Bill Stewert with the Bureau of Reclamation presents in front of the Glen Canyon Dam Adaptive Management Program (GCDAMP), a Federal Advisory Committee in the Colora
Drew E Eppehimer, PhD
Drew Eppehimer is a fish biologist with the USGS Southwest Biological Science Center's Grand Canyon Monitoring and Research Center in Flagstaff, AZ. His research examines the environmental drivers of fish populations in the Colorado River Basin.
Drew's research interests broadly span aquatic ecology including fish and invertebrates in both lakes and rivers. His research examines coupled human-natural systems such as artificial and regulated river systems and currently focuses on how drought, water storage, and reservoir operations impact biological invasions in the Colorado River Basin. His models quantify invasion risk and inform smallmouth bass management efforts in the Grand Canyon.
Science and Products
Smallmouth bass expansion downstream of Glen Canyon Dam
In the Upper Colorado River Basin, smallmouth bass ( Micropterus dolomieu ) are considered the greatest threat to native fishes and have been linked to declines in federally protected humpback chub ( Gila cypha ), including one population that was rapidly extirpated in the past. Long-term management efforts have been underway to remove smallmouth bass from rivers in the Upper Basin, but smallmouth...
The Impacts of Climate Change and Water Supply Management on Fish in the Colorado River
The Colorado River and its major tributaries provide a crucial water supply for more than 40 million people in the American Southwest and in California. This water supply is primarily used in irrigated agriculture but also provides essential drinking water to many large metropolitan areas. Hydropower is also produced at many of the large dams on the river. River flows have declined during the past
A DOI employee presents in front of a federal working group
Bill Stewert with the Bureau of Reclamation presents in front of the Glen Canyon Dam Adaptive Management Program (GCDAMP), a Federal Advisory Committee in the Colora
NPS Employee Boating Down Colorado River
Jeff Arnold with the National Park Service drives a motorboat down a stretch of the Colorado River near Lee's Ferry.
Video Description: A man with white hair and a beard wears an orange waterproof jacket as he steers a motorboat through red canyons.
Jeff Arnold with the National Park Service drives a motorboat down a stretch of the Colorado River near Lee's Ferry.
Video Description: A man with white hair and a beard wears an orange waterproof jacket as he steers a motorboat through red canyons.
A scientist in the Flagstaff fish lab
U.S. Fish and Wildlife Service employee David Ward returns a fish to its tank in a fish lab in Flagstaff, Arizona.
Video Description: A tall man holds a fish by the mouth as he moves it from the net back into its grass-lined enclosure.
U.S. Fish and Wildlife Service employee David Ward returns a fish to its tank in a fish lab in Flagstaff, Arizona.
Video Description: A tall man holds a fish by the mouth as he moves it from the net back into its grass-lined enclosure.
Experimental flow at Glen Canyon Dam
Water released from the bypass jet tubes from the Glen Canyon Dam.
Video Description: Water shoots from a steel tube connected to the dam and into a wide river.
Water released from the bypass jet tubes from the Glen Canyon Dam.
Video Description: Water shoots from a steel tube connected to the dam and into a wide river.
Science and Products
Smallmouth bass expansion downstream of Glen Canyon Dam
In the Upper Colorado River Basin, smallmouth bass ( Micropterus dolomieu ) are considered the greatest threat to native fishes and have been linked to declines in federally protected humpback chub ( Gila cypha ), including one population that was rapidly extirpated in the past. Long-term management efforts have been underway to remove smallmouth bass from rivers in the Upper Basin, but smallmouth...
The Impacts of Climate Change and Water Supply Management on Fish in the Colorado River
The Colorado River and its major tributaries provide a crucial water supply for more than 40 million people in the American Southwest and in California. This water supply is primarily used in irrigated agriculture but also provides essential drinking water to many large metropolitan areas. Hydropower is also produced at many of the large dams on the river. River flows have declined during the past
A DOI employee presents in front of a federal working group
Bill Stewert with the Bureau of Reclamation presents in front of the Glen Canyon Dam Adaptive Management Program (GCDAMP), a Federal Advisory Committee in the Colora
Bill Stewert with the Bureau of Reclamation presents in front of the Glen Canyon Dam Adaptive Management Program (GCDAMP), a Federal Advisory Committee in the Colora
NPS Employee Boating Down Colorado River
Jeff Arnold with the National Park Service drives a motorboat down a stretch of the Colorado River near Lee's Ferry.
Video Description: A man with white hair and a beard wears an orange waterproof jacket as he steers a motorboat through red canyons.
Jeff Arnold with the National Park Service drives a motorboat down a stretch of the Colorado River near Lee's Ferry.
Video Description: A man with white hair and a beard wears an orange waterproof jacket as he steers a motorboat through red canyons.
A scientist in the Flagstaff fish lab
U.S. Fish and Wildlife Service employee David Ward returns a fish to its tank in a fish lab in Flagstaff, Arizona.
Video Description: A tall man holds a fish by the mouth as he moves it from the net back into its grass-lined enclosure.
U.S. Fish and Wildlife Service employee David Ward returns a fish to its tank in a fish lab in Flagstaff, Arizona.
Video Description: A tall man holds a fish by the mouth as he moves it from the net back into its grass-lined enclosure.
Experimental flow at Glen Canyon Dam
Water released from the bypass jet tubes from the Glen Canyon Dam.
Video Description: Water shoots from a steel tube connected to the dam and into a wide river.
Water released from the bypass jet tubes from the Glen Canyon Dam.
Video Description: Water shoots from a steel tube connected to the dam and into a wide river.