HAWAII FLOW REPORT
Last Updated: December 29, 2025
In Hawaii, particularly near Lihue, river enthusiasts and water resource managers are observing a significant change in the streamflow of the South Fork Wailua River. Current measurements indicate a streamflow of 116 cubic feet per second (cfs), which represents a substantial increase of 49.29 cfs in the last 24 hours alone. This rapid rise in water level has resulted in a current gage height of 3.27 feet. However, it is essential to note that despite this sharp increase, the streamflow is still below the seasonal norm by 21.22 percent, indicating that the river is not at its typical capacity for this time of year.
This data suggests that the South Fork Wailua River, which is key for activities such as freshwater fishing and potential whitewater trails, is experiencing volatility that could impact both recreational use and aquatic ecosystems. The area near Lihue, a city on the island of Kauai, should be monitored for possible implications of these changes. While the current increase does not yet signal flooding, the significant rise in the last day could be an early indicator of such an event if such trends continue. Therefore, it is advisable for river users and local residents to stay informed about further streamflow changes that may affect not only the Wailua River but also connected waterways and watersheds.
Hawaii's hydrology is characterized by limited surface water due to high evapotranspiration rates and steep topography. Major surface flows include the Wailuku, Wailoa, and Kailua streams on the island of Hawaii, and the Hanalei and Wailua rivers on Kauai. The state has several reservoirs and dams, with the largest being the Kaloko Reservoir on Kauai. Hawaii's climate is tropical, with rainfall varying greatly across the islands and between seasons. The leeward sides of the islands are generally dry, while the windward sides receive more moisture. Watershed health is crucial to maintain water quality and quantity, with some watersheds experiencing degradation due to land use changes and invasive species. Snowpack is not relevant to hydrology in Hawaii due to its location in the tropics.