A hiker walks in the new national monument park, known as the Basin and Range taken last fall in Nevada. (Photo by Tyler Roemer)

In a massive expansion of his lands legacy, Obama created three new national monuments Friday in Nevada, California and Texas.

Using his authority under the Antiquities Act, the president created a protected area spanning roughly 704,000 acres in central Nevada’s Basin and Range, as well as smaller ones in California’s Berryessa Snow Mountain and Texas’ Waco Mammoth.

“As many of you know, one of the great legacies of this incredible country of ours is our national parks and national monuments.” told reporters as he prepared to sign the declarations in the Oval Office. “It is something that we pass on from generation to generation, preserving the incredible beauty of this nation, but also reminding us of the richness of its history.”

With the new designations, Obama has established or expanded 19 national monuments for a total of more than 260 million acres of public lands and waters, more than any previous president. The Basin and Range monument alone, at more than 1,000 square miles, is nearly the size of Rhode Island.

[Graphic: Reid’s conservation legacy nears 5 million acres]

Before Friday Obama had protected 1,142,036 acres of public land; that figure has now nearly doubled, to 2,176,821 acres. He has now bested Teddy Roosevelt in terms of protecting more land under the Antiquities Act, though Presidents Carter, Clinton and Franklin Delano Roosevelt have put more land  off limits to development under the law.

“President Obama’s plan to proclaim new national monuments in Nevada, California, and Texas speaks volumes about the power of local citizens who stand up to protect our public lands,” said Mike Matz, director of Pew’s U.S. public lands program.

Obama’s aggressive use of his executive authority in the arena has already prompted a congressional backlash. On Wednesday the House narrowly approved an amendment offered by Rep. Cresent Hardy (R-Nev.) on the Interior Department’s annual spending bill that would block the use of federal money to carry out the presidential designation of a national monument under the Antiquities Act in 17 counties in Arizona, California, Colorado, New Mexico, Nevada, Oregon and Utah.

But GOP leaders pulled the bill the following day, so the fate of the language remains unclear.

The move marks a major victory for retiring Sen. Harry Reid (D-Nev.), who had personally lobbied Obama to create the desert monument. The area, which is sparsely populated and undeveloped, serves as a migration corridor for large mammals such as mule deer and pronghorn, as well as habitat for imperiled species including the sage grouse, hoary bat and the flowering White River catseye.

Collin O’Mara, president and CEO of the National Wildlife Federation, said in a statement that “permanent protection for Basin and Range will preserve priority sage grouse habitat at a critical time when we’re all working hard to recover this iconic bird and avoid the need for further protections under the Endangered Species Act.”

Veterans’ groups also lobbied for the designation: Pamela Alfred, a member of the Vet Voice Foundation and resident of Spring Creek, Nev., said in a statement it was important because “veterans find solace in the Great Outdoors.”

[READ: Reid leaves an indelible mark on Nevada’s desert]

The Basin and Range is significantly larger than the president’s previously biggest national monument, the nearly-500,000-acre Organ Mountains-Desert Peaks in New Mexico. Broadly supported by environmentalists, it is also home to a major earthen sculpture, “City” which the artist Michael Heizer has worked to create over nearly half a century.

With this move, Reid has expanded the scope of protected areas in his home state from roughly 67,000 acres when he took office to roughly 4.8 million acres more than 30 years later.

Obama called the new Nevada monument “one of the most undisturbed corners of the Great Basin region, and its topography is unique.”

But many local office holders and ranchers opposed the designation, arguing it could impede economic development and threaten local grazing operations. While the proclamation stipulates it will not affect any grazing activities in the area Connie Simkins, who serves as secretary as the local grazing board that encompasses one of the affected counties, noted that the creation of the Great Basin National Park ultimately ended grazing there through later regulation.

“We’re scared to death this will be a locked up, worse than wilderness situation,” she said.

Hardy, who represents the two counties in which the monument lies, unleashed a series of tweets and delivered a floor speech decrying the move.

In his floor speech, Hardy described the event in the Oval Office as “demonstrating that having friends in high places is more important than popular will of the people. But the legacy building in the twilight of one’s career shouldn’t be the driver for our nation’s public lands.”

Asked whether Obama designated the monument as a favor to Reid, White House press secretary Josh Earnest told reporters, “Well, obviously Senator Reid has already spoken publicly about his affinity for this particular area of the Nevada desert. And he has been an important advocate for that particular piece of property.”

The two other designations, by contrast, are much less controversial. The new Berryessa Snow Mountain National Monument  encompasses nearly 331,000 acres of public land in northern California’s Inner Coast Range, which has markers of Native American history as well as a range of key species. It is threatened by both wine industry development as well as the growing marijuana industry there.

Supporters of the designation included more than 200 local businesses as well local city and county governments and cultural preservation groups.

John Pickerel, owner of Buckhorn Steakhouse in Winters, Calif., said the move “will enhance recreational opportunities for everyone. It will encourage tourism particularly along scenic Highway 128 from Winters to Napa and create a desirable place for people to live and work.”

Waco Mammoth in Texas ranks as a major paleontological site, featuring well-preserved remains of 24 Columbian Mammoths. The mammoths date back more than 65,000 years, and the site includes the nation’s first and only recorded discovery of a nursery herd of mammoths.

Rep. Bill Flores (R-Tex.) has sought to make the area a national monument through legislation, and the site has been developed and protected by the National Park Service, the City of Waco, Baylor University, and the Waco Mammoth Foundation.

“This new national monument will benefit the city’s economy as well as schoolchildren, scientists and other visitors to this site,” said Suzanne Dixon, senior director of regional operations for the National Parks Conservation Association. “Waco Mammoth is a window to a world lost long ago, and with this designation, visitors from across the country will be able to continue learning about the science and history of these amazing creatures.


Also in Energy & Environment:

Scientists have discovered that living near trees is good for your health

Why the Earth’s past has scientists so worried about sea level rise

Many Americans still lack access to solar energy. Here’s how Obama plans to change that

For more, you can sign up for our weekly newsletter here, and follow us on Twitter here.