More geological changes are occurring at Yellowstone National Park, as another hole forms in one of the park's basins. The hole is a blue water spring, discovered by geologists in April as they conducted routine maintenance of temperature logging stations at Norris Geyser Basin, according to the U.S. Geological Survey.

There’s a new milky blue pool in Yellowstone National Park. Yellowstone geologists discovered the baby hydrothermal feature in April while doing routine work at Norris Geyser Basin, the park’s oldest geothermal area,

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,