Lake Hefner water level
▼ 22.5 points from 99.5% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-07159550, accessed October 1, 2026. Updated every 6 hours.
Lake Hefner is at 76% of full pool as of September 29, 2026. Lake Hefner was last full on June 14, 2026 (95% of normal storage). Lake Hefner is near Oklahoma City, Oklahoma.
Lake Hefner 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 1999
Lake Hefner is rising: 75% full, up 3.1 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Lake Hefner was 99.5% full, 24.5 percentage points higher than today's 75%.
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 Hefner map
Lake Hefner is at 35.5828, -97.5956. Open in OpenStreetMap.
The dam
- Water supply
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Lake Hefner yet.
Common questions
- Lake Hefner is at 76% of full pool as of September 29, 2026.
- Lake Hefner was last full on June 14, 2026, when it held 95% 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 November 17, 1999.
- In USGS daily data since November 17, 1999, Lake Hefner's highest storage was 108.9% of normal storage on June 10, 2013. Its lowest after it first filled (December 19, 1999) was 52.9% of normal storage on January 27, 2013. These are the highest and lowest daily readings in the published data, not official records.
- Lake Hefner is near Oklahoma City, Oklahoma (35.5828, -97.5956).
- Local Government operates the dam at Lake Hefner.
- Lake Hefner's dam is used for Water supply.