Reservoir · Oklahoma · United States · USGS NWIS
Lake Overholser
63.3% full
Capacity
18.5 hm³
Volume stored
12 hm³
Coordinates
35.486°N, 97.666°W
Last updated
2026-09-30
Current fill
63.3%vs 7 days ago
-0.9%losing
vs 1 year ago
-34.9%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. 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. 35.486, -97.666 · Open in Google Maps
About Lake Overholser
As of September 30, 2026, Lake Overholser is filled to 63.3% of its total capacity, holding roughly 12 hm³ of water out of a maximum 19 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 34.9 points below its level on the same date a year earlier.
Across the readings we hold for Lake Overholser — 1461 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 63.1% (September 26, 2026) to a high of 105.0% (July 11, 2023). On average the reservoir is fullest around July and at its lowest around October.
It is operated by USGS primarily for multiple purposes. It lies within the Oklahoma basin at 35.486°N, 97.666°W.
Key facts
- Current fill level
- 63.3%
- Water stored
- 12 hm³
- Total capacity
- 19 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 34.9 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USGS
- Coordinates
- 35.486°N, 97.666°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 63.3% | 12 |
| 29 Sep 2026 | 63.5% | 12 |
| 28 Sep 2026 | 63.9% | 12 |
| 27 Sep 2026 | 63.8% | 12 |
| 26 Sep 2026 | 63.1% | 12 |
| 25 Sep 2026 | 63.6% | 12 |
| 24 Sep 2026 | 63.9% | 12 |
| 23 Sep 2026 | 64.2% | 12 |
| 22 Sep 2026 | 64.6% | 12 |
| 21 Sep 2026 | 65.1% | 12 |
| 20 Sep 2026 | 65.1% | 12 |
| 19 Sep 2026 | 65.4% | 12 |