Under a new proposal from the National Park Service, 17 of the most popular U.S. national parks could see entrance fees for weeklong passes increase from around $25 to $30 to $70 for a single private vehicle.

Fees would also increase to $50 per motorcycle and $30 per person on bike or foot. The near doubling in park fees is expected to generate an additional $70 million annually, which the NPS says would pay for the parks' neglected infrastructure.

Fee increases would go into effect during the five-month season that parks are most visited. The exact duration of these peak seasons vary by park but generally begin in late spring.

The following parks could expect to see a rate increase as soon as 2018: Arches, Bryce Canyon, Canyonlands, Denali, Glacier, Grand Canyon, Grand Teton, Olympic, Sequoia & Kings Canyon, Yellowstone, Yosemite, Zion, Acadia, Mount Rainier, Rocky Mountain, Shenandoah, and Joshua Tree.

Read the full article about national park fee increases by Sarah Gibbens at National Geographic.