Several types of levees are present in the Portland District:
- Levees built, operated and maintained by the federal government;
- Levees built by the federal government and then turned over for operation and maintenance by a local sponsor;
- Levees constructed by a non-federal entity and are enrolled in the Corps' Rehabilitation and Inspection Program; and
- Levees that were neither built by the federal government nor are part of federal operations or maintenance programs.