Federal law may protect the river habitat in the name of endangered fish, but on land, grapevines are king. This article is the first in a two-part series about how scientists are helping find compromise amid local tensions over water supplies.

Through the first week of September 2013, Colorado was exceptionally warm and dry. By September 12, everything had changed.

According to NOAA’s Spring Outlook released today, rivers in half of the continental United States are at minor or moderate risk of exceeding flood levels this spring with the highest threat in...