Reservoir · New Mexico · United States · USGS NWIS
Costilla Reservoir
5.9% full
Capacity
19.53 hm³
Volume stored
1 hm³
Coordinates
36.875°N, 105.280°W
Last updated
2026-09-30
Current fill
5.9%vs 7 days ago
+0.2%gaining
vs 1 year ago
-2.4%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — 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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.875, -105.280 · Open in Google Maps
About Costilla Reservoir
As of September 30, 2026, Costilla Reservoir is filled to 5.9% of its total capacity, holding roughly 1 hm³ of water out of a maximum 20 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it is 2.4 points below its level on the same date a year earlier.
Across the readings we hold for Costilla Reservoir — 1461 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 4.3% (June 29, 2026) to a high of 75.8% (June 13, 2023). On average the reservoir is fullest around June and at its lowest around September.
It is operated by USGS primarily for multiple purposes. It lies within the New Mexico basin at 36.875°N, 105.280°W.
Key facts
- Current fill level
- 5.9%
- Water stored
- 1 hm³
- Total capacity
- 20 hm³
- 7-day change
- ▲ 0.2 pts
- Year-on-year
- ▼ 2.4 pts
- Primary use
- Multipurpose
- River basin
- New Mexico
- Operator
- USGS
- Coordinates
- 36.875°N, 105.280°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 5.9% | 1 |
| 29 Sep 2026 | 5.8% | 1 |
| 28 Sep 2026 | 5.8% | 1 |
| 27 Sep 2026 | 5.8% | 1 |
| 26 Sep 2026 | 5.9% | 1 |
| 25 Sep 2026 | 5.9% | 1 |
| 24 Sep 2026 | 5.8% | 1 |
| 23 Sep 2026 | 5.7% | 1 |
| 22 Sep 2026 | 5.7% | 1 |
| 21 Sep 2026 | 5.7% | 1 |
| 20 Sep 2026 | 5.7% | 1 |
| 19 Sep 2026 | 5.7% | 1 |