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Regional Guidance for Walla Walla Regulatory Division

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 Liquefied Natural Gas Projects (LNG) 

In order to ensure that proposed liquefied natural gas (LNG) projects are being reviewed consistently and in accordance with reference documents and other laws and regulations, as applicable, Headquarters U.S. Army Corps of Engineers has developed regulatory standard operating procedures for processing LNG projects (see full text for details). 


 RGL 07-02: Exemption for Irrigation, Construction, Maintenance

This RGL addresses statutory exemptions for both irrigation and drainage ditches.  The following terms are defined for purposes of Subsection 404(f): irrigation ditch, drainage ditch, construction, and maintenance. This document also provides a framework for determining the applicability of the exemptions and the recapture provision. (See Figure 1).  While providing greater clarity, both the framework and the definitions are consistent with the agencies’ current practice in interpreting the Section 404(f) exemption.

RGL 07-02 supercedes RGL 87-07, which addresses the Section 404(f)(1)(C) Statutory Exemption for Drainage Ditch Maintenance.


 Bioengineering Techniques for State of Idaho
Bioengineering is the combination of biological, mechanical, and ecological concepts to control erosion and stabilize soil through the use of vegetation or a combination of vegetation and construction materials.

Willow Clump Plantings:  a streambank soil bioengineering technique used when large stands of willows are available in the project area; results are a shorter establishment period, lower rate of failure and faster protection of site

Streambank Bioengineering Guide:  a publication written to provide guidance for streambank bioengineering, increasing awareness of streams and riparian areas, their importance and their interconnectedness with other resources


 Regulatory Guidance Letters (RGLs)
Regulatory Guidance Letters (RGLs) were developed by the Corps as a system to organize and track written guidance issued to its field agencies.  RGL’s are normally issued as a result of evolving policy; judicial decisions and changes to the Corps regulations or another agency’s regulations which affect the permit program.  RGL’s are used only to interpret or clarify existing Regulatory Program policy, but do provide mandatory guidance to the Corps district offices.

RGL’s are sequentially numbered and expire on a specified date.  However, unless superseded by specific provisions of subsequently issued regulations or RGL’s, the guidance provided in RGL’s generally remains valid after the expiration date.  The Corps incorporates most of the guidance provided by RGL’s whenever it revises its permit regulations.