Lake Alan Henry

As of October 13, 2026, Lake Alan Henry is filled to 70.4% of its total capacity, holding roughly 84 hm³ of water out of a maximum 119 hm³. At this level the reservoir is within its normal operating range.

Over the most recent week on record the fill level has held broadly steady (-0.5 pts), and it is 20.5 points below its level on the same date a year earlier.

Across the readings we hold for Lake Alan Henry — 1460 data points between October 15, 2022 and October 13, 2026 — the level has ranged from a low of 70.1% (May 21, 2023) to a high of 100.0% (June 12, 2024). On average the reservoir is fullest around June and at its lowest around April.

It is operated by TWDB primarily for multiple purposes. It lies within the Texas basin at 33.063°N, 101.048°W.