National parks saw a record-setting number of visitors last year. Were they too much of a good thing?

Death Valley, Joshua Tree, Sequoia and Yosemite national parks all set attendance records in 2016 — as did the park system nationwide, recording more than 330 million visits during its centennial year.

A new tally shows 330.97 million recreational visits to national parks last year, a 7.72% increase...