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The Fisheries and Wildlife Resources Group
Our Experienced and Capable Staff

Steve Hiebert, Group Manager, shiebert@usbr.gov, 303-445-2206

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. Our group benefits from the expertise of two senior fishery researchers from the USGS who work with us frequently under cooperative agreement. We also have a skilled pool of contract specialists and technicians that can be quickly augmented to meet mission requirements and time deadlines. 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 Resources Specialist
Eric Best
Biologist
Mark Bowen, Ph.D.
Biologist
Jeanette Carpenter, Ph.D.
Biologist, USGS
Kathleen Fenton
Environmental Biologist
Steve Hiebert
Group Manager

Chuck Hueth
Biological Technician, SAIC
Vicky Johanson
Biologist, SAIC
Cathy Karp
Fishery Biologist
Judy Lyons
Biological Technician
Dave Moore
Wildlife Biologist
Don Portz, Ph.D.
Fishery Biologist
Gregory Reed
Natural Resource Specialist
Stephen Ryan
Biologist, SAIC
Juddson Sechrist
Biologist
Rebecca Siegle
Natural Resources Specialist
Zak Sutphin
Biologist
Ron Sutton
Biologist
Katherine Zehfuss, Ph.D.
Fishery 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 Resources Specialist


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

Specialties: Conducting field studies (including study design, data collection and analysis, Enforcing, evaluating, and processing environmenta permits (especially Clean Water Act permits); writing environmental assessments, environmental impact statements, and other NEPA documents, as well as California Environmental Quality Act documents; Mitigation Strategies, Environmental Assessments, EIS and EA Reviews and Preparation


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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.

 

Mark Bowen, Ph.D, Biologist


Experience: 20+ years experience, B.S. Biology, Ph.D., Biology

Specialties: Fishery Biology, Behavior and Tracking Studies, Predation, Environmental Modeling, EDT Model, Fish Identification Systems and Software, Statistics, Experimental Design, Field Investigations, Entrainment Studies


Email:
mbowen@usbr.gov

Phone: 303-445-2222

Cell: 303-918-9076

View Technical Reports

Mark Bowen, Ph.D., biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Jeanette Carpenter, Ph.D., Biologist, USGS


Experience: 20+ years experience, B.A. Biology and Environmental Studies, UC Santa Cruz, 1984; Ph.D., Wildlife and Fisheries Science, University of Arizona, Tucson, 2000

Specialties: Predator/Prey Relationships, Conservation of Threatened and Endangered Fishes, Fishery and Aquatic Biology, Crayfish Biology and Ecology, Native Fishes, Population and Spawning Surveys, Ecology of Regulated Rivers, Electrofishing


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Email:
jxcarpenter@usbr.gov

Phone: 303-445-2230

View Technical Reports

Jeanette Carpenter, Ph.D., fishery biologist, US Geological Survey, Denver, Colorado.

 

Kathleen Fenton, Environmental Biologist

Experience: 25+ 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.

 

Steve Hiebert, Fishery Biologist, 86-68290 Group Manager


Experience:
30+ years experience, B.S. Biology, New Mexico State University, 1975

Specialties: Fishery Studies, Entrainment Studies, Limnology Studies, Gas Supersaturation, DIDSON Camera, Electrofishing, Automated Fish Counting and Identification, Hydroacoustics, Egg and Larvae Sampling (CIPS)


Email: shiebert@usbr.gov

Phone: 303-445-2206

Cell: 303-883-3271

View Technical Reports

Steve Hiebert, group manager and genius biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Chuck Hueth, Biological Technician, SAIC


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


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Email:
chueth@usbr.gov

Phone: 303-445-2183

Cell: 406-899-3181

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

 

Vicky Johanson, Biologist, SAIC


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

Specialties: Avian Biology, Avian Territory Mapping and Habitat Delineation, Fishery Investigations, Vegetation Surveys


Email: vjohanson@usbr.gov

Phone: 303-445-2292

Cell: 970-222-9443

View Technical Reports

Vicky Johanson, biologist, SAIC, with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Cathy Karp, 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.

 

Judy Lyons, Biological Technician


Experience:
20+ years experience; A.S. 1993, Red Rocks Community College

Specialties: Fishery Field Studies, Tagging and Fish Surgery, Fish Culture and Rearing, Fish Laboratory Operations, Data Entry and Quality Assurance, Graphic Presentations for Posters and Reports.


Email: jmlyons@usbr.gov

Phone: 303-445-2210

Cell: 303-807-7260

Judy Lyons, biological technician  with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Dave Moore, Wildlife Biologist


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

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


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Email:
dmoore@usbr.gov

Phone: 303-445-2242

Cell: 970-481-8332

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.


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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:
20+ 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 and one fine gentleman with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Stephen Ryan, Biologist, SAIC


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

Specialties: Riparian Habitat Surveys, Avian Biology and Telemetry, Vegetation Surveys, In-Stream Flow Studies


Email: sryan@usbr.gov

Phone: 303-445-2234

Cell: 303-709-2197

View Technical Reports

Stephen Ryan, Biologist, SAIC, with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Juddson Sechrist , Biologist


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

Specialties: Fishery Biology, Fishery Population Studies, Hydroacoustics, Gas Supersaturation, Entrainment Studies, Limnology, Avian Surveys


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, Wildlife Biologist, SAIC


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:

Contact Steve Hiebert

View Technical Reports

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

 

Zak Sutphin, Biologist


Experience:
5+ years experience; B.A. Zoology, 2000, Miami University, Oxford, Ohio; M.S. Candidate, Fisheries and Wildlife Biology, 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


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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.

 

Ron Sutton, Fishery Biologist


Experience:
30+ years experience; B.S. Fishery Biology, 1976, Colorado State University, M.A. Zoology, 1980, Southern Illinois University

Specialties: Environmental Permitting Reports for Fishery Issues, In stream Flow Studies using Physical Habitat Simulation System (PHABSIM) and River2D Models, Habitat Assessment for Spawning and Rearing Chinook Salmon, Steelhead, and Bull Trout, Desert Pupfish Movement among Salton Sea Habitats, Effects of Summer Dam Releases on Downstream Juvenile Salmonids Located in Thermal Refugia, Effects of Winter Low-Flow Releases from Dams on Downstream Natural Resources.


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Email:
rjsutton@usbr.gov

Phone: 303-445-2495

Cell: 303-877-5432

View Technical Reports

Ron Sutton, fishery biologist with the Fisheries and Wildlife Resources Group, Denver, Colorado.

 

Katherine Zehfuss, Ph.D., Fishery Biologist


Experience:
5+ years experience, B.S. Biology, Ph.D., Fishery Biology

Specialties: Fishery Biology, Sturgeon Migration and Spawning, Environmental Modeling, EDT Model, Statistics, Data Mining and Exploratory Analyses, Data Base Development, Riparian Ecology


Email: kzehfuss@usbr.gov

Phone: 303-445-2240

Cell: 303-888-7881

Katherine Zehfuss, Ph.D., Biologist, SAIC, with the Fisheries and Wildlife Resources Group, Denver, Colorado.


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This site updated 06-08-09