Wailuku River At Piihonoua Flow Report
As of August 11, 2026, Wailuku River At Piihonoua is flowing at 436 cfs with a gage height of 5.15 ft, receding 19% over the past 24 hours. Source: USGS gauge #16704000, refreshed throughout the day.
Historical Data
Wailuku River At Piihonoua at a glance
How Wailuku River At Piihonoua is running right now, where it sits on the map, and the key gauge stats.
Wailuku River At Piihonoua is flowing at 436 cfs, with the water sitting 5.15 ft at the gage. Flow is down 19% since yesterday as the gauge recedes.
This is USGS gauge #16704000 in Hawaii. Over the past 10 days the average has been 137 cfs, peaking at 543 cfs.
For real-time updates and historical context, see the realtime view or the historical comparison. Browse other gauges in the Hawaii flow report.
Engineering Data
Flow-duration statistics and observed peak-flow context computed from this gauge’s complete daily record (USGS #16704000).
Estimate flows at an ungauged site
Drainage-area ratio transfer from this gauge . Most reliable for hydrologically similar sites in the same watershed with area ratios between roughly 0.5 and 1.5.
Percentiles are flow-duration values computed from this gauge’s observed daily record as archived by Snoflo. Return periods are Weibull plotting-position estimates from observed annual maxima, provided as general reference context only. Always verify against official USGS NWIS records. Part of Snoflo for Engineering.
Streamflow Forecast
Over the next 5 days, Wailuku River At Piihonoua is expected to recede from today's 543 cfs, toward roughly 278 cfs by 2026-08-14 (likely range 70-1107 cfs) -- about normal for the date.
Powered by PULSE — Snoflo’s forecast engine, trained on this gauge’s full record of storms, snowmelt, and dry spells.
| Date | Expected (p50) | Likely range (p25–p75) | vs normal | Projected stage |
|---|
How does this compare to past years?
Year-over-year overlay, annual peak discharge, the full distribution of daily flows on record, and the gauge's rating curve.
Weather Forecast
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day forecast
Daily temperatures, snow, and rain projected over the next two weeks.
Wailuku River At Piihonoua
It flows through the Wailuku River State Park and is a popular tourist destination for its scenic waterfalls and pools. The river's flow is affected by seasonal rainfall, with peak flows occurring during the wet season from November to March. The river has several tributaries, including Kamaole Stream and Waikapu Stream. Interesting facts about the hydrology of the Wailuku River include its significance in Hawaiian mythology and the river's role in providing water for the sugar cane industry on Maui.
Nearby streamflow levels
Cross-check Wailuku River At Piihonoua's discharge against nearby gauges to spot whether the change here is local or regional.
| Gauge | Streamflow |
|---|---|
| Wailuku River At Piihonoua | 436 cfs |
| Honolii Stream Near Papaikou | 179 cfs |
| Waikoloa Stream At Marine Dam Near Kamuela | 3 cfs |
| Paauau Gulch At Pahala | 0 cfs |
| Kohakohau Stream Above Dws Intake | 1 cfs |
| Alakahi Stream Near Kamuela | 23 cfs |
Plan a trip
Reservoirs, boat launches, river runs, and fishing spots within driving distance of Wailuku River At Piihonoua.
River levels & flood safety
- Read the level before you go
- A river that's runnable at one flow can be deadly at another. Check current discharge and gage height — like the values shown above — against the flood-stage thresholds, and remember levels can spike fast after rain or a dam release.
- Respect cold water
- Snowmelt rivers run cold even in summer. Sudden immersion triggers cold-water shock and saps strength within minutes. Wear a PFD, dress for the water temperature (not the air), and never wade or paddle alone.
- Watch for swiftwater hazards
- Strainers (downed trees), undercut rocks, and low-head dams are the deadliest features on moving water. High, fast, muddy water hides them. If in doubt, scout from shore and portage.
- Mind flash floods & releases
- Narrow canyons can flood from a storm miles upstream, and dam-controlled reaches can rise without warning. Know the forecast, the release schedule, and your exit before you launch.
Track Wailuku River At Piihonoua in the Snoflo app
Save this gauge as a favorite, set push alerts when streamflow crosses a threshold (e.g. "alert me when Wailuku River At Piihonoua crosses 5,000 cfs"), and Snoflo's iOS app will push the moment USGS reports the crossing.
About Wailuku River At Piihonoua
What is the Wailuku River At Piihonoua flow rate right now?
As of August 11, 2026, Wailuku River At Piihonoua is flowing at 436 cfs. The live value, gage height, and 24-hour trend are shown at the top of this page.
Is the Wailuku River At Piihonoua running high or low right now?
Check the percent of median figure on this page: above 100% means Wailuku River At Piihonoua is running higher than normal for the date, below 100% means lower. The 24-hour trend shows whether it's rising or falling.
Where does the streamflow data for Wailuku River At Piihonoua come from?
Discharge, gage height, and water temperature come directly from the USGS streamflow gauge 16704000. Snoflo refreshes the time series throughout the day. Forecasts come from the NOAA / yr.no feed Snoflo's iOS app uses.
How often is the report updated?
USGS gauges report continuously (typically every 15 minutes). Snoflo pulls fresh values throughout the day — look for the "as of" timestamp on the streamflow hero card.
What's the difference between discharge and gage height?
Discharge (cubic feet per second, or cfs) is the volume of water flowing past the gauge each second. Gage height is how high the water sits at the gauge (feet). They're related by a rating curve specific to each gauge — higher water means more flow, but the exact ratio depends on channel shape.
How is "percent of median" calculated?
Today's discharge is compared to the historical median discharge on this calendar day across the gauge's full record. 100% = right on median; 200% = a very high year; 30% = a drought-level low.
What are flood stages, and is this river safe right now?
Flood stages are NWS-defined gage-height thresholds — Action, Minor, Moderate, Major — marking when nearby roads or floodplains start to be affected. "Safe" depends on your activity and skill: a level that's a fun paddle for an expert can be lethal for a wader. Always check the current level against the thresholds above and the safety links, and when in doubt, stay off the water.
Can I get alerts when Wailuku River At Piihonoua rises?
Yes — flow alerts are managed in the Snoflo iOS app. Favorite this gauge, set a streamflow threshold (e.g. "alert me when discharge crosses 5,000 cfs"), and you'll get a push the moment USGS reports the crossing.
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Get the free Wailuku River At Piihonoua report — flow alerts, favorites, and history & forecasts, plus the free iPhone app.