Reservoir · Oklahoma · United States · USGS NWIS
Lake Humphreys
54.3% full
Capacity
24.76 hm³
Volume stored
13 hm³
Coordinates
34.584°N, 97.886°W
Last updated
2026-09-30
Current fill
54.3%vs 7 days ago
-0.6%losing
vs 1 year ago
-12.6%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. Last reading: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.584, -97.886 · Open in Google Maps
About Lake Humphreys
As of September 30, 2026, Lake Humphreys is filled to 54.3% of its total capacity, holding roughly 13 hm³ of water out of a maximum 25 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 (-0.6 pts), and it is 12.6 points below its level on the same date a year earlier.
Across the readings we hold for Lake Humphreys — 1461 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 47.9% (October 16, 2023) to a high of 100.0% (May 2, 2025). On average the reservoir is fullest around May and at its lowest around January.
It is operated by USGS primarily for multiple purposes. It lies within the Oklahoma basin at 34.584°N, 97.886°W.
Key facts
- Current fill level
- 54.3%
- Water stored
- 13 hm³
- Total capacity
- 25 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 12.6 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USGS
- Coordinates
- 34.584°N, 97.886°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 54.3% | 13 |
| 29 Sep 2026 | 54.3% | 13 |
| 28 Sep 2026 | 54.4% | 13 |
| 27 Sep 2026 | 54.7% | 14 |
| 26 Sep 2026 | 54.6% | 14 |
| 25 Sep 2026 | 54.9% | 14 |
| 24 Sep 2026 | 54.9% | 14 |
| 23 Sep 2026 | 54.9% | 14 |
| 22 Sep 2026 | 55.1% | 14 |
| 21 Sep 2026 | 55.3% | 14 |
| 20 Sep 2026 | 55.4% | 14 |
| 19 Sep 2026 | 55.4% | 14 |