The cost of getting into some national parks increases on Thursday.
The rates will go up despite the fact that visitation at parks is up, which means bigger crowds, congested traffic and busier visitor centers. But more people aren't translating into a big boost for park budgets. For example, visitation at Rocky Mountain National Park in Colorado is up 20 percent so far this year and Yosemite, Yellowstone and Zion are also seeing double-digit increases. The parks are also seeing the strain. About 100 parks are planning an entrance fee hike.