The US Senate has passed a landmark bipartisan bill that will dedicate billions of dollars to the country’s national parks for making critical repairs and double spending on a popular conservation program.

Voting 73 to 25 in favour, the Senate passed legislation allocating $9.5 billion over five years to tackle a critical maintenance backlog and guaranteed $900 million to the federal Land and Water Conservation Fund (LWCF). The House is expected to approve the legislation.

A rare bipartisan success story, the legislation would be the most significant for conservation in nearly half a century.

The Great American Outdoors Act aims to repair the National Park Service’s ageing infrastructure in more than 400 locations across the country which includes California’s Yosemite, the Great Smoky Mountains in North Carolina and Tennessee and the Maritime Heritage Trail at Biscayne in the Florida Keys.

The parks system also includes iconic sites of American history including the Gettysburg battlefields and the Martin Luther King, Jr National Historical Park in Atlanta which encompasses Dr King’s birth

Lawmakers persuaded Donald Trump to support the bill even though he repeatedly tried to slash spending for the federal LWCF in his budget proposals. Mr Trump has tweeted in favour of the lands bill, saying it “will be HISTORIC for our beautiful public lands.”

New Mexico Senator Tom Udall, whose father helped enact the program in the 1960s while head of the Interior Department, described the measure as landmark legislation that will for the first time permanently fund the LWCF at $900 million per year. The fund is fuelled by revenues from offshore oil and gas leasing.

“America’s public lands are at the very core of who we are,” the New Mexico Democrat told the Associated Press. “Full and permanent funding for LWCF — one of the most successful conservation tools we have to protect and expand our public lands — is a historic game-changer for New Mexico and the nation.”

Republican Senator Cory Gardner, of Colorado, one of the bill’s chief sponsors, said the bill will create at least 100,000 jobs, while restoring national parks and repairing trails and forest systems.

Those measures are especially needed now, when communities surrounded by public lands have high unemployment rates because of shutdowns caused by the coronavirus pandemic, Mr Gardner said.