After dodging a blow that would have come with a government shutdown, the National Park Service is focused on a bigger challenge in Congress as it struggles to catch up with a maintenance backlog of more than $22 billion. Debate over the Park Service budget will come to a head again this fall, with House and Senate appropriators about $400 million apart on the Interior Department agency’s budget in their fiscal 2024 funding bills. A website listing the needs at all 63 major parks and some of the smaller units tells the story: Yellowstone National Park, Yosemite National Park and the National Mall in Washington, D.C., each has more than $1 billion in needs.