national parks

Updated at 4:45 p.m. ET

Visiting a national park this summer?

Be prepared to pay more for the experience. Many national parks across the country, faced with tight budgets and delayed maintenance, are increasing entrance fees.

The National Park Service says 106 of the 128 parks that charge entry fees are raising those fees or planning to do so in the coming year.

The list includes many of the most popular parks such as Yellowstone, Yosemite and the Grand Canyon, as well as monuments and historic sites.

New York state's Seneca Lake is the heart of the Finger Lakes, a beautiful countryside of steep glacier-carved hills and long slivers of water with deep beds of salt. It's been mined on Seneca's shore for more than a century.

The Texas company Crestwood Midstream owns the mine now, and stores natural gas in the emptied-out caverns. It has federal approval to increase the amount, and it's seeking New York's OK to store 88 million gallons of propane as well.

It’s May in Rocky Mountain National Park, but on a mountainside 10,829 feet above sea level, snow is falling. It’s pelting Jim Cheatham, a biologist with the National Park Service. Shrugging off the cold, Cheatham seizes a teachable moment. This snow, he said, holds more than just water.

“Chances are it’s carrying the excess nitrogen we’re talking about,” mused Cheatham.

For the past eight years, the biologist has spent most of his time thinking about how nitrogen pollution is changing the park’s forests, wildflowers, and alpine lakes. He’s also been looking for a way to stop it.

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