Lake Humphreys water level
▼ 18.6 points from 96.2% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-07329605, accessed October 1, 2026. Updated every 6 hours.
Lake Humphreys is at 77.6% of full pool as of September 29, 2026. Lake Humphreys was last full on October 2, 2025 (95.2% of normal storage). Lake Humphreys is near Duncan, Oklahoma.
Lake Humphreys level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: USGS daily data.
Storage, % of full pool, since 2014
Lake Humphreys is falling: 77.8% full, down 0.7 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Lake Humphreys was 96.2% full, 18.4 percentage points higher than today's 77.8%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Lake Humphreys map
Lake Humphreys is at 34.5844, -97.8856. Open in OpenStreetMap.
The dam
- Flood control
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Lake Humphreys yet.
Common questions
- Lake Humphreys is at 77.6% of full pool as of September 29, 2026.
- Lake Humphreys was last full on October 2, 2025, when it held 95.2% of its normal storage. This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on USGS daily data since May 8, 2014.
- In USGS daily data since May 8, 2014, Lake Humphreys's highest storage was 142.9% of normal storage on May 2, 2025. Its lowest after it first filled (May 23, 2015) was 68.5% of normal storage on October 15, 2023. These are the highest and lowest daily readings in the published data, not official records.
- Lake Humphreys is near Duncan, Oklahoma (34.5844, -97.8856).
- State operates the dam at Lake Humphreys.
- Lake Humphreys's dam is used for Flood control.