail, because there was no trail. That’s why they had to haul the jackhammer.

The workers — and a tribal monitor, Jess Lowry, who sometimes accompanies them — are part of an audacious infrastructure project that has been quietly underway in California’s northern Sierra for the last several years.

Yard by dusty, backbreaking yard, workers have set out to build 600 miles of trails to connect remote mountain towns such as Sierra City and Chester that once flourished because of gold mining or logging but now are withering. Downieville, for example, was once one of California’s most populous towns; as of the 2020 census, its population was less than 500.

The project — dubbed “Connecting Communities Through the Lost Sierra Route “— aims to reverse the decline. If all goes as planned, mountain bikers, off-road bikers and hikers would flood in, drawn by the opportunity to traverse from town to town a la the Swiss Alps. They would exult in the stark beauty of the landscape, spend oodles of money in local restaurants, bars and hotels, and then go home again — hopefully without driving up housing prices too much.

The trail is the brainchild of mountain biking impresario Greg Williams, 50, a descendant of the Deer Creek band of the Northern Sierra Miwok tribe who somehow founded the famous Downieville Classic mountain biking race at age 22 and has been flying out of the mountains with quixotic plans ever since.

What’s more notable is that local businesses and government leaders have embraced it. That’s in part because Williams — who has a big, bushy beard and a warm but mischievous presence — has a history of pulling off bold feats. But it’s also because, as many local leaders acknowledge, they are desperate to find anything that will make their communities economically viable again. Even if it means inviting a wave of tourism that the area doesn’t have the infrastructure to support. And even if it means doing it as the threat of “mega” wildfires grows ever more perilous.

“We had an economy based first on gold and then on timber, and both of those have waned,” said Lee Adams, who sits on the board of supervisors for Sierra County, which had a population of just 3,200 people according to the 2020 census.

“We have to remake ourselves,” added Plumas County Supervisor Kevin Goss, who represents Greenville, the town that was burned to the ground last year by the Dixie fire. Included in the wreckage was Goss’ business, a pharmacy. “I am looking for … anything to create a little more tourism.”

Goss spoke of bringing high-speed internet, food trucks, luxury camping, “anything and everything” that might boost the economy. Even before the Dixie fire incinerated Greenville last summer, Plumas County was already seeing its population decline.

And yet, officials said, if their plan is successful at drawing hordes of tourists, that achievement could bring its own problems. The last thing anyone wants, several residents said, is to become another Truckee, the mountain resort city near Lake Tahoe to the south. It became a remote-work destination during the pandemic and saw a huge increase in housing prices, pricing out many longtime residents and local workers.

Already, some locals are fed up because of a lack of parking on weekends. And they think they know who to blame: all those cars with bike racks on the back, and other accouterments that seem to scream “Bay Area Driver.” Not to mention a housing crisis that already feels dire.

“It’s becoming a real problem,” said local rancher and Sierra County Supervisor Paul Roen, who backs the idea but said: “We don’t have the infrastructure to support the amount of people coming.”

Jonathan Kusel, who founded the Taylorsville-based Sierra Institute in 1993 with the goal of promoting healthy forests and watersheds by investing in rural communities, said he backs the idea too but noted: “So many rural communities have grown to rely on recreation, and too many of the jobs associated with recreation are service-oriented jobs that don’t pay that well.”

But over and over, many officials and residents made the same point: What else are they supposed to do, if they want to keep living in this magical place of stark granite peaks, gently swaying pine trees and cool rushing rivers? — When Williams is asked where he got the idea for the Lost Sierra Route, his answer starts with the Gold Rush, and the carnage and exploitation it unleashed upon Northern California.

“Gold was discovered pretty early in the Nevada City area along Deer Creek,” he said, “and miners displaced and massacred my tribe.”

His great-great-great-grandfather, along with other members of the mountain Sierra Miwok, fled north into the headwaters of the Yuba River. And when gold miners eventually followed the gold up there, Williams’ ancestor, in order to survive, offered himself as a paid guide. Eventually, Williams said, his forebears ended up leading pack mule trains through the area, creating a thicket of trails branching off from Downieville into the remote mines.

Flash forward more than 100 years, to the late 1980s. Williams was an impetuous teenager; his parents bought him a mountain bike to try to keep him out of trouble. He found an old hand-drawn map of the mines, presumably passed down by his ancestor, and began to explore the area on two wheels. He realized the landscape of his childhood was magnificent, and he never wanted to leave.

But how to make a living here? By the early 1990s, Williams, now a high school graduate and still every bit as passionate about biking, had bought a van and was hustling tourists outside a pizza place in Downieville, offering to drive them and their bikes to the top of a nearby mountain so they could fly down on routes he had devised using his great-great-greatgrandfather’s map.

From his bicycle seat in the woods, Williams also had a front-row seat to the last gasp of mining, as restrictions on dredging cut off some of the few remaining avenues for extracting gold. Around the same time, the federal government imposed new regulations on logging, leading to steep job losses. Even the U.S. Forest Service, which once had an office in Downieville, had decamped for Nevada City.

Williams came up with an idea he thought could help his fledgling business and town at the same time: the bike race that would become the famous Downieville Classic. Many people told Williams the idea was absurd, he said, but he went door to door through Downieville obtaining permission from people to shut off the street. When the first Downieville Classic took place in 1995, it put Williams and the town on the mountain biking map.

By the late 1990s, Williams had a bike shop in Downieville and was running guided trips — in his own vans — for the bikers who were flooding into the area.

And then came the winter of 2001. Storms downed hundreds of trees across the trails that Williams’ business relied on for his guided tours. Williams appealed to the U.S. Forest Service to help move the downed trees, but officials told him they were in a budget crunch and couldn’t do much.

Williams and some of his friends bought a chainsaw. “In the first tree, we got the chainsaw stuck, because we didn’t know what we were doing.” But they persisted. They bought a second chainsaw (in part because they needed to cut up the trees to free the first chainsaw), learned how to operate it, and began hosting volunteer parties to clear trails.

From that season on, trail maintenance was part of Williams’ biking empire, and in 2003, he incorporated a nonprofit, the Sierra Buttes Trail Stewardship, to apply for grants to buy equipment and pay people for trail maintenance.

The trail work — and the fact that Williams was now employing young people from across the area for summer jobs — helped win over some residents who had been skeptical of mountain biking culture, he said. Williams’ nonprofit posted $1.6 million in revenue in 2020, according to Internal Revenue Service filings, and he now has 66 employees and hired two dozen high school students for summer work.

“We’re in the business of revitalizing mountain communities and we use trails as the tool to do it,” Williams said. “It’s about building an economy, so people can stay.”