Reservoir · Oklahoma · United States · USGS NWIS
Lake Hefner at Oklahoma City, OK
88.5% full
Capacity
91.77 hm³
Volume stored
81 hm³
Coordinates
35.583°N, 97.596°W
Last updated
2026-07-29
Current fill
88.5%vs 7 days ago
-0.3%losing
vs 1 year ago
-7.8%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: 2026-07-29.
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 July 29, 2026, Lake Hefner at Oklahoma City, OK is filled to 88.5% of its total capacity, holding roughly 81 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 (-0.3 pts), and it is 7.8 points below its level on the same date a year earlier.
Across the readings we hold for Lake Hefner at Oklahoma City, OK — 1461 data points between July 30, 2022 and July 29, 2026 — the level has ranged from a low of 77.2% (October 22, 2022) to a high of 105.0% (July 12, 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 35.583°N, 97.596°W.
Key facts
- Current fill level
- 88.5%
- Water stored
- 81 hm³
- Total capacity
- 92 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 7.8 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USGS
- Coordinates
- 35.583°N, 97.596°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 88.5% | 81 |
| 28 Jul 2026 | 88.8% | 81 |
| 27 Jul 2026 | 89.1% | 82 |
| 26 Jul 2026 | 89.4% | 82 |
| 25 Jul 2026 | 89.7% | 82 |
| 24 Jul 2026 | 89.9% | 82 |
| 23 Jul 2026 | 90.1% | 83 |
| 22 Jul 2026 | 90.4% | 83 |
| 21 Jul 2026 | 90.7% | 83 |
| 20 Jul 2026 | 91.0% | 83 |
| 19 Jul 2026 | 91.2% | 84 |
| 18 Jul 2026 | 91.5% | 84 |
Frequently asked questions
What is the current water level of Lake Hefner at Oklahoma City, OK?
As of July 29, 2026, Lake Hefner at Oklahoma City, OK is at 88.5% of its capacity, holding approximately 81 hm³ of water, according to USGS NWIS data.
Is Lake Hefner at Oklahoma City, OK reservoir full?
No. As of July 29, 2026, Lake Hefner at Oklahoma City, OK is high at 88.5% of its capacity, so it is not full.
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 (-0.3 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.