Hawaii River Levels & Streamflow
As of Sep 5, 2026, Hawaii rivers are running at 210% of normal across 47 USGS gauges — the highest is 229 cfs on the Wailuku River At Piihonoua. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Hawaii.
Streamflow levels across Hawaii are currently 210% of normal, with the Wailuku River At Piihonoua reporting the highest discharge in the state at 229 cfs and a gauge stage of 4.07 ft.
Meanwhile, the Wailuku River At Piihonoua is seeing a spike today — up -52% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Hawaii's named rivers.
Active weather warnings for Hawaii
Hawaii is under a High Surf Advisory through Sunday evening, September 6, with dangerous surf conditions affecting all islands. Swells from Hurricane Lowell will generate 12-14 foot waves along south and east-facing shores, with 8-foot surf along the Big Island's west-facing shores. A secondary east swell from Hurricane Karina will compound conditions through Sunday. Strong breaking waves and currents pose serious swimming hazards across affected coastlines. Residents and visitors in coastal communities statewide—including Honolulu, Hilo, and Maui—should avoid ocean activities and exercise extreme caution near shorelines. Conditions may escalate to warning levels by Monday as Hurricane Lowell turns northward.
State-wide streamflow overview
The Hawaii flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.
Percent of normal
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Gauge stage 4.07 ft
Biggest 24h spike
Now 229 cfs
Network coverage
USGS gauges feeding 0 named rivers in Hawaii.
Where every gauge actually sits
One dot per Hawaii streamgauge, placed by its own percent of normal. The state average is a single line through all of it.
Percent of normal compares today's discharge with the historical average for this calendar day. Tap any dot to open that gauge.
Hawaii streamflow, three water years
Statewide percent of normal, every day since Sep 2023. The dotted line is normal.
799 daily readings from 46 reporting gauges. Percent of normal is today's statewide discharge against the historical average for the same calendar day — 100% is normal, not "good". The axis tops out at 250%: 78 readings above that — including the 7489% peak in Aug 2026 — are drawn along the top edge, so a few flood days cannot flatten three years of everything else. The line breaks in 2 places where the record skips more than five days — those are gaps in reporting, not readings of zero.
Hawaii USGS streamgauges
Every USGS gauge Snoflo tracks in Hawaii. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Wailuku River At Piihonoua, Hi
1 day ago · USGS 16704000 |
173 cfs | 3.68 ft | · | 67°F | 1,084 ft | Hawaii |
|
Hanalei River Nr Hanalei, Hi
1 day ago · USGS 16103000 |
122 cfs | · | · | 72°F | 74 ft | Kauai |
|
Honokohau Stream Near Honokohau, Hi
1 day ago · USGS 16620000 |
101 cfs | 2.63 ft | · | 67°F | 886 ft | Maui |
|
Honolii Stream Nr Papaikou, Hi
1 day ago · USGS 16717000 |
89 cfs | 3.06 ft | · | 67°F | 1,557 ft | Hawaii |
|
Waihee River At Dam Near Waihee, Hi
1 day ago · USGS 16614000 |
75 cfs | 1.88 ft | · | 69°F | 606 ft | Maui |
|
Wainiha River Nr Hanalei, Hi
1 day ago · USGS 16108000 |
72 cfs | 2.84 ft | · | 66°F | 990 ft | Kauai |
|
Waimea River Nr Waimea, Hi
1 day ago · USGS 16031000 |
58 cfs | 6.62 ft | · | 71°F | 15 ft | Kauai |
|
Sf Wailua River Nr Lihue, Hi
1 day ago · USGS 16060000 |
57 cfs | 2.63 ft | · | 73°F | 251 ft | Kauai |
|
Iao Stream At Kepaniwai Park Nr Wailuku, Hi
1 day ago · USGS 16604500 |
56 cfs | 1.12 ft | · | 62°F | 797 ft | Maui |
|
Waiahole Stream Above Kamehameha Hwy, Hi
1 day ago · USGS 16294100 |
42 cfs | 9.02 ft | · | 75°F | 15 ft | Oahu |
|
West Wailuaiki Stream Near Keanae, Hi
1 day ago · USGS 16518000 |
40 cfs | 2.25 ft | · | 68°F | 1,376 ft | Maui |
|
Waikele Str At Waipahu, Hi
1 day ago · USGS 16213000 |
31 cfs | 2.21 ft | 77°F | 74°F | 23 ft | Oahu |
|
Eb Of Nf Wailua River Nr Lihue, Hi
1 day ago · USGS 16068000 |
29 cfs | · | · | 72°F | 500 ft | Kauai |
|
Kahana Str At Alt 30 Ft Nr Kahana, Hi
1 day ago · USGS 16296500 |
28 cfs | 4.62 ft | · | 75°F | 29 ft | Oahu |
|
Hanawi Stream Near Nahiku, Hi
1 day ago · USGS 16508000 |
26 cfs | 1.29 ft | · | 67°F | 1,322 ft | Maui |
|
Kamananui Str At Maunawai, Hi
1 day ago · USGS 16330000 |
23 cfs | 2.60 ft | · | 72°F | 18 ft | Oahu |
|
