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 However, unless superseded by specific provisions of subsequently issued regulations or RGL’s, the guidance provided in RGL’s generally remains valid after the expiration date.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.

• 2008
• 08-03 - Minimum Monitoring Requirements for Compensatory Mitigation Projects Involving the Restoration, Establishment, and/or Enhancement of Aquatic Resources
• 08-02 - Jurisdictional Determinations
• 08-01 - Guidance for Implementing the Silent Inspector (SI) System for Dredging Projects Requiring Department of the Army (DA) Permits
• 2007
• 07-04 - Emergency permit processing for Mosquito Control Ditching and/or Filling Activities Requiring Department of the Army (DA) permits under Section 404 of the Clean Water Act and/or Section 10 of the Rivers and Harbors Act (RHA)
• 07-03 - Department of the Army Permit Processing for Proposed Natural Gas Projects.
• 07-02 - Exemptions for Construction or Maintenance of Irrigation Ditches and Maintenance of Drainage Ditches Under Section 404 of Clean Water Act.
• 07-01 - Practices for Documenting Jurisdiction under Section 404 of the Clean Water Act (CWA) and Sections 9 & 10 of the Rivers and Harbors Act (RHA) of 1899.
• 2006
• 06-04 - Guidance for the Implementation of the Silent Inspector (SI) for Dredging Projects requiring Department of Army (DA) permits
• 06-03 - Minimum Monitoring Requirements for Compensatory Mitigation Projects Involving the Creation, Restoration, and/or Enhancement of Aquatic Resource
• 06-02 - Guidance on Dredged Material Testing for Purposes of Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act, and Section 103 of the Marine Protection, Research, and Sanctuaries Act of 1972
• 06-01 - Guidance for determining the timeliness of Requests for Appeal (RFA)
• 2005
• 05-09 - Guidance on Special Area Management Plans
• 05-08 - Guidance on Environmental Impact Statements -- Third Party Contracting
• 05-07 - Guidance on Approved NEPA Categorical Exclusions for Nationwide Permit 23
• 05-06 - Guidance on Expired Regulatory Guidance Letters
• 05-05 - Guidance on Ordinary High water mark Identification
• 05-04 - Guidance on the Discharge of Sediments From or Through a Dam and the Breaching of Dams
• 05-03 - Nationwide Permit Verifications and the Expiration of the 2002 Nationwide Permits and Future Nationwide Permits 
• 05-02 - Expiration of Geographic Jurisdictional Determinations of Waters of the United States
• 05-01 - Guidance on the Use of Financial Assurances, and Suggested Language for Special Conditions for Department of the Army Permits Requiring Performance Bonds.
• 2002
• 02-02 - Guidance on Compensatory Mitigation Projects for Aquatic Resource Impacts Under the Corps Regulatory Program Pursuant to Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899
• 02-01 - Inclusion of Disclaimer Statements in Jurisdictional Letters Indicating that The Clean Water Act (CWA) Jurisdictional Determinations/Delineations May Not Meet the Requirements of The Food Security Act (FSA) of 1985
• 2001
• 01-01 - Guidance for the Establishment and Maintenance of Compensatory Mitigation Projects Under the Corps Regulatory Program Pursuant to Section 404(a) of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899
• 1991 - 1996
• 1981 - 1986