Hydraulic Project Approval (HPA) permits

Work that crosses over a waterbody or includes in-water work may require coverage under a Hydraulic Project Approval (HPA) permit from the Washington Department of Fish and Wildlife (WDFW).  Use this page to find out how to apply for HPAs, both individual and general Hydraulic Project Approvals (GHPAs).

See the Complete Permit Application Guidance (pdf 217 kb) for HPAs for information on the different types of HPAs and how to prepare a complete application. This guidance also includes information on modifying HPAs and conflict resolution.

For information on HPAs, also see the WDFW HPA website and the Memorandum of Agreement (MOA) concerning the Implementation of the Fish and Wildlife Hydraulic Code for Transportation Activities (pdf 1.1 Mb). The MOA includes information on how the Washington State Department of Transportation (WSDOT) and WDFW work together to make sure transportation projects are permitted efficiently. This agreement also covers fish passage, chronic environmental deficiencies and mitigation.

Coordinate with your region’s WDFW’s Habitat Biologists before applying for HPAs to make the permitting process quicker and easier.  

Individual HPAs

You will need to apply for an individual HPA if your work does not fit one of the GHPAs below. To apply for an individual HPA, use WDFWs Aquatic Protection Permitting System.  WDFW’s website includes technical assistance information such as fish windows and other project guidelines.

General HPAs 

WDFW issues GHPAs for specific routine maintenance and preservation activities. GHPAs cover the same type of work across the state and are good for five years. Find out when to use each of WSDOTs GHPAs and their requirements below:

Non-compliance procedures

Follow the Environmental Compliance Assurance Procedure (ECAP) for construction activities (pdf 402 kb) for non-compliance events when doing work under contract or geotechnical work. See our Environmental commitments & compliance webpage for information on tracking and managing environmental commitments before, during, and after construction.

Follow the ECAP for Maintenance Activities (pdf 180 kb) for non-compliance events when doing highway maintenance work.