The move is to protect the park’s native and wild trout fisheries. High temperatures and low river flow must improve until the fishing ban is lifted.

There’s a new milky blue pool in Yellowstone National Park.

Yellowstone National Park closed the Madison River, the Firehole River and the Gibbon River downstream of Norris Campground, as well as those rivers' tributaries, on July 12. Fishing draws about 50,000 visitors to Yellowstone each year,