Reservoir · Oklahoma · United States · USGS NWIS
Lake Hefner at Oklahoma City, OK
95.6% full
Capacity
91.77 hm³
Volume stored
88 hm³
Coordinates
35.583°N, 97.596°W
Last updated
2026-06-11
Current fill
95.6%vs 7 days ago
-0.2%losing
vs 1 year ago
-6.5%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: 2026-06-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 35.583, -97.596 · Open in Google Maps
About Lake Hefner at Oklahoma City, OK
As of June 11, 2026, Lake Hefner at Oklahoma City, OK is filled to 95.6% of its total capacity, holding roughly 88 hm³ of water out of a maximum 92 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 6.5 points below its level on the same date a year earlier.
Across the readings we hold for Lake Hefner at Oklahoma City, OK — 1825 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 77.2% (October 22, 2022) to a high of 105.0% (June 27, 2021). 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 35.583°N, 97.596°W.
Key facts
- Current fill level
- 95.6%
- Water stored
- 88 hm³
- Total capacity
- 92 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 6.5 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USGS
- Coordinates
- 35.583°N, 97.596°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 95.6% | 88 |
| 10 Jun 2026 | 95.8% | 88 |
| 9 Jun 2026 | 96.1% | 88 |
| 8 Jun 2026 | 96.3% | 88 |
| 7 Jun 2026 | 96.5% | 89 |
| 6 Jun 2026 | 96.6% | 89 |
| 5 Jun 2026 | 96.7% | 89 |
| 4 Jun 2026 | 97.0% | 89 |
| 3 Jun 2026 | 97.1% | 89 |
| 2 Jun 2026 | 97.3% | 89 |
| 1 Jun 2026 | 97.5% | 90 |
| 31 May 2026 | 97.7% | 90 |
Frequently asked questions
What is the current water level of Lake Hefner at Oklahoma City, OK?
As of June 11, 2026, Lake Hefner at Oklahoma City, OK is at 95.6% of its capacity, holding approximately 88 hm³ of water, according to USGS NWIS data.
Is Lake Hefner at Oklahoma City, OK reservoir full?
Lake Hefner at Oklahoma City, OK is essentially full, sitting at 95.6% of capacity as of June 11, 2026.
Is the water level at Lake Hefner at Oklahoma City, OK rising or falling?
The level at Lake Hefner at Oklahoma City, OK has been broadly stable over the latest week on record (-0.2 points).
How much water can Lake Hefner at Oklahoma City, OK hold?
Lake Hefner at Oklahoma City, OK has a total capacity of 92 hm³.
Where is Lake Hefner at Oklahoma City, OK reservoir located?
Lake Hefner at Oklahoma City, OK is located in Oklahoma, United States, within the Oklahoma basin (coordinates 35.583°N, 97.596°W).
What is Lake Hefner at Oklahoma City, OK used for?
Lake Hefner at Oklahoma City, OK is used primarily for multiple purposes, and is managed by USGS.