Executive Director, Beavers Northwest
School of Environmental and Forestry Sciences, U. of Washington
My Research Interests
Current climate models predict that the Pacific Northwest will experience considerable hydrologic alterations over the next century. Summer precipitation and stream flow will likely decrease, as will snowpack; snow melt is projected to occur earlier in the year, and winter precipitation, storm intensity, and stream temperatures will likely increase. These changes may threaten sensitive habitats and species as well as ecosystem resilience. ESA-listed fish and wildlife, such as salmon and steelhead, will undoubtedly suffer additional declines in their already limited habitat if these projections are realized. The types of impoundments that beavers (Castor canadensis) create may be able to offset some of the anticipated hydrologic and temperature changes. Beaver impoundments have been shown to attenuate peak flows, recharge groundwater and hyporheic flows, and regulate stream temperature and base flow. Little research, however, has been done to quantify these benefits. I am assessing how beaver dam networks modify measures of stream water quantity, such as residence time, base flow, and hyporheic lateral flow as well as stream temperature. My research explores how effective beaver reintroductions and beaver impoundments can be at mitigating hydrologic alteration due to climate change. The products of this research will be used to inform restoration policy and planning efforts in headwater riparian systems.
University of Washington Ph.D., Aquatic Ecology, 2013 - 2017
University at Albany M.S., Biodiversity, Conservation, & Policy, 2002 - 2004
University of Wisconsin-Milwaukee B.S., Biological Sciences, 1996 - 2001
University of Wisconsin-Milwaukee B.S., Evironmental Sciences & Conservation, 1996 - 2001
Ph.D Student & instructor
School of Environmental and Forestry Sciences, University of Washington July 2013 - Present
GIS Instructor (TA), January 2014 - present
Instructed GIS 250/520 section. Duties included instruction, curriculum setting , lesson planning, and grading.
Capstone Advisor, January 2014 - present.
Direct internship activities and senior research of ESRM students. Moreover, I assist each student in developing an independent scholarly project that dovetails with their hands-on work.
Surface Water Management, Snohomish County January 2009 - July 2013
Beaver Management Program
Managed County’s non-lethal beaver program and provide regional expertise in non-lethal beaver management to other jurisdictions and agencies. Install and maintain flow control and beaver exclusion devices, supervise programmatic beaver device permitting, and provide technical assistance to private landowners. Work with landowners and public to raise awareness on benefits of beaver dams and reduce conflict.
Land Cover Classification and Change Detection Project
Collaborated on County land-cover and wetland maps biannually using a model based on remotely sensed and other data across 369,000 acre study area. Develop change detection model using change-vector analysis. Biannual mapping was used to determine types of critical area impacts occurring and the drivers for these impacts.
Intensive Catchment Study:
Functions and Values Assessment of Critical Areas Assessed impacts of development on ecological function of headwater watersheds. The study evaluated the effectiveness of various sized riparian buffers in improving watershed health utilizing a suite of biotic and abiotic indicators.
Snohomish County Shoreline Inventory and Monitoring Project
Ongoing inventory of shoreline conditions on 288 km of river shorelines and 45 km of lake shorelines to document the extent and type of shoreline modifications, instability, and other measures of disturbance.
Surface Water Management Regulatory Program
Established and managed SWM’s regulatory program for aquatic lands restoration, participate in regulatory policy direction-setting, authorized and certified project compliance for County environmental regulations, and acted as SWM’s Authorized Agent when coordinating with outside agencies.
Environmental Services & PDS, Snohomish County April 2006 - January 2009
Authored Critical Area Studies, mitigation and monitoring reports. Conducted site reviews. Provided best available science and permit expertise to County departments. Met with public on project sites, and was staff representative on technical advisory committees and interest groups. Performed wetland delineation, rating, and categorization. Conducted stream typing, OHWM delineation, and critical species review.
US Dept of Defense (with Anteon Corp) 2004 - 2006
Managed Camp Pendleton’s (CPEN) riparian mapping and ecological community change detection program. Designed and conducted rare plant and endangered species and habitat monitoring programs. Authored land management chapters of CPEN’s Integrated Natural Resources Management Plan. Participated in designing CPEN’s Long Term Ecological Trend Monitoring program. Designed and coordinated riparian and wetland delineation, mitigation, and restoration. Provide ecological expertise in planning, writing and review of Environmental Assessments (EA) and Environmental Impact Statements (EIS).
University at Albany, 2002 - 2004
Analyzed the relationship between canopy and sub-canopy structure in forested wetland communities to identify properties that could be utilized for remote classification and monitoring of forested wetlands. Results showed that forested wetlands with increasing levels of human-induced disturbance were more difficult to identify remotely, making suburban isolated wetlands the most vulnerable as well as most challenging to monitor. Assisted in planning, coordinating, and executing wetland remote sensing project. Led site selection program and conducted outreach to private landowners. Collected physical, vegetation, habitat, and hydrogeomorphic wetland data. Compiled GIS database, managed data, and performed statistical analysis and QA/QC.
