Reservoir · New Mexico · United States · BOR RISE
Lake Sumner
Lake Sumner and Dam
5.2% full
Capacity
78.56 hm³
Volume stored
4 hm³
Coordinates
34.629°N, 104.392°W
Last updated
2026-09-09
Current fill
5.2%vs 7 days ago
-0.8%losing
vs 1 year ago
-17.6%year-over-year
7-day trend
→stable
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.629, -104.392 · Open in Google Maps
About Lake Sumner
As of September 9, 2026, Lake Sumner is filled to 5.2% of its total capacity, holding roughly 4 hm³ of water out of a maximum 79 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.8 pts), and it is 17.6 points below its level on the same date a year earlier.
Across the readings we hold for Lake Sumner — 1824 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 5.0% (August 8, 2022) to a high of 44.1% (June 8, 2023). On average the reservoir is fullest around February and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the New Mexico basin at 34.629°N, 104.392°W.
Key facts
- Current fill level
- 5.2%
- Water stored
- 4 hm³
- Total capacity
- 79 hm³
- 7-day change
- ▼ 0.8 pts
- Year-on-year
- ▼ 17.6 pts
- Primary use
- Multipurpose
- River basin
- New Mexico
- Operator
- BOR
- Coordinates
- 34.629°N, 104.392°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 5.2% | 4 |
| 8 Sep 2026 | 5.3% | 4 |
| 7 Sep 2026 | 5.4% | 4 |
| 6 Sep 2026 | 5.6% | 4 |
| 5 Sep 2026 | 5.7% | 4 |
| 4 Sep 2026 | 5.8% | 5 |
| 3 Sep 2026 | 5.9% | 5 |
| 2 Sep 2026 | 6.0% | 5 |
| 1 Sep 2026 | 6.2% | 5 |
| 31 Aug 2026 | 6.3% | 5 |
| 30 Aug 2026 | 6.4% | 5 |
| 29 Aug 2026 | 6.6% | 5 |