High Island Reservoir
New Territories · New Territories · New Territories catchments
Capacity
281.11 hm³
Coordinates
22.375°N, 114.355°E
Operator
Water Supplies Department (WSD)
81.8% full
Current fill
81.8%vs 7 days ago
0.0%stable
vs 1 year ago
+4.9%year-over-year
7-day trend
→stable
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Technical specifications
| Total capacity | 281.11 hm³ |
| Usable capacity | 281.11 hm³ |
| Year built | 1978 |
| Primary use | water supply |
| Operator | Water Supplies Department (WSD) |
| Province | New Territories |
| Autonomous community | New Territories |
| River basin | New Territories catchments |
Satellite imagery: Esri, Maxar, Earthstar Geographics. 22.375, 114.355 · Open in Google Maps
About High Island Reservoir
As of August 16, 2026, High Island Reservoir is filled to 81.8% of its total capacity, holding roughly 230 hm³ of water out of a maximum 281 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 4.9 points above its level on the same date a year earlier.
Across the readings we hold for High Island Reservoir — 181 data points between January 16, 2019 and August 16, 2026 — the level has ranged from a low of 51.5% (May 1, 2022) to a high of 84.8% (September 16, 2019). On average the reservoir is fullest around October and at its lowest around April.
The dam at High Island Reservoir was completed in 1978. It is operated by Water Supplies Department (WSD) primarily for water supply. It lies within the New Territories catchments basin at 22.375°N, 114.355°E.
Key facts
- Current fill level
- 81.8%
- Water stored
- 230 hm³
- Total capacity
- 281 hm³
- 7-day change
- No change
- Year-on-year
- ▲ 4.9 pts
- Primary use
- Water supply
- River basin
- New Territories catchments
- Year completed
- 1978
- Operator
- Water Supplies Department (WSD)
- Coordinates
- 22.375°N, 114.355°E
- Last updated
- August 16, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 16 Aug 2026 | 81.8% | 230 |
| 1 Aug 2026 | 77.7% | 218 |
| 16 Jul 2026 | 71.6% | 201 |
| 1 Jul 2026 | 67.8% | 191 |
| 16 Jun 2026 | 65.0% | 183 |
| 1 Jun 2026 | 62.4% | 176 |
| 16 May 2026 | 62.8% | 176 |
| 1 May 2026 | 63.9% | 180 |
| 16 Apr 2026 | 64.9% | 182 |
| 1 Apr 2026 | 65.8% | 185 |
| 16 Mar 2026 | 66.8% | 188 |
| 1 Mar 2026 | 67.4% | 190 |
Frequently asked questions
What is the current water level of High Island Reservoir?
As of August 16, 2026, High Island Reservoir is at 81.8% of its capacity, holding approximately 230 hm³ of water, according to WSD data.
Is High Island Reservoir reservoir full?
No. As of August 16, 2026, High Island Reservoir is high at 81.8% of its capacity, so it is not full.
Is the water level at High Island Reservoir rising or falling?
The level at High Island Reservoir has been broadly stable over the latest week on record (0.0 points).
How much water can High Island Reservoir hold?
High Island Reservoir has a total capacity of 281 hm³.
Where is High Island Reservoir reservoir located?
High Island Reservoir is located in New Territories, Hong Kong, within the New Territories catchments basin (coordinates 22.375°N, 114.355°E).
When was High Island Reservoir dam built?
The dam at High Island Reservoir was completed in 1978.
What is High Island Reservoir used for?
High Island Reservoir is used primarily for water supply, and is managed by Water Supplies Department (WSD).