Wailuku River at Piihonoua, HI
River level and flood forecast · Hawaii County
The river is 17.3 ft below flood stage (20 ft).
Flow: 69 cubic feet per second (USGS).
Normal for October 27.
Usual for October 27: 31 to 172 cubic feet per second (the middle half of 97 years).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 1 PM. Forecasts change as rain falls and as upstream water arrives.
Flow against normal, the last 60 days
Each day's average flow from USGS. The shaded band is the middle half of past years on the same date (97 years); the dashed line is their median.
Get flood alerts for this river
An email when the National Weather Service forecasts Wailuku River at Piihonoua to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 24.4 ft |
| Flood stage | 20 ft |
What floods at each level
From the National Weather Service, highest first.
- 21 ftFlooding affecting homes and properties in Piihonua. Also an indirect indicator of Alenaio Stream in downtown Hilo at maximum capacity. Bayfront area flooding. Kamehameha Ave. and lower Pauahi St. closed. Other normally flood prone roads also closed.
Highest flow on record
82,300 cubic feet per second — August 24, 2018. From the USGS's yearly peaks since 1929.
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (WLUH1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.