Wahiawa Reservoir at Spillway at Wahiawa, Oahu water level

Name: Wahiawa Reservoir at Spillway at Wahiawa, Oahu water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Reservoir, Wahiawa Reservoir, Hawaii, United States

Directions

Very low for mid-October

Water level

55.73ft Up 0.54 ft over the last 24 hours

Measured Oct 20, 2026, 07:35 PM HST (1 hour ago)

History

202120222023202420252026

Water level Normal range (10–90 %) Minor flood stage

What this means

Water is short at Wahiawa Reservoir at Spillway at Wahiawa, Oahu: the latest reading of 55.73 ft is far below normal for mid-October.

That puts it 7.34 ft below the median of 63.07 ft for mid-October, based on 7 years of readings. It is 28.27 ft below the flood stage of 84.00 ft. A year ago it stood at 60.05 ft (−4.32 ft).

It is on the way up, by 0.54 ft over the past 24 hours. The 30-day range is 46.03 ft – 60.35 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 7 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 63.07 ft7.34 ft below the median for this date
Normal for this date: 58.51 ft – 65.90 ft8 years in 10 fall in this range (7 years of records)
Same day last year: 60.05 ft−4.32 ft
Lowest and highest in 30 days: 46.03 ft – 60.35 ft
Lowest and highest in 12 months: 45.91 ft – 82.96 ft

Boating and fishing at Wahiawa Reservoir at Spillway at Wahiawa, Oahu

At low levels, launching can mean a long walk or a closed ramp, and shallow points stick out further than charts suggest.

Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.

What happens at each level

84.00 ft: Kaukonahua Stream will overflow at Otake Camp in Waialua.
55.73 ft: Right now

Impact statements from the U.S. National Weather Service.

Weather at the gauge

Rain in the last 3 days: 0.32 in.

20 Tue 79° 68° 0.12 in, 93% Wind 13 mph

21 Wed 79° 65° 0.02 in, 57% Wind 11 mph

22 Thu 79° 63° 0.02 in, 55% Wind 7 mph

23 Fri 80° 63° – Wind 8 mph

24 Sat 81° 64° – Wind 7 mph

25 Sun 75° 65° 0.05 in, 47% Wind 7 mph

26 Mon 82° 64° 0.06 in, 30% Wind 5 mph

Forecast: Open-Meteo

Sunrise 06:31 AM Sunset 06:04 PM Daylight 11 hr, 33 min Waxing gibbous 75%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Kaukonahua Stream below Wahiawa Reservoir, OahuRiver gauge, Kaukonahua Stream	51.3 cfs	Normal	+18.9 cfs	0.3 mi
Wahiawa Ditch at Wahiawa, OahuCanal gauge, Wahiawa Ditch	10.4 cfs	Normal	+0.6 cfs	0.3 mi
Upper Helemano Reservoir near Wahiawa, OahuReservoir, Upper Helemano Reservoir	42.78 ft	Very high	−0.07 ft	2.5 mi
SF Kaukonahua Str at E pump, near Wahiawa, OahuRiver gauge, SF Kaukonahua Str	1.80 ft	Below flood stage	−0.13 ft	3.5 mi
Helemano 6 Reservoir, OahuReservoir	22.33 ft	Low	−0.53 ft	4.0 mi
Ku Tree Reservoir near Wahiawa, OahuReservoir, Ku Tree Reservoir	17.19 ft	Low	±0	4.4 mi
Koolau Reservoir near Wahiawa, OahuReservoir, Koolau Reservoir	6.72 ft	Very high	+0.20 ft	5.1 mi
Kemoo 5 Reservoir, OahuReservoir	14.66 ft	Normal	+0.04 ft	5.4 mi

Questions and answers

How does Wahiawa Reservoir at Spillway at Wahiawa, Oahu compare with last year?

It is 4.32 ft lower than on the same day last year, when the reading was 60.05 ft.

What is a normal level for Wahiawa Reservoir at Spillway at Wahiawa, Oahu in mid-October?

The median for mid-October is 63.07 ft. In 8 years out of 10 the reading falls between 58.51 ft and 65.90 ft, based on 7 years of records.

What is the water level of Wahiawa Reservoir at Spillway at Wahiawa, Oahu today?

On Oct 20, 2026, 07:35 PM HST, the water level was 55.73 ft. Up 0.54 ft over the last 24 hours.

Is Wahiawa Reservoir at Spillway at Wahiawa, Oahu rising or falling?

Up 0.54 ft over the last 24 hours. Up 1.66 ft over the last 7 days.

Is the level of Wahiawa Reservoir at Spillway at Wahiawa, Oahu normal?

Very low for mid-October. Compared with 7 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:16210000 (Agency page)
Coordinates: 21.49647, -158.04978 (WGS84)
Vertical datum: LMSL
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	55.73 ft	2026-10-21 05:35	Provisional

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How to cite

U.S. Geological Survey: Wahiawa Reservoir at Spillway at Wahiawa, Oahu (usgs:16210000). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/hawaii/wahiawa-reservoir-at-spillway-at-wahiawa-oahu

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer