Augustus E. Winkes,





Gus is an Associate in the Environmental practice group. His practice focuses on contaminated site cleanup and litigation under CERCLA and state superfund statutes. He also advises clients on regulatory compliance and enforcement under federal and state air quality and climate change laws.

Before joining the Firm, Gus interned at the Seattle City Attorney’s Office, the San Francisco City Attorney’s Office and the Sierra Club.

In law school, Gus served as an editor of the University of Michigan Journal of Law Reform and co-founded the Michigan Journal of Environmental and Administrative Law. He also served as a teaching assistant for an undergraduate environmental law and policy course.

Prior to law school, Gus worked as an environmental consultant in Seattle.

Dean’s Scholarship


Dean’s Public Service Fellowship


Certificates of Merit in Environmental Law and Policy, Natural Resources Law, Federal Indian Law and Model Rules and Beyond


Doris Duke Conservation Fellowship

Gus is an active member of the ABA Section of Environment, Energy, and Resources, and a member of the Environmental and Land Use Law Section of WSBA. He is a member of King County Bar Association (2014-present), and was Secretary for the Environmental and Land Use Section from 2014-2016.

Gus received his B.A. in History with honors from Stanford University and holds an M.S. from the University of Michigan School of Natural Resources and Environment.  He received his J.D., magna cum laude, from the University of Michigan Law School in May 2013.


Environmental Practice Group Celebrates Washington Supreme Court Victory

  The Coalition of Coastal Fisheries held a celebratory “crab feed” in Chinook, Washington this past weekend to thank our Environmental Practice Group for its pro bono representation … read more

Washington Supreme Court Orders Enhanced Environmental Scrutiny for Coastal Fossil Fuel Projects

By Gus Winkes and Emerson Hilton Key Takeaways The Washington Supreme Court issued a unanimous decision with significant implications for large coastal developments involving fossil fuels and other … read more

Riddell Williams Environmental Team Helps Secure Washington Supreme Court Victory

On January 12, the Riddell Williams Environmental Practice Group obtained a significant victory on behalf of its client, the Coalition of Coastal Fisheries (CCF), at the Washington Supreme … read more

Air Quality Law and Regulation in the Northwest

Legal Update – Regulation and Litigation Developments in EPA Region 10 By Emerson Hilton, David Weber, and Gus Winkes The Riddell Williams Environmental Practice Group closely tracks developments … read more

The Clean Air Rule: Washington’s Greenhouse Gas Regulation

This month, the Washington Department of Ecology adopted the Clean Air Rule, a much anticipated program for reducing greenhouse gas (“GHG”) emissions in the state.  Washington is among … read more

Air Quality Updates in EPA Region 10 (Pacific Northwest)

Washington Revisions to Startup, Shutdown, and Malfunction Regulations On July 22, 2015, the Washington Department of Ecology (Ecology) announced that it would amend its General Regulations for Air … read more

Enforcement Action: Civil Penalties and Ability-to-Pay Claims

Businesses and other entities may seek to reduce civil penalties in EPA administrative enforcement actions by making an ability-to-pay (ATP) claim.  EPA recently issued new guidance for assessing … read more

Washington’s Proposed Water Quality Assessment: New Data, New Techniques May Trigger New Discharge Requirements

Washington State has proposed an updated water quality assessment that identifies state waters that do not meet water quality standards.  Failure to meet the standards can trigger more … read more

Washington Weighs Carbon Cap

Last week, Washington state legislators introduced Governor Jay Inslee’s $1 billion plan to regulate carbon emissions from 130 industrial facilities, fuel distributors, and electricity importers.  While current political … read more

Riddell Williams Continues Strategic Growth, Hires Three New Attorneys, New Chief Operating Officer and Announces the Election of an Attorney to Principal

Riddell Williams P.S., a firm providing comprehensive legal services to the business community for over 100 years, is pleased to announce the addition of three new attorneys, Katie … read more