Lake Eucha

As of October 1, 2026, Lake Eucha is filled to 73.7% of its total capacity, holding roughly 72 hm³ of water out of a maximum 98 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 (-0.7 pts), and it is 10.7 points below its level on the same date a year earlier.

Across the readings we hold for Lake Eucha — 1461 data points between October 2, 2022 and October 1, 2026 — the level has ranged from a low of 65.6% (February 10, 2025) to a high of 100.8% (May 7, 2024). On average the reservoir is fullest around May and at its lowest around November.

It is operated by USGS primarily for multiple purposes. It lies within the Oklahoma basin at 36.375°N, 94.935°W.