The Olympic National Park is among 16 other parks across the nation that the National Park Service is floating a steep increase to entrance fees next year. Visitors to the Grand Canyon and other parks would be charged $70 per vehicle, up from the current $30 fee. At others, the hike is $25 to $70.

In Washington State, the National Park Service is looking to raise fees at Olympic National Park and Mount Rainier National Park. A 30-day public comment period opened Tuesday.

The proposal comes less than two years after many of the parks that charge entrance fees became more costly. The rationale is the same this time around — to address a maintenance backlog and infrastructure projects.

The Park Service says it expects to raise $70 million a year with the latest proposal for parks mostly in the West.

The higher fees would apply during the five busiest, contiguous months. For most that means May through September.