Kahakuloa Stream Near Honokohau, Hi
1 day ago · USGS 16618000 |
22 cfs | · | 70°F | 72°F | 359 ft | Maui |
|
Sf Kaukonahua Str At E Pump, Hi
1 day ago · USGS 16208000 |
20 cfs | 1.81 ft | · | 70°F | 882 ft | Oahu |
|
Manoa-Palolo Drainage Canal At Moiliili, Hi
1 day ago · USGS 16247100 |
18 cfs | 1.02 ft | · | 76°F | 1 ft | Oahu |
|
Kawaikoi Stream Nr Waimea, Hi
1 day ago · USGS 16010000 |
14 cfs | 2.39 ft | · | 62°F | 3,422 ft | Kauai |
|
Kamananui Str At Pupukea Mil Rd, Hi
1 day ago · USGS 16325000 |
14 cfs | 1.27 ft | · | 70°F | 615 ft | Oahu |
|
Kawainui Stream Nr Kamuela, Hi
1 day ago · USGS 16720000 |
13 cfs | 1.73 ft | · | 60°F | 4,073 ft | Hawaii |
|
Honopou Stream Near Huelo, Hi
1 day ago · USGS 16587000 |
13 cfs | 1.28 ft | · | 70°F | 1,207 ft | Maui |
|
Halawa Stream Near Halawa, Hi
1 day ago · USGS 16400000 |
13 cfs | 2.10 ft | · | 69°F | 258 ft | Molokai |
|
Oheo Gulch At Dam Near Kipahulu, Hi
1 day ago · USGS 16501200 |
11 cfs | · | · | 74°F | 431 ft | Maui |
|
Alakahi Stream Near Kamuela, Hi
1 day ago · USGS 16725000 |
9 cfs | 2.27 ft | · | 63°F | 3,897 ft | Hawaii |
|
Nf Kaukonahua Str Abv Rb, Hi
1 day ago · USGS 16200000 |
9 cfs | 1.92 ft | · | 69°F | 1,233 ft | Oahu |
|
Waihee Str Nr Kahaluu, Hi
1 day ago · USGS 16284200 |
8 cfs | 2.92 ft | · | 71°F | 175 ft | Oahu |
|
Opaeula Str Nr Wahiawa, Hi
1 day ago · USGS 16345000 |
8 cfs | 1.94 ft | · | 70°F | 1,160 ft | Oahu |
|
Waikane Str At Alt 75 Ft At Waikane, Hi
1 day ago · USGS 16294900 |
7 cfs | 3.07 ft | · | 75°F | 100 ft | Oahu |
|
Waiakeakua Str At Honolulu, Hi
1 day ago · USGS 16240500 |
6 cfs | · | · | 72°F | 277 ft | Oahu |
|
Kalihi Str Nr Honolulu, Hi
1 day ago · USGS 16229000 |
6 cfs | 2.41 ft | · | 73°F | 490 ft | Oahu |
|
Waialae Str At Alt 3, Hi
1 day ago · USGS 16019000 |
6 cfs | 1.03 ft | · | 60°F | 3,857 ft | Kauai |
|
Waimanalo Str At Waimanalo, Hi
1 day ago · USGS 16249000 |
6 cfs | 7.11 ft | · | 76°F | 20 ft | Oahu |
|
Halaulani Str At Alt 400 Ft Nr Kilauea, Hi
1 day ago · USGS 16097500 |
5 cfs | · | · | 72°F | 405 ft | Kauai |
|
Makawao Str Nr Kailua, Hi
1 day ago · USGS 16254000 |
5 cfs | 6.96 ft | · | 75°F | 79 ft | Oahu |
|
Kahaluu Str Nr Ahuimanu, Hi
1 day ago · USGS 16283200 |
4 cfs | 1.33 ft | · | 74°F | 145 ft | Oahu |
|
Waihi Stream At Honolulu, Hi
1 day ago · USGS 16238500 |
3 cfs | 1.89 ft | 74°F | 72°F | 291 ft | Oahu |
|
N. Halawa Str Nr Honolulu, Hi
1 day ago · USGS 16226200 |
3 cfs | 6.53 ft | · | 76°F | 163 ft | Oahu |
|
N. Halawa Str Nr Quar. Stn. At Halawa, Hi
1 day ago · USGS 16226400 |
3 cfs | 3.01 ft | · | 75°F | 66 ft | Oahu |
|
Haiku Str Nr Heeia, Hi
1 day ago · USGS 16275000 |
2 cfs | 1.18 ft | · | 73°F | 273 ft | Oahu |
|
Left Branch Opaekaa Str Nr Kapaa, Hi
1 day ago · USGS 16071500 |
1 cfs | · | · | 73°F | 473 ft | Kauai |
|
Moanalua Stream Nr Kaneohe, Hi
1 day ago · USGS 16227500 |
1 cfs | 2.54 ft | · | 73°F | 662 ft | Oahu |
|
Pukele Stream Near Honolulu, Hi
1 day ago · USGS 16244000 |
1 cfs | · | 76°F | 74°F | 364 ft | Oahu |
|
Makaha Str Nr Makaha, Hi
1 day ago · USGS 16211600 |
0 cfs | 1.29 ft | · | 70°F | 944 ft | Oahu |
|
Waikamoi Str Ab Res At Kula Pl Intake Nr Olinda, Hi
1 day ago · USGS 16552800 |
0 cfs | · | · | 55°F | 4,471 ft | Maui |
|
Kaunakakai Gulch At Altitude 75 Feet, Hi
1 day ago · USGS 16414200 |
0 cfs | 4.90 ft | · | 75°F | 88 ft | Molokai |
See every Hawaii gauge ranked against normal.
- Percentile rank & % of median for all 47 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
About Hawaii streamflow
What are river levels like in Hawaii right now?
As of September 5, 2026, Hawaii rivers are running at 210% of normal across 47 USGS streamgauges, and the Wailuku River At Piihonoua is reporting the highest discharge at 229 cfs. The full sortable gauge table is below.
Which Hawaii river is running highest right now?
As of September 5, 2026, the highest discharge in Hawaii is 229 cfs on the Wailuku River At Piihonoua. See the sortable gauge table for the full statewide ranking.
Are Hawaii rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means Hawaii rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.
Where does the Hawaii streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the Hawaii data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a Hawaii gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.
Streamflow in every state
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