The National Park Service says it needs the increased revenue to deal with aging infrastructure. But some fear the higher fees will price people out.

Mladen Antonov / AFP / Getty Images The North Rim of the Grand Canyon.

The admission fee to visit some of America's most popular national parks could skyrocket to $70 as officials look for ways to shore up funding to repair billions of dollars in aging infrastructure.

The National Park Service announced the proposed fee hikes Tuesday. Under the plan, admission during "peak season" — or the busiest months of the year — at 17 parks would rise to $70 per vehicle. Motorcyclists would have to pay $50 to enter the parks, while people on foot or bikes would face $30 admission fees. The new admission pricing would apply to the Grand Canyon, Yellowstone, Yosemite, Zion, Grand Teton, and other popular parks, most of which are in the West.

Julie Jacobson / AP Photographers at Delicate Arch in Arches National Park on Dec. 31, 2010.

The prices represent a huge increase over what visitors to the parks currently pay. At the Grand Canyon, Yellowstone, Yosemite and other parks, drivers now pay $30 per vehicle. Other parks are cheaper, such as Canyonlands, where drivers can enter for $25 and pedestrians for $10. Tuesday's proposed price increases comes after the Park Service raised the cost of the lifetime senior pass from $10 to $80.

The new, higher fees are designed to increase revenue to the Park Service, which estimates it would bring in an additional $70 million per year. The money is "badly needed," the agency says, and would be used for "improvements to the aging infrastructure of national parks." "This includes roads, bridges, campgrounds, waterlines, bathrooms, and other visitor services," the Park Service said in a statement. The agency did not respond to BuzzFeed News' request for comment Tuesday evening.

Mladen Antonov / AFP / Getty Images People at Yellowstone National Park on May 11, 2016.

In recent years, the parks' aging infrastructure has grown into a looming and massive problem. A report from 2016 showed found more than $11.3 billion in deferred maintenance across the country. California — home to popular parks including Yosemite and Joshua Tree — alone accounted for more than $1.7 billion of that deferred maintenance.

Nevertheless, many people, including multiple sitting lawmakers, criticized the proposed fee increases, with some arguing that Americans would be priced out of visiting the parks.

Hiking the fees for us to enjoy #NationalParks while @SecretaryZinke flies around on private jets with taxpayer $$$ https://t.co/5sfYQxGNQ6

Does Trump not want people to visit National Parks? These fee hikes are enormous and 30 days isn't enough time for… https://t.co/ZOrCVCUv74

What an absurd proposal. Making national parks even more inaccessible to people of modest means is not how you fill… https://t.co/d74g1NVhNo

This is a terrible proposal - National Parks should be accessible to all Americans, not priced in-kind with free-ma… https://t.co/zRjCOUqVhX

Access to National Parks is the right of all Americans, not just ppl who can afford the entry fee. This is obscene. https://t.co/yokGq9ZtJk