Both Paris and Sleight Creeks run through the preserve. There are also springs and seeps. The creeks provide potential habitat for native Bonneville cutthroat trout. Paris Creek is altered by a water diversion on the Caribou National Forest that dewaters three miles of the creek, part of which passes through the Preserve. In 2024, the diversion will be decommissioned, allowing full stream flow to return along with Bonneville cutthroat trout.