HAWAII FLOW REPORT
Last Updated: January 7, 2026
In Hawaii, recent streamflow data reveals significant variations across the state, which are of interest to river enthusiasts and water resource managers. The Wailuku River, with a current streamflow of 1160 cubic feet per second (cfs) and a gage height of 7.41 feet, is flowing at nearly twice its normal volume, suggesting the potential for flooding if this trend continues. Conversely, the Waimea River near Waimea is experiencing a lower than average streamflow at only 28.41 percent of normal, with a current streamflow of 362 cfs, indicating a flow drought that could impact local ecosystems and water supplies. The Hanalei River near Hanalei is exceptionally high, at 491.06 percent of normal, with a significant 24-hour streamflow increase of 92 cfs, which has brought the current streamflow to 1440 cfs. This river's current conditions could have consequences for the nearby communities and the popularity of water activities in the area.
Among the other notable rivers, the South Fork of the Wailua River near Lihue shows an unusual 24-hour increase of 193.38 cfs, with the current streamflow at 399 cfs and 130.76 percent of normal, which may affect local whitewater trails and raise concerns for nearby Lihue. The Honolii Stream near Papaikou and the Wainiha River near Hanalei, while experiencing a decrease in streamflow over the past day, still maintain flows above normal, suggesting that water enthusiasts should remain vigilant for variable conditions. Overall, the state's rivers exhibit a dynamic range of flow conditions, from potential flooding to flow droughts, which could have implications for recreational activities, water resources management, and community safety.
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.