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The Fisheries and Wildlife Resources Group
Our Experienced and Capable Staff

Mike Horn, Group Manager, mhorn@usbr.gov, 303-445-2203

The Fisheries and Wildlife Resources Group has a highly experienced senior scientific staff with over 250 combined years of research and Reclamation experience. We are proven specialists with extensive experience in all disciplines needed for environmental sciences and regulatory studies and assessments, along with insider knowledge of Reclamation facilities, history, and issues. Click on the names below or scroll down to view more information about each of our staff members.

Darrell Ahlers
Biologist
Ray Bark
Biologist
Yvonne Bernal
Natural Resource Specialist
Eric Best
Biologist
Susan Broderick
Fish Biologist
Durel L. Carstensen
Biologist
Kathleen Fenton
Environmental Biologist
Michael Horn
Group Manager
Aquatic Scientist
Chuck Hueth
Biological Technician
Jarod Hutcherson
Fish Biologist
Cathy Karp
Research Fishery Biologist

Dave Moore
Wildlife Biologist

Don Portz, Ph.D.
Fishery Biologist
Gregory Reed
Natural Resource Specialist
Shaun Root
Biologist
Juddson Sechrist
Biologist
Rebecca Siegle
Natural Resource Specialist
Zak Sutphin
Biologist

 

 

Darrell Ahlers, Biologist


Experience:
30+ years experience, B.S. Biology

Specialties: Avian Studies, Wildlife Biology, Population Surveys, Environmental Assessments, Wetland Delineation, Environmental Regulations and Mitigation Strategies

 


Email:
dahlers@usbr.gov

Phone: 303-445-2233

Cell: 303-913-4746

Darryl Ahlers, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Ray Bark, Biologist


Experience:
15+ years experience, B.S. Biology, M.S. Biology

Specialties: Fishery Biology, Tracking and Telemetry Studies, Entrainment Studies, Threatened and Endangered Species, Fish protection facility Evaluations, Temperature Modeling, Biological Opinions, Fish Friendly Pump Evaluations


Email: rbark@usbr.gov

Phone: 303-445-2204

Cell: 303-478-8559

View Technical Reports

Ray Bark, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Yvonne Bernal, Environmental Resource Specialist


Experience:
20 years experience, M.S. Fishery and Wildlife Biology 1996, Colorado State University Fort Collins; B.S. Biology and B.S. Chemistry, 1990 University of Southern Colorado, Pueblo.

Specialties: Environmental compliance, Clean Water Act permitting, and NEPA Coordinator; Environmental Impact Statements, Environmental Assessments, Categorical Exclusions; California Environmental Quality Act document; Endangered Species Act Biological Assessments, and various research studies.



Email:
Please call

Phone: 303-445-2205

Cell: 720-300-7353

Yvonne Bernal, natural resources specialist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Eric Best, Biologist


Experience:
10+ years experience, B.S. Biology

Specialties: Fishery Biology, Population Surveys, Entrainment Studies, Field Investigations, Electrofishing, Hydroacoustics, Native Fish, Fish Telemetry


Email:
ebest@usbr.gov

Phone: 303-445-2179

Cell: 303-829-1351

Eric Best, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Susan Broderick, Fish Biologist

Experience: 30+ years experience, B.S. Natural Resource Management, MS Wildlife Management, 1 year Post Graduate Studies in Fisheries Biology

Specialties: Fish Biology and Management, Wildlife Biology and Management, Bat Research and Monitoring, Avian Studies, NEPA and ESA Compliance



Email:
sbroderick@usbr.gov

Phone:
303-445-2235

Cell:
303-929-0995

Susan Broderick, Fish Biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Durel L. Carstensen, Biologist

Experience: 3+ years, B.S. Wildlife and Fisheries Science.

Specialties: Wildlife Biology, Fishery Biology, Avian Studies, Population Surveys, Fishery Investigations, ArcGIS, and Boat Operator.



Email:
dcarstensen@usbr.gov

Phone:
303-445-2218

Cell:
712-790-0945

Durel L. Carstensen, Biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Kathleen Fenton, Environmental Biologist

Experience: 30+ years experience, B.A. Environmental Biology, University of Colorado, Boulder.

Specialties: Vegetation Mapping & Surveys (NVCS standards and protocols), Natural Resource Inventories and Evaluations, GIS Project & Database Development, Environmental Assessments, In-stream Habitat Mapping.



