Environmental planning

Use the guidance on this page to document environmental information, analysis, and products during transportation planning for highway corridor and modal facility plans. Find guidance regarding Federal Planning and Environmental Linkages (PEL) at the bottom of this page.

For statewide, regional, or modal plans, contact the appropriate region or modal environmental manager and WSDOT’s National/State Environmental Policy Act (NEPA/SEPA) Program Manager to tailor your efforts.

Before you start

Read Chapter 200: Environmental Considerations in Transportation Planning of the Environmental Manual for legal requirements and policy context.

Environmental screening

Conduct an environmental screening to ensure that environmental context and priorities inform the plan’s practical recommendations. We encourage planners to collect information on the following key environmental assets that WSDOT must maintain in good condition, and other long-term considerations.

Note: this list does not include all environmental information considered at the project level.

Agency staff can access the suggested data layers through our internal GIS workbench in the Environmental section.

Refer to the following guidance and contact the appropriate region or modal environmental manager and WSDOT’s NEPA/SEPA Program Manager for assistance.

Fish passage barriers

We consider fish barriers for any future project that alters the roadway prism or adds infrastructure within the existing right of way. Protect and maintain any previously corrected barriers.

Use the ‘WSDOT Sites’ data layer in our GIS Workbench to locate fish passage barriers and corrected barriers within or adjacent to the planning study area.

Contact WSDOT’s Stream Restoration Program Manager to verify information and determine if the fish passage inventory needs an update. Updating fish passage inventories during planning helps us identify future funding needs.

Wetland compensatory mitigation sites

We construct wetland compensatory mitigation sites to compensate for wetland impacts that cannot be avoided. We must monitor many of these important assets for 10+ years and protect them in perpetuity.

Use the ‘Environmental Restoration Sites’ data layer in our GIS Workbench to locate wetland compensation sites within the planning study area.

Contact WSDOT’s Region or Modal Environmental Manager or Wetland Program Manager to verify information. Consider additional wetland information later as project-level information develops using guidance on the Wetland & stream reconnaissance web page.

Chronic environmental deficiencies (CED)

We track locations along state highways where frequent maintenance repairs of eroding streambanks can harm fish habitat. We design long-term fixes that reduce the impacts on fish and fish habitat adjacent to highways while increasing the safety and resiliency of highways.

Use the ‘Chronic Environmental Deficiencies, WSDOT’ data layer in our GIS Workbench to locate any CED sites within the planning study area.

Use CED information to propose practical long-term solutions that address active CED sites and protect resolved CED sites. Contact WSDOT’s CED Coordinator to verify information.

Noise walls

We build and maintain noise walls to reduce the level of road noise. We maintain them in perpetuity, unless moved to accommodate future projects. We may propose retrofit noise walls in priority areas if funding is available.

Use the ‘Noise Walls, Built’ and ‘Noise Walls, Proposed’ data layer in our GIS Workbench to locate existing and proposed retrofit noise walls within the planning study area.

Contact WSDOT’s Air, Noise, and Energy Manager to verify information.

Historic bridges

We protect and maintain state-owned bridges on, or eligible for, the National Register of Historic Places. We consider other cultural and historic resources as project-level information develops.

Use the ‘WSDOT Historic Bridges’ data layer in our GIS Workbench to locate historic bridges within the planning study area.

Contact WSDOT’s Historic and Cultural Resources Specialist to verify information.

Stormwater best management practice (BMP) sites and retrofit priorities

We construct and maintain stormwater BMPs to reduce the impacts of stormwater runoff from paved surfaces. Future projects must protect or replace existing BMPs. Projects that expand impervious surfaces or are within priority retrofit areas may require new BMPs. 

Use the ‘Stormwater Features, BMPs’ data layer in our GIS Workbench to locate BMP sites within the planning study area.

Contact WSDOT’s Stormwater Features Manager to locate any medium or high retrofit priorities within the planning study area and to verify all stormwater information.

Climate vulnerability

We consider climate change and extreme weather impacts.

Use the ‘CIVA – Climate Vulnerability Assessment’ data layer in our GIS workbench to locate WSDOT assets within the planning study area with medium or high vulnerability to climate threats. Consult with local planning partners to determine availability of additional area-specific climate data.

Use this information to document how climate change and extreme weather vulnerability are considered. Propose practical long-term solutions that improve the resilience of the transportation system in the planning area.

Contact WSDOT’s NEPA/SEPA Program Manager to verify information. Refer to Guidance for considering impacts of climate change in WSDOT plans (pdf 606 kb).

Habitat connectivity

We prioritize opportunities that protect fish, wildlife, and habitat resources, and reduce collisions between wildlife and vehicles along state highways.

Use the ‘Habitat Connectivity – Maximum Rank, Non-Sensitive’ data layer in our GIS Workbench to locate any medium or high priority segments for Ecological Stewardship Rank or Wildlife-related Safety Rank within or adjacent to the planning study area.

Use the ‘Pollinator Habitat Rankings’ data layer in our GIS Workbench to locate any medium, high, or very high priority segments for Pollinator Habitat Rank, Urban Gateway Habitat Rank, or Monarch Habitat Rank within or adjacent to the planning study area.

Use this information to propose practical solutions for improving habitat connectivity. Contact WSDOT’s Habitat Connectivity Biologist to verify information.

Federal Planning and Environmental Linkages (PEL)

Federal PEL studies consider environmental, community, and economic goals early in the transportation planning process and carry them through project development, design, and construction. We recommend PEL for planning studies likely to lead to a major transportation improvement project that would require detailed environmental review. A completed PEL study can expedite an Environmental Impact Statement.

We partner with the Federal Highway Administration (FHWA) or the Federal Transit Administration on a PEL study. Refer to the FHWA PEL web page for more information.

Contact WSDOT’s NEPA/SEPA Program Manager to discuss a strategy for documenting environmental issues in a PEL study.