The RMC supports interagency and international organizations and projects. The primary organizations that the RMC supports or coordinates with are:
- Department of State
- Bureau of Reclamation
- National Oceanic and Atmospheric Administration
- Tennessee Valley Authority
- Federal Energy Regulatory Commission
- Rijkswaterstaat (the Netherlands)
- Environment Agency (UK)
- The World Bank
The RMC supports these organizations primarily through training, peer review, technical support, and supporting joint efforts.