Conditional Letter of Map Revision (CLOMR)

Overview

The Marin County Flood Control and Water Conservation District submitted an application to the Federal Emergency Management Agency (FEMA) for a Conditional Letter of Map Revision (CLOMR) in late July 2025. The purpose of the CLOMR application is for FEMA to review the analysis of the potential impacts related to the removal of Building Bridge 2 (BB2) in downtown San Anselmo.

The FEMA process is expected to take approximately six months. FEMA’s review of the CLOMR applications does not represent an approval of the project. This is a regulatory requirement that allows FEMA to evaluate whether changes to flood hazard boundaries or flood insurance requirements should be made due to proposed construction projects along waterways.

Read the CLOMR Application

• MT-2 Application: Main application
• Appendix A Part A BB2: Removal Design Plans
• Appendix A Part B: Creek Park Design Plans
• Appendix B: Impact Assessment and Mitigation
• Appendices C through E:
  • Appendix C: Ross Valley Flow Reduction Study
  • Appendix D - Page 187: Dept. of the Interior/NOAA Comments
  • Appendix E - Page 203: Public Notification Documentation
• MT-2 Application Forms: Application Forms & Comments from Towns of Ross and San Anselmo
• Working Topographic Map (CAD DWG)
• HEC-RAS Model Files
  • Note: The two files directly above (CAD DWG & HEC-RAS) require specific software to open and review. FEMA has the specialized software and trained staff to review this data. The District is posting all files in our effort to be transparent.

Your Feedback on the CLOMR Application is Welcome

The District is inviting the public and business representatives to review the application and submit comments. Please email comments to the District. The District staff will forward CLOMR application comments to the local floodplain managers, which are the towns of San Anselmo and Ross, along with FEMA.