HAWAII FLOW REPORT

Last Updated: December 19, 2025

Hawaii's river systems are currently exhibiting varied streamflow conditions that are significant for enthusiasts tracking seasonal flows and potential water-related events. On Oahu, the Waikele Stream at Waipahu is flowing at a robust 115 cubic feet per second (cfs), which is 62.08% above its normal rate, despite a 24-hour decrease of 20.69 cfs, suggesting a recent drop after a period of higher flows. Meanwhile, the Waimea River near Waimea on Kauai presents a contrasting scenario; it's currently at 295 cfs, a notable 24-hour decrease of 67.83 cfs, with the flow at 6.58% below what's considered normal, possibly indicating a localized flow drought or a return to average conditions after a surge. This could affect the Waimea community and potentially influence recreational river activities, which are dependent on sustained flow levels.

In the northern Kauai region, the Wainiha River near Hanalei, flowing at 178 cfs, and the South Fork Wailua River near Lihue, at 173 cfs, have also experienced significant 24-hour decreases in streamflow of 21.24 cfs and 46.6 cfs, respectively. The Wainiha River is currently 22.36% below its typical flow, whereas the South Fork Wailua River's flow is slightly above average at 10.85%. These changes in streamflow could impact the surrounding ecosystems and recreational areas, including popular whitewater trails frequented by kayakers and rafters. The current gage heights, 2.8 meters for Waikele, 7.53 for Waimea, 2.84 for Wainiha, and 3.65 for South Fork Wailua, should be carefully monitored as they play a critical role in assessing river navigability and the potential for flooding, especially in areas proximal to these waterways. The data indicates dynamic river conditions across Hawaii, with particular attention required for any sudden increases that may herald flooding, or further decreases suggesting prolonged flow reductions.