HAWAII FLOW REPORT
Last Updated: December 24, 2025
In the state of Hawaii, recent streamflow data indicate significant variability across different river systems, which is of interest to river enthusiasts, environmentalists, and residents near these water bodies. The Oheo Gulch near Kipahulu has experienced a dramatic surge with a current streamflow of 144 cubic feet per second (cfs) and a massive increase of 15,057.89% in the last 24 hours, which is alarming as it is well below the average at only 17.91% of normal. This could suggest flood conditions in the region. Conversely, the Waimea River near Waimea is flowing at 187 cfs, a 61.21% increase from the previous day, but still 32.12% lower than typical, indicating potential flow drought conditions. Water enthusiasts and communities in Kipahulu and Waimea should be aware of these contrasting extremes that could affect recreational and daily activities.
On the East Branch of the North Fork Wailua River near Lihue, streamflow has slightly declined by 10.81%, with a flow of 132 cfs, yet it remains close to the seasonal norm at 9.75% above average. The gage height here is currently at 1.01 feet. Meanwhile, the Wainiha River near Hanalei shows a decrease of 52.1% in streamflow over the last day, with a current rate of 239 cfs, indicating a potential decrease in water availability for this region. However, the South Fork Wailua River near Lihue has a considerable flow of 601 cfs, a significant increase of 642.89% in the past 24 hours, and a gage height of 5.78 feet, which is 237.85% above normal and may raise concerns about flooding. These fluctuations are particularly important for residents and those who engage in whitewater activities as they significantly impact both safety conditions and river ecosystem health.
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.
Winter Storm Warnings
December 24 2025
Residents of Hawaii, particularly those with respiratory issues, are urged to take precautions due to recent volcanic activity from Kilauea Volcano. Lava fountaining has subsided and the ash plume has become undetectable, but the potential for wind to pick up lingering ash remains a concern. People in affected areas should minimize exposure to the ash, which can irritate eyes and respiratory systems. Currently, the ash dispersion is moving south to southeast, away from more populated areas. However, individuals in the vicinity of the Halemaumau Crater should remain vigilant and follow updates from local authorities for any changes in volcanic activity.