Costilla Reservoir water level
▼ 2.7 points from 8.6% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-08253900, accessed October 1, 2026. Updated every 6 hours.
Costilla Reservoir is at 5.8% of full pool as of September 28, 2026. Costilla Reservoir was last full on June 21, 2010 (95.3% of normal storage). Costilla Reservoir is near Costilla, New Mexico.
Costilla Reservoir level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: USGS daily data.
Storage, % of full pool, since 1991
Costilla Reservoir is rising: 5.8% full, up 0.2 percentage points since September 20, 2026.
On this same date last year (September 28, 2025), Costilla Reservoir was 8.6% full, 2.8 percentage points higher than today's 5.8%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Costilla Reservoir map
Costilla Reservoir is at 36.8753, -105.2797. Open in OpenStreetMap.
The dam
- Irrigation
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Costilla Reservoir yet.
Common questions
- Costilla Reservoir is at 5.8% of full pool as of September 28, 2026.
- Costilla Reservoir was last full on June 21, 2010, when it held 95.3% of its normal storage. This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on USGS daily data since April 1, 1991.
- In USGS daily data since April 1, 1991, Costilla Reservoir's highest storage was 104.2% of normal storage on June 1, 1994. Its lowest after it first filled (May 23, 1994) was 3.4% of normal storage on August 16, 2002. These are the highest and lowest daily readings in the published data, not official records.
- Costilla Reservoir is near Costilla, New Mexico (36.8753, -105.2797).
- Private operates the dam at Costilla Reservoir.
- Costilla Reservoir's dam is used for Irrigation.