Urban Ecology Center 2000 - 2002
Independent Undergraduate Researcher
Savannah River Ecology Laboratory, 2000 - 2000
Awarded NSF fellowship to conduct research at the SREL in phytoremediation and biogeochemical applications on pyrite and acid mine drainage. Designed, planned and executed a pyrite toxicity amelioration experiment using a suite of biotic, abiotic, and chemical treatments.
Honors, Awards, & Grants
Beaver relocation in the Skykomish Watershed
USGS Student Interns in Support of Native American Relations (SISNAR) Program, August 2014
Awarded funding to employ two USGS interns to participate in monitoring and relocation field work.
Grant: Use of unmanned aerial vehicles to measure how beaver reintroductions mitigate effects of climate change
Northwest Science Association, Student Research Grant Competition, April 2014
Grant: Using Beaver to Restore Ecosystem Functions in the Skykomish Watershed Ecotrust,
Whole Watershed Restoration Initiative, March 2014, http://www.ecotrust.org/wwri/
Grant: Evaluating the use of beaver relocation as an ecosystem tool in headwater steams of the Snohomish River Basin
Northwest Indian Fisheries Commission, January 2014
Grant: Using Beaver as an Ecosystem Service Provider on Forestlands in the Snohomish River Basin
Northwest Indian Fisheries Commission, July 2013
Select Publications & Presentations
Benjamin Dittbrenner. October 2014. Successful Beaver Management Techniques, Jefferson County Conservation District Meeting
Benjamin Dittbrenner, Jason Schilling. October 2014. Skykomish Beaver Project, Snohomish River Basin Salmon Recovery technical Committee Meeting
Benjamin Dittbrenner. March 2014. PNW beavers are a lot like you, a little different, University of Washington SEFS Water Seminar,
Benjamin Dittbrenner. November 2013. Successful Beaver Management Techniques, Regional Fisheries Enhancement Group, 2013 Retreat, Cle Elum, WA,
Wetland mapping in Snohomish County Association of American Geographers 2011 Annual Meeting, Seattle, WA 2011 Authors: Gi-Choul Ahn, Andre Coleman, Jerry Tagestad, Andy Haas, Mike Rustay, Benjamin Dittbrenner, Hahn Chul Jung, Darla Boyer
Community composition variation in Forested Wetlands: Ground-based and Hyperspectral Remote Sensing Techniques Master of Science Thesis Defense, University at Albany July 2004 Authors: Benjamin Dittbrenner
Remote Sensing and Ground-based Approaches for Describing Forested Wetlands Northeast Natural History Conference, 8th annual meeting, Albany, NY. May 2004 Authors: Benjamin Dittbrenner, G.S. Kleppel
Disturbance and the Invasion of Lythrum Salicaria (Purple Loosestrife) Society of Wetland Scientists, 25th annual meeting, Seattle, WA. 2004 Authors: A.H Hartwell, Benjamin Dittbrenner, R.R. Shirer, G.S. Kleppel
Remote Classification and Hyperspectral Assessment of Wetland Ecosystems University at Albany, GIS Symposium, Albany NY November 2003 Authors: Benjamin Dittbrenner, A.L Hartwell, R.R. Shirer, G.S. Kleppel
High Resolution, Hyperspectral Assessment of Wetland Ecosystems: Classification from a Remote Platform Ecological Society of America, 88th Annual meeting, Savannah GA July 2003 Authors: Benjamin Dittbrenner, A.L Hartwell, R.R. Shirer, G.S. Kleppel
High Resolution Remote Sensing: Testing a Monitoring and Assessment Tool For Wetlands Society of Wetland Scientists, 24th annual meeting, New Orleans, LA. June 2003 Authors: Benjamin Dittbrenner, A.L Hartwell, R.R. Shirer, G.S. Kleppel
Evaluating techniques for reducing acid production in reject coal spoil. Formal Presentation, Savannah River Ecology Laboratory, Aiken, SC. September 2000 Authors: Benjamin Dittbrenner, T. Punshon, D. Adriano
Projects & Organizations
Skykomish Beaver Project
July 2013 to Present
Members: Benjamin Dittbrenner, Jason Schilling, Chris Tran, Molly Alves, Chris DiTomaso
Snohomish Beaver Working Group
Skills & Expertise
Ecology Aquatic Ecology Wetland Science Wetlands Higher Education Beaver Management Ecological Restoration Remote Sensing Statistics Spatial Analysis ArcGIS Endangered Species Climate Change Environmental Awareness Science GIS Research Environmental Science Natural Resource Management
English (Native proficiency)
Spanish (Limited working proficiency)
Beaver Conservation & education