The Hanapepe River Flood Control Project (FCP) is located on the southern coast of the island of Kauai and flows through the town of Hanapepe into Hanapepe Bay. The project was authorized by the 1944 Flood Act. The local sponsor, County of Kauai (County), operates and maintains the project.  The project is in the operations and maintenance phase.

The U.S. Army Corps of Engineers (Corps) completed improvements to the left and right banks in 1959 and 1963, respectively, and additional improvements to raise the height of the levees and construct the floodwalls were completed in 1966. 

The project consists of a floodwall atop a levee (2,200 feet long) and an I-Wall (185 feet long) on the left bank commencing at the new Kauai Belt Highway Bridge located about 0.4 mile above the river mouth, extending to the cliffs at the northeast corner of the town of Hanapepe; and riprap-lined earthen-filled levee (4,465 feet long) on the right bank commencing at the old highway bridge about 0.5 mile above the river mouth and extending upstream to high ground.

The Hanapepe River FCP reduces flood risk for approximately 859 commercial buildings and homes. To date, the project has prevented more than $23.7 million in projected damages, within the project area.

The project was turned over to the local sponsor upon construction completion to operate and maintain.  The Corps conducts annual inspections with the local sponsor to ensure the project is performing as intended.