Email:
kfenton@usbr.gov

Phone:
303-445-2274

Kathleen Fenton, Environmental Biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Michael Horn, Group Manager, Aquatic Scientist, GP Client Liason


Experience:
 20+ years experience, B.S. Biology, Northern Arizona University; M.S. Ecology, University of Tennessee; Ph.D. Zoology, Arizona State University

Specialties: Hydroacoustic fishery surveys and fish behavioral studies; entrainment studies; fish guidance; lake surveys, and physical limnology


Email:
mhorn@usbr.gov

Phone: 303-445-2203

Cell: 303-548-2783

Mike Horn, Aquatic Scientist, with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Chuck Hueth, Biological Technician


Experience:
5+ years experience, B.S. Wildlife Biology, Montana State University

Specialties: Fishery Investigations, Entrainment Studies, Fish Tagging and Telemetry, Field Equipment Design and Improvement, Boat Operator, Aquaculture Facility Maintenance


Email:
chueth@usbr.gov

Phone: 303-445-2183

Cell: 406-899-3181

Chuck Hueth, Biological technician, with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Jarod Hutcherson, Fish Biologist


Experience:
B.S. Biology

Specialties: Ecology, Toxicology, Telemetry, Aquaculture, Larval Fish Entrainment


Email:
jhutcherson@usbr.gov

Phone: 303-445-2011

 

Jarod Hutcherson, Fishery Biologist, with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Cathy Karp, Research Fishery Biologist


Experience:
25+ years experience, B.S. Biology, M.S. Fishery Biology

Specialties: Fishery Biology, Sonic and Radio Tracking Studies, Tagging, Fishery Behavior, Fishery Protection Facility Studies, Threatened and Endangered Species, Predation


Email: ckarp@usbr.gov

Phone: 303-445-2226

Cell: 303-883-3930

View Technical Reports

Cathy Karp, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Dave Moore, Wildlife Biologist


Experience:
10+ years experience, B.S. Wildlife Biology, Colorado State University

Specialties: Herpetology Surveys, Environmental Assessments, Wildlife Population Surveys, Fishery Biology, Entrainment Investigations



Email: SdavidMoore@usbr.gov

Phone: 303-445-2242

Cell: 303-720-3658

View Technical Reports

Dave Moore, wildlife biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Don Portz, Ph.D., Fishery Biologist


Experience:
10+ years experience; B.S. Biology, 1995, State University of New York at Albany; M.A. Aquatic Biology-Fish Ecology, 1999, University of Colorado; Ph.D., Fish Ecology/Physiology, 2007, University of California, Davis.

Specialties: Physiological Ecology, Physiological Stress of Fishes, Fish Swimming Kinematics and Performance, High Speed Video Camera, Morphological and Physiological Adaptations, Predator/Prey Relationships, Conservation of Endangered Fishes, and Fisheries Management. Fish-Holding-Associated Stress in Estuarine Fishes at South Delta Fish Salvage Operations, examining effects on plasma constituents, swimming performance, and predator avoidance.

Email: dportz@usbr.gov

Phone: 303-445-2220

Cell: 303-859-9505

View Technical Reports

Don Portz, fishery biologist  with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Gregory Reed, Natural Resource Specialist


Experience:
25+ years experience, B.S. Biology

Specialties: Wetland Delineation, Riparian Habitat Studies, Avian and Wildlife Surveys, Environmental Compliance and Mitigation, Environmental Assessments


Email: greed@usbr.gov

Phone: 303-445-2208

Cell: 303-341-2160

View Technical Reports

Greg Reed, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Shaun Root, Biologist


Experience:
3+ years experience, B.S. Zoology, Western New Mexico University; M.S. Ecology, University of Idaho.

Specialties: Herpetological Surveys, Population Biology, Riparian Conservation and Ecological Restoration.

Email: sroot@usbr.gov

Phone: 303-445-2222

Shaun Root, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Juddson Sechrist, Biologist


Experience:
15+ years experience, B.S. Wildlife Biology

Specialties: Fisheres Population Studies, Fish Entrainment Studies, Non-Physical Fish Barrier Evaluations, Stream Restoration, Hydroacoustic-based Reservoir Surveys, Gas Supersaturation Studies, Avian Home-range and Migration Studies.


Email: jsechrist@usbr.gov

Phone: 303-445-2198

Cell: 303-619-1646

Juddson Sechrist, biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Rececca Siegle, Natural Resource Specialist


Experience:
15+ years experience, B.S. Biology

Specialties: Avian Biology, Wildlife Biology, Population Surveys, Vegetation Surveys, Wetland Delineation, Environmental Assessments, Environmental Regulatory Issues and Mitigation


Email:rsiegle@usbr.gov

Phone: 303-445-2237

View Technical Reports

Rebecca Siegle, natural resources specialist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Zak Sutphin, Biologist


Experience:
10+ years experience; B.A. Zoology, 2000, Miami University, Oxford, Ohio; M.S. Fisheries and Wildlife Biology, 2009, Colorado State University

Specialties: Fishery Salvage Operations, Aquaculture and Fish Rearing, Physiology of Fish Holding; Fish Parasites and Disease, Phantom High Speed Camera, DOI Certified Motorboat Operator; DOI Certified A.T.V. Operator; PADI certified Research SCUBA diver, Scientific Illustration


Email:
zsutphin@usbr.gov

Phone: 303-445-2141

Cell: 303-328-8597

View Technical Reports

Zak Sutphin, fishery biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.


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This site updated November 3, 2014.