Country: USA
United StatesCanadaUnited Kingdom

Upper Helemano Reservoir water level today

Lake in Honolulu County, Hawaii

42.23ft
12.87 m · gauge reading (local datum, not an elevation)
Measured · provisional
Normal for the dateFalling
24 hours
▼ 0.26 ft
7 days
▼ 0.81 ft
30 days
▼ 1.69 ft
Normal for Oct 23 ?
37.77 ft

At a glance · Oct 23

About normal

Upper Helemano Reservoir is 4.5 ft higher than normal for Oct 23, higher than on this date in 7 of the last 9 years, but still within its normal range.

  • This week↘ Falling 0.81 ft
  • Lowest on record↓ 25.19 ft (2013)

Compared with this gauge's own records for the same date. A statistical guide, not advice.

Normal for Oct 23Record lowToday42.23 ft

Today compared with past years on Oct 23

Lowest to highest on this date: 30.69–45.29 ftUsual range (10th–90th percentile): 33.60–44.68 ftNormal (25th–75th percentile): 35.89–42.92 ftToday: 42.23 ftToday 42.23 ftMedian 37.77Lowest 30.69Highest 45.2925th75th
Lowest to highest on this date: 30.69–45.29 ftUsual range (10th–90th percentile): 33.60–44.68 ftNormal (25th–75th percentile): 35.89–42.92 ftToday: 42.23 ftToday 42.23 ftMedian 37.77Lowest 30.69Highest 45.2925th75th

Where today's reading sits among this gauge's own records for the same date (±3 days). A statistical guide, not advice.

What this means

It is lower than on Oct 23 in 2 of the last 9 years.

The lake has fallen 0.81 ft in 7 days and fallen 1.69 ft in 30 days.

Since 2011, the lowest daily level was 25.19 ft (Sep 2013) and the highest 46.22 ft (Jan 2013).

Upper Helemano Reservoir level chart

Loading chart…

Measured Normal range for the date (middle 50% of past years)

