Koolau Reservoir water level today
Lake in Honolulu County, Hawaii
6.78ft
2.07 m · gauge reading (local datum, not an elevation)
Measured · provisional
Steady
24 hours
▲ 0.01 ft
7 days
▲ 0.64 ft
30 days
▲ 0.22 ft
What this means
It is higher than on Oct 23 in every one of the last 3 years on record.
The lake has risen 0.64 ft in 7 days and risen 0.22 ft in 30 days.
Since 2022, the lowest daily level was 5.86 ft (Jul 2026) and the highest 10.73 ft (Mar 2026).
Koolau Reservoir level chart
Loading chart…
Measured
Normal range for the date (middle 50% of past years)
Same date in past years
| Date | Level | vs today |
|---|---|---|
| Oct 23, 2025 | 5.88 ft | ▼ 0.90 ft |
| Oct 23, 2024 | 5.89 ft | ▼ 0.89 ft |
| Oct 23, 2023 | 5.89 ft | ▼ 0.89 ft |
Records & details
- Highest
- 10.73 ft on Mar 21, 2026
- Lowest
- 5.86 ft on Jul 10, 2026
- Records from
- 2022 (4 years of daily data)
- Water temperature
- Not measured here
Koolau Reservoir
- Height
- 70 ft
- Completed
- 1919
- Purposes
- Other
- Owner
- Schofield Barracks
- Normal storage
- 122 acre-ft
- Surface area
- 5 acres
National Inventory of Dams (U.S. Army Corps of Engineers). All dam facts →
Weather & wind
Today80°F · Scattered Rain Showers
Wind ENE 8 to 13 mph
Wind ENE 8 to 13 mph
Tonight68°F · Isolated Rain Showers
Wind NE 13 mph
Wind NE 13 mph
Saturday80°F · Isolated Rain Showers
Wind NE 14 mph
Wind NE 14 mph
Saturday Night68°F · Scattered Rain Showers
Wind NE 8 to 12 mph
Wind NE 8 to 12 mph
Sunday79°F · Scattered Rain Showers
Wind NE 6 to 9 mph
Wind NE 6 to 9 mph
Sunday Night66°F · Scattered Rain Showers
Wind ENE 6 mph
Wind ENE 6 mph
NOAA National Weather Service forecast for this lake's location, updated 2 h ago.