Reservoir · New Mexico · United States · USACE CWMS
Lake Sumner
13.4% full
Capacity
78.56 hm³
Volume stored
11 hm³
Vs month average
120% of normal
Coordinates
34.608°N, 104.384°W
Last updated
2026-10-20
Current fill
13.4%vs 7 days ago
-0.6%losing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
120%of normal
13.4% full on 2026-10-20, against an average of 11.2% for October across 2 years of readings (+2.2 points).
Drought Monitor at this site · 13 October 2026
D1moderate drought
The ground at Lake Sumner's coordinates falls inside the D1 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. New Mexico drought figures →
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-10-20.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.608, -104.384 · Open in Google Maps
About Lake Sumner
As of October 20, 2026, Lake Sumner is filled to 13.4% of its total capacity, holding roughly 11 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 (-0.6 pts).
Across the readings we hold for Lake Sumner — 99 data points between October 21, 2021 and October 20, 2026 — the level has ranged from a low of 4.1% (September 22, 2026) to a high of 15.0% (December 11, 2021).
It is operated by USACE primarily for multiple purposes. It lies within the New Mexico basin at 34.608°N, 104.384°W.
Key facts
- Current fill level
- 13.4%
- Water stored
- 11 hm³
- Total capacity
- 79 hm³
- 7-day change
- ▼ 0.6 pts
- Primary use
- Multipurpose
- River basin
- New Mexico
- Operator
- USACE
- Coordinates
- 34.608°N, 104.384°W
- Last updated
- October 20, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 20 Oct 2026 | 13.4% | 11 |
| 19 Oct 2026 | 13.5% | 11 |
| 18 Oct 2026 | 13.6% | 11 |
| 17 Oct 2026 | 13.8% | 11 |
| 16 Oct 2026 | 13.9% | 11 |
| 15 Oct 2026 | 14.1% | 11 |
| 14 Oct 2026 | 14.1% | 11 |
| 13 Oct 2026 | 14.0% | 11 |
| 12 Oct 2026 | 13.8% | 11 |
| 11 Oct 2026 | 13.6% | 11 |
| 10 Oct 2026 | 13.4% | 11 |
| 9 Oct 2026 | 13.1% | 10 |