Dam · Eastern Cape · South Africa · DWS
Grassridge Dam
81.8% full
Total capacity
44.5 hm³
River
Groot Brak River
Basin
Mzimvubu-Tsitsikamma
Primary use
water supply
Operator
DWS South Africa
Coordinates
31.768°S, 25.466°E
Last updated
2026-10-19
Current fill
81.8%vs 7 days ago
-11.1 pplosing
vs 1 year ago
+30.4 ppyear-over-year
7-day trend
↓falling
Drought context
Rain over the last three months · 11 October 2026
Extremely wet
In the three months to 11 October 2026 the area around Grassridge Dam had exceptionally wet conditions, a surplus seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index +2.24). Rain, not storage. South Africa drought figures →
Weekly storage
Fill history — multi-year
About this dam
Data source
official
Storage data: Department of Water and Sanitation (DWS) Weekly State of Dams report, South Africa.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 31.768°S, 25.466°E · Open in Google Maps
About Grassridge Dam
As of October 19, 2026, Grassridge Dam is filled to 81.8% of its total capacity, holding 36.4 hm³ of water out of a maximum 44.5 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 11.1 percentage points, and it is 30.4 points above its level on the same date a year earlier.
Across the readings we hold for Grassridge Dam — 20 data points between October 19, 2025 and October 19, 2026 — the level has ranged from a low of 51.4% (October 19, 2025) to a high of 94.2% (October 5, 2026). On average the reservoir is fullest around May and at its lowest around June.
It is operated by DWS South Africa primarily for water supply. It lies within the Mzimvubu-Tsitsikamma basin at 31.768°S, 25.466°E.
Key facts
- Current fill level
- 81.8% of total capacity
- Water stored
- 36.4 hm³
- Total capacity
- 44.5 hm³
- 7-day change
- ▼ 11.1 pp
- Year-on-year
- ▲ 30.4 pp
- Primary use
- Water supply
- River
- Groot Brak River
- River basin
- Mzimvubu-Tsitsikamma
- Operator
- DWS South Africa
- Coordinates
- 31.768°S, 25.466°E
- Last updated
- October 19, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 19 Oct 2026 | 81.8% | 36.4 |
| 12 Oct 2026 | 92.9% | 41.3 |
| 5 Oct 2026 | 94.2% | 41.9 |
| 28 Sep 2026 | 92.9% | 41.3 |
| 21 Sep 2026 | 85.3% | 38 |
| 31 Aug 2026 | 68.6% | 30.5 |
| 24 Aug 2026 | 77.0% | 34.3 |
| 17 Aug 2026 | 80.9% | 36 |
| 10 Aug 2026 | 82.9% | 36.9 |
| 3 Aug 2026 | 85.9% | 38.2 |
| 27 Jul 2026 | 88.6% | 39.4 |
| 29 Jun 2026 | 64.5% | 28.7 |
Nearby reservoirs
See also: South Africa dam levels, explained — how the DWS Weekly State of Dams report becomes the national and provincial figures.