Costilla Reservoir Water Level
New Mexico · updated daily from the U.S. Geological Survey
40.71 ft
Costilla Reservoir is current reading available and steady (+0.09 ft in the last 7 days).
Change since yesterday: +0.06 ft
Reading as of 2026-08-15
Where Costilla Reservoir sits historically
Today's level compared with every reading in our 0.3-year record for this lake.
Since yesterday
+0.06 ft
7-day change
+0.09 ft
30-day change
+1.69 ft
1-year change
— ft
Last 30 days
Last 12 months
Costilla Reservoir records and averages
| Current level | 40.71 ft |
|---|---|
| Record high | 65.18 ft (2026-05-17) |
| Record low | 36.6 ft (2026-06-30) |
| Average of all readings | 51.51 ft |
| Data span | 0.3 years (119 readings) |
Frequently asked questions
Is Costilla Reservoir full right now?
As of 2026-08-15, Costilla Reservoir sits at 40.71 ft, which is current reading available.Over the past 30 days the level has risen 1.69 ft.
What is the water level at Costilla Reservoir today?
The most recent reading is 40.71 ft (2026-08-15), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Costilla Reservoir has ever been?
The highest level in our records is 65.18 ft on 2026-05-17. The lowest is 36.6 ft on 2026-06-30. Our record covers about 0.3 years of readings.
Why is Costilla Reservoir changing right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Costilla Reservoir has risen 1.69 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Costilla Reservoir changed over the past year?
Year-over-year comparison is not available for this lake yet. The full-history chart above covers 0.3 years, with a record high of 65.18 ft and a record low of 36.6 ft.
Nearby lakes in New Mexico
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All New Mexico lake levels.