Sam Rayburn Reservoir

As of October 13, 2026, Sam Rayburn Reservoir is filled to 63.0% of its total capacity, holding roughly 2,219 hm³ of water out of a maximum 3,524 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 (-0.9 pts), and it is 8.3 points below its level on the same date a year earlier.

Across the readings we hold for Sam Rayburn Reservoir — 1460 data points between October 15, 2022 and October 13, 2026 — the level has ranged from a low of 63.0% (October 13, 2026) to a high of 100.0% (February 17, 2023). On average the reservoir is fullest around May and at its lowest around December.

It is operated by TWDB primarily for multiple purposes. It lies within the Texas basin at 31.061°N, 94.106°W.