Reservoir · Oklahoma · United States · USACE CWMS
Birch Lake
86.1% full
Capacity
23.71 hm³
Volume stored
20 hm³
Coordinates
36.535°N, 96.162°W
Last updated
2026-09-11
Current fill
86.1%vs 7 days ago
-0.2%losing
vs 1 year ago
N/A7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.535, -96.162 · Open in Google Maps
About Birch Lake
As of September 11, 2026, Birch Lake is filled to 86.1% of its total capacity, holding roughly 20 hm³ of water out of a maximum 24 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).
Across the readings we hold for Birch Lake — 330 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 74.6% (January 30, 2022) to a high of 105.0% (June 24, 2026). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the Oklahoma basin at 36.535°N, 96.162°W.
Key facts
- Current fill level
- 86.1%
- Water stored
- 20 hm³
- Total capacity
- 24 hm³
- 7-day change
- ▼ 0.2 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.535°N, 96.162°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 86.1% | 20 |
| 10 Sep 2026 | 86.2% | 20 |
| 9 Sep 2026 | 85.3% | 20 |
| 8 Sep 2026 | 85.5% | 20 |
| 7 Sep 2026 | 85.7% | 20 |
| 6 Sep 2026 | 86.0% | 20 |
| 5 Sep 2026 | 86.1% | 20 |
| 4 Sep 2026 | 86.3% | 20 |
| 3 Sep 2026 | 86.6% | 21 |
| 2 Sep 2026 | 86.7% | 21 |
| 1 Sep 2026 | 87.0% | 21 |
| 31 Aug 2026 | 87.2% | 21 |