2026 compared with 2025

2934384347JanFebMarAprMayJunJulAugSepOctNovDec202520262025-07-31: 41.17 ft2025-08-05: 40.38 ft2025-08-10: 39.46 ft2025-08-15: 38.19 ft2025-08-20: 36.79 ft2025-08-25: 35.90 ft2025-08-30: 35.91 ft2025-09-04: 35.91 ft2025-09-09: 35.90 ft2025-09-14: 35.90 ft2025-09-19: 35.90 ft2025-09-24: 35.91 ft2025-09-29: 35.91 ft2025-10-04: 35.91 ft2025-11-18: 35.90 ft2025-11-24: 34.67 ft2025-11-29: 34.35 ft2025-12-04: 33.45 ft2025-12-09: 33.80 ft2025-12-14: 33.55 ft2025-12-19: 38.40 ft2025-12-24: 40.53 ft2025-12-29: 41.17 ft2026-01-03: 42.39 ft2026-01-08: 44.86 ft2026-01-13: 44.32 ft2026-01-18: 43.87 ft2026-01-23: 43.13 ft2026-01-28: 42.68 ft2026-02-02: 41.95 ft2026-02-07: 41.19 ft2026-02-12: 45.04 ft2026-02-17: 44.86 ft2026-02-22: 45.41 ft2026-02-27: 44.86 ft2026-03-04: 44.14 ft2026-03-09: 44.84 ft2026-03-14: 45.53 ft2026-03-19: 44.56 ft2026-03-24: 45.17 ft2026-03-29: 44.57 ft2026-04-03: 43.61 ft2026-04-08: 43.80 ft2026-04-13: 43.31 ft2026-04-18: 43.00 ft2026-04-23: 42.48 ft2026-04-28: 42.22 ft2026-05-03: 41.42 ft2026-05-08: 40.46 ft2026-05-13: 40.29 ft2026-05-18: 43.14 ft2026-05-23: 43.25 ft2026-05-28: 42.53 ft2026-06-02: 42.55 ft2026-06-07: 43.51 ft2026-06-12: 43.37 ft2026-06-17: 42.44 ft2026-06-22: 41.08 ft2026-06-27: 39.81 ft2026-07-02: 38.74 ft2026-07-07: 37.73 ft2026-07-12: 36.27 ft2026-07-17: 35.43 ft2026-07-22: 35.37 ft2026-07-27: 35.10 ft2026-08-01: 36.44 ft2026-08-06: 37.06 ft2026-08-11: 36.64 ft2026-08-17: 38.57 ft2026-08-22: 40.41 ft2026-08-28: 40.83 ft2026-09-02: 40.96 ft2026-09-07: 43.10 ft2026-09-12: 44.91 ft2026-09-17: 44.63 ft2026-09-22: 44.14 ft2026-09-27: 43.24 ft2026-10-04: 43.32 ft2026-10-12: 43.72 ft2026-10-17: 42.82 ft
2934384347JanAprJulOct202520262025-07-31: 41.17 ft2025-08-05: 40.38 ft2025-08-10: 39.46 ft2025-08-15: 38.19 ft2025-08-20: 36.79 ft2025-08-25: 35.90 ft2025-08-30: 35.91 ft2025-09-04: 35.91 ft2025-09-09: 35.90 ft2025-09-14: 35.90 ft2025-09-19: 35.90 ft2025-09-24: 35.91 ft2025-09-29: 35.91 ft2025-10-04: 35.91 ft2025-11-18: 35.90 ft2025-11-24: 34.67 ft2025-11-29: 34.35 ft2025-12-04: 33.45 ft2025-12-09: 33.80 ft2025-12-14: 33.55 ft2025-12-19: 38.40 ft2025-12-24: 40.53 ft2025-12-29: 41.17 ft2026-01-03: 42.39 ft2026-01-08: 44.86 ft2026-01-13: 44.32 ft2026-01-18: 43.87 ft2026-01-23: 43.13 ft2026-01-28: 42.68 ft2026-02-02: 41.95 ft2026-02-07: 41.19 ft2026-02-12: 45.04 ft2026-02-17: 44.86 ft2026-02-22: 45.41 ft2026-02-27: 44.86 ft2026-03-04: 44.14 ft2026-03-09: 44.84 ft2026-03-14: 45.53 ft2026-03-19: 44.56 ft2026-03-24: 45.17 ft2026-03-29: 44.57 ft2026-04-03: 43.61 ft2026-04-08: 43.80 ft2026-04-13: 43.31 ft2026-04-18: 43.00 ft2026-04-23: 42.48 ft2026-04-28: 42.22 ft2026-05-03: 41.42 ft2026-05-08: 40.46 ft2026-05-13: 40.29 ft2026-05-18: 43.14 ft2026-05-23: 43.25 ft2026-05-28: 42.53 ft2026-06-02: 42.55 ft2026-06-07: 43.51 ft2026-06-12: 43.37 ft2026-06-17: 42.44 ft2026-06-22: 41.08 ft2026-06-27: 39.81 ft2026-07-02: 38.74 ft2026-07-07: 37.73 ft2026-07-12: 36.27 ft2026-07-17: 35.43 ft2026-07-22: 35.37 ft2026-07-27: 35.10 ft2026-08-01: 36.44 ft2026-08-06: 37.06 ft2026-08-11: 36.64 ft2026-08-17: 38.57 ft2026-08-22: 40.41 ft2026-08-28: 40.83 ft2026-09-02: 40.96 ft2026-09-07: 43.10 ft2026-09-12: 44.91 ft2026-09-17: 44.63 ft2026-09-22: 44.14 ft2026-09-27: 43.24 ft2026-10-04: 43.32 ft2026-10-12: 43.72 ft2026-10-17: 42.82 ft
20262025Normal (middle 50% of past years)Usual range (10th–90th percentile)Median

Each year drawn on the same January–December axis, over this gauge's normal range for each date. Hover or tap a point for its value.

Same date in past years

DateLevelvs today
Oct 23, 202435.89 ft▼ 6.34 ft
Oct 23, 202335.88 ft▼ 6.35 ft
Oct 23, 202235.89 ft▼ 6.34 ft
Oct 23, 202140.03 ft▼ 2.20 ft
Oct 23, 202035.70 ft▼ 6.53 ft
Oct 23, 201944.42 ft▲ 2.19 ft
Oct 23, 201843.87 ft▲ 1.64 ft
Oct 23, 201736.37 ft▼ 5.86 ft
Oct 23, 201638.28 ft▼ 3.95 ft

Records & details

Highest
46.22 ft on Jan 28, 2013
Lowest
25.19 ft on Sep 26, 2013
Records from
2011 (15 years of daily data)
Water temperature
Not measured here

Full history: yearly highs and lows, monthly averages →

Upper Helemano Reservoir

Height
51 ft
Completed
1912
Purposes
Irrigation
Owner
Private
Normal storage
479 acre-ft
Surface area
17 acres

National Inventory of Dams (U.S. Army Corps of Engineers). All dam facts →

Weather & wind

Today83°F · Mostly Sunny
Wind ENE 2 to 10 mph
Tonight69°F · Partly Cloudy
Wind NNW 8 mph
Saturday82°F · Mostly Sunny
Wind NNE 7 to 12 mph
Saturday Night69°F · Partly Cloudy
Wind NE 8 to 12 mph
Sunday81°F · Scattered Rain Showers then Mostly Sunny
Wind NE 9 mph
Sunday Night68°F · Partly Cloudy
Wind ENE 3 to 7 mph

NOAA National Weather Service forecast for this lake's location, updated 11 min ago.

Nearby lakes

All Hawaii lake levels →