Koolau Reservoir water level · HI
Wind forecast, gusts, and gage height for small-craft sailing at Koolau Reservoir (Koolau Reservoir Near Wahiawa).
Gage height recorded at USGS gauge 16206600, refreshed every 15 minutes to 1 hour depending on the sensor.
6.98ft
recorded Nov 4, 2:50 AM
+0.04ft
rising
+0.18ft
rising
6.75–6.98ft
lowest to highest
Recent daily readings
| Date | Level (ft) | Δ day |
|---|---|---|
| Nov 4● | 6.98 | ↑ 0.04 |
| Nov 3 | 6.94 | ↓ 0.01 |
| Nov 2 | 6.95 | ↑ 0.03 |
| Nov 1 | 6.92 | 0 |
| Oct 31 | 6.92 | ↓ 0.01 |
| Oct 30 | 6.93 | ↑ 0.01 |
| Oct 29 | 6.92 | ↑ 0.12 |
| Oct 28 | 6.80 | ↑ 0.05 |
| Oct 27 | 6.75 | ↓ 0.01 |
| Oct 26 | 6.76 | ↓ 0.02 |
| Oct 25 | 6.78 | 0 |
| Oct 24 | 6.78 | 0 |
| Oct 23 | 6.78 | ↑ 0.01 |
| Oct 22 | 6.77 | — |
Readings fetched Nov 4, 3:12 AM; the chart above loads the latest data live from USGS.
Koolau Reservoir water level questions
- What is the water level at Koolau Reservoir today?
- 6.98 ft, recorded Nov 4, 2:50 AM at USGS gauge 16206600. The chart above refreshes live from the same gauge.
- Is Koolau Reservoir rising or falling?
- rising — 0.18 ft over the last 7 days.
- How does this compare to normal for Koolau Reservoir?
- Over the last 14 days the gauge has ranged from 6.75 ft to 6.98 ft; today's reading sits near the top of that range.
- Where does the water level data for Koolau Reservoir come from?
- USGS gauge 16206600 (Koolau Reservoir Near Wahiawa), which reports every 15 minutes to 1 hour. Readings are provisional until reviewed by the USGS.
- What is the water temperature at Koolau Reservoir?
- This gauge has no live water-temperature sensor — the fishing tab shows a seasonal estimate based on air temperature.
Gage height history
Gage height · USGS gauge 16206600
Reading the chart. This gauge reports gage height — the depth of water above the sensor reference point, not absolute elevation. Trends matter more than the absolute number: a falling trend means shrinking launch depth.
Water levels respond to dam operations, irrigation drawdown, snowmelt, and recent rainfall. For launch decisions, combine the trend here with the wind forecast — low water plus strong wind makes steep, tired ramps.
About this lake
- Location
- 21.4921°, -157.9702°
- Gauge datum
- 1,032 ft
- USGS gauge
- 16206600
- Water temp sensor
- No
Water level data comes from the USGS gauge above; wind is modeled for the lake’s coordinates by Open-Meteo. Always confirm conditions locally before launching — shorelines, ramps, and trees can all change what you feel on the water. West of the Rockies, wind follows the gaps: passes and river canyons channel strong flow onto the water, afternoons run windier than mornings, and mountain lakes in particular can build fast as the slopes heat up.
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