The U.S. Senate has passed the Great American Outdoors Act. Conservation groups in Arizona and beyond have been calling for the bill’s passage.

Arizona’s National Park sites are behind nearly $600 million in maintenance needs. The Great American Outdoors Act would put billions toward the country’s National Parks over five years.

The bill would also guarantee funding for the Land and Water Conservation Fund, which supports National Forests, state parks and other public spaces.

Conservation groups say the bill is one of the most significant pieces of public lands legislation in decades. Both Arizona senators voted in favor. The president is expected to sign the bill into law if companion legislation passes in the House of Representatives.