Portland, Oregon
Wetland consultant for Portland and the metro area
Wetland delineations, natural resource assessments, DSL and Corps permits, and mitigation for projects in Portland, Washington County, and Clackamas County.
Portland wetland consultant
Wetland work that fits metro-area rules
In the Portland area, wetlands and streams are regulated by Oregon DSL and the U.S. Army Corps of Engineers, and also by local rules that vary by city and county. Projects often need natural resource information before a land use or building permit can be issued.
Zion Natural Resources Consulting delineates wetlands and waters, maps them with sub-meter GPS in ArcGIS Pro, and prepares the reports, assessments, and permit applications those reviews ask for.
Local reviews
Common metro-area requirements
City of Portland ezones
Portland's environmental overlay zones, the conservation (c) and protection (p) zones in Zoning Code Chapter 33.430, protect streams, wetlands, and forests. Development in an ezone can require an environmental review with resource documentation.
Clean Water Services
In much of Washington County, including Beaverton, Hillsboro, Tigard, Tualatin, and Sherwood, projects near sensitive areas need a Clean Water Services Service Provider Letter, supported by a natural resource assessment and Vegetated Corridor mapping.
DSL and the Corps
Fill or removal in wetlands and waters needs state removal-fill authorization and often a Corps Section 404 permit. We prepare delineations for DSL concurrence and the joint permit application.
Services in Portland
What we do for metro-area projects
- Wetland delineations and determinations
- DSL removal-fill and Corps Section 404 permit applications
- Sub-meter GIS surveying and ArcGIS Pro mapping
- ORWAP, HGM, and SFAM functional assessments
- Wetland mitigation plans, monitoring, and banking
- Floodplain habitat mitigation assessments
- Local Wetland Inventories and riparian assessments
- Biological assessments, Essential Fish Habitat, and wildlife surveys
Nearby
Communities across the metro area
- Portland
- Gresham
- Troutdale
- Fairview
- Beaverton
- Hillsboro
- Tigard
- Tualatin
- Sherwood
- Forest Grove
- Cornelius
- Lake Oswego
- West Linn
- Oregon City
- Milwaukie
- Happy Valley
- Wilsonville
- Canby
Questions
Portland wetland questions
My Portland lot is in an environmental zone. What do I need?
It depends on the zone and what you plan to build. Many projects in a c or p zone need resource information, such as a wetland or stream delineation, to support the city's environmental review. We can map the resources on your site so your designer knows where the limits are.
What is a Service Provider Letter?
In much of Washington County, Clean Water Services issues a Service Provider Letter before site development, erosion control, or building permits. If sensitive areas are on or near your site, the letter is supported by a natural resource assessment that we can prepare.
Do you work outside Portland city limits?
Yes. We work throughout Multnomah, Washington, and Clackamas counties and across Oregon.