Technical assistance program

The Washington Department of Fish and Wildlife (WDFW) offers technical assistance to ensure your hydraulic project is designed and constructed in a way that protects fish.

We encourage anyone planning hydraulic projects to submit a general concept for review through the Aquatic Protection Permitting System (APPS). A habitat biologist can then help you develop a fish-friendly project design and answer questions. This is a great place to start if you are new to the HPA application process

A district fish biologist can also help by identifying fish species.

Resources to develop fish-friendly hydraulic projects 

Planning and mapping 

Project guidelines

Designing climate change-resilient culverts and bridges - WDFW's water crossing guidance now considers stream changes due to climate change. We will help you design culverts and bridges using future stream condition data to avoid project failure and maintain fish passage.

Aquatic Habitat Guidelines - Guides to help you with hydraulic project planning and design.

Engineering drawings

The department offers example drawings and checklists for common hydraulic projects to help you develop a complete drawing package.


Mitigation and project enhancements