Environmental research and monitoring reports completed by the Washington State Department of Transportation (WSDOT) fulfill permit requirements and document our ongoing efforts to improve the environmental performance of our statewide transportation system.

Find information on how to complete monitoring reports for specific disciplines from the Environmental disciplines page.

Use the following links to find reports by topic:

Cultural resources provides videos, project webpages, information centers, and publications that demonstrate the results of creative mitigation and notable historical resources describing the history of Washington’s Transportation system.

Fish & Wildlife features research on the effects of transportation infrastructure on wildlife movement

• Statewide habitat connectivity analysis
• Ranking the suitability of existing bridges and culberts for providing wildlife passage
• Landscape permeability for large carnivores
• Wildlife crossings and collision analysis
• Tracking wildlife carcasses removed by maintenance describes WSDOT's wildlife carcass removal database.

Noise includes reports on underwater noise and pile driving, as well as information about WSDOT's quieter pavement research. 

Water resources & erosion control reports are available on

• Stormwater research
• Municipal Stormwater Permit Reports
• Construction Stormwater Permit Reports

Wetland monitoring reports document the development of individual wetland mitigation sites for federal, state, and local permit compliance.

Project Environmental Mitigation Costs (pdf 3.5 mb) reports the costs associated with environmental mitigation on WSDOT projects.