Upper Helemano Reservoir near Wahiawa, Oahu water level

Name: Upper Helemano Reservoir near 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, Upper Helemano Reservoir, Hawaii, United States

Directions

Very high for mid-October

Water level

43.01ft Down 0.24 ft over the last 24 hours

Measured Oct 16, 2026, 11:10 AM HST (1 hour ago)

History

What this means

There is plenty of water in Upper Helemano Reservoir near Wahiawa, Oahu: 43.01 ft, well above normal for mid-October.

The median for mid-October is 35.89 ft, based on 7 years of readings, so the lake level is 7.12 ft above typical.

The level is falling, down 0.24 ft over the past 24 hours. Over the past 30 days it has moved between 42.63 ft and 44.91 ft.

Many reservoirs reach their low point of the year in fall, before winter rain and snow start the refill.

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

Key numbers

Median for this date: 35.89 ft7.12 ft above the median for this date
Normal for this date: 35.88 ft – 40.36 ft8 years in 10 fall in this range (7 years of records)
Lowest and highest in 30 days: 42.63 ft – 44.91 ft
Lowest and highest in 12 months: 33.25 ft – 46.16 ft

Swimming and boating at Upper Helemano Reservoir near Wahiawa, Oahu

High water can flood ramps, parking areas and shoreline campsites, and it carries floating debris. Expect some no-wake zones to be extended.

If you swim, pick a spot with an easy way out, and remember that drop-offs move as the level changes.

Weather at the gauge

The forecast is not available right now.

Sunrise 06:29 AM Sunset 06:08 PM Daylight 11h 39m First quarter 34 %

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Wahiawa Ditch at Wahiawa, OahuCanal gauge, Wahiawa Ditch	8.7 cfs	Normal		2.3 mi
Kaukonahua Stream below Wahiawa Reservoir, OahuRiver gauge, Kaukonahua Stream	32.9 cfs	Normal		2.3 mi
Wahiawa Reservoir at Spillway at Wahiawa, OahuReservoir, Wahiawa Reservoir	53.45 ft	Very low	−0.28 ft	2.5 mi
Helemano 6 Reservoir, OahuReservoir	22.63 ft	Normal	−0.12 ft	3.0 mi
Opaeula Str near Wahiawa, OahuRiver gauge, Opaeula Str	1.94 ft	Below flood stage		3.1 mi
SF Kaukonahua Str at E pump, near Wahiawa, OahuRiver gauge, SF Kaukonahua Str	1.53 ft	Below flood stage		3.3 mi
Ku Tree Reservoir near Wahiawa, OahuReservoir, Ku Tree Reservoir	17.19 ft	Low	0.00 ft	3.6 mi
Koolau Reservoir near Wahiawa, OahuReservoir, Koolau Reservoir	6.14 ft	High	−0.02 ft	4.4 mi

Questions and answers

How often is Upper Helemano Reservoir near Wahiawa, Oahu updated?

Several times an hour. New readings from U.S. Geological Survey appear here as they arrive. Latest: Oct 16, 2026, 11:10 AM HST.

Is Upper Helemano Reservoir near Wahiawa, Oahu rising or falling?

It is falling, by 0.24 ft over the past 24 hours.

What is the water level of Upper Helemano Reservoir near Wahiawa, Oahu today?

On Oct 16, 2026, 11:10 AM HST, the water level was 43.01 ft. Down 0.24 ft over the last 24 hours.

Is Upper Helemano Reservoir near Wahiawa, Oahu rising or falling?

Down 0.24 ft over the last 24 hours. Up 0.38 ft over the last 7 days.

Is the level of Upper Helemano Reservoir near Wahiawa, Oahu normal?

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

How often is this data updated?

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 U.S. Geological Survey, the official operator of this gauge, and are published under 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:213133158014201 (Agency page)
Coordinates: 21.52591, -158.02842 (WGS84)
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 `stage`	43.01 ft	2026-10-16 21:10	Provisional

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How to cite

U.S. Geological Survey: Upper Helemano Reservoir near Wahiawa, Oahu (usgs:213133158014201). Accessed October 16, 2026 via Nivelmap, https://nivelmap.com/en/united-states/hawaii/upper-helemano-reservoir-near-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