Reservoir · Oklahoma · United States · USACE CWMS
Birch Lake
78.9% full
Capacity
23.71 hm³
Volume stored
19 hm³
Vs month average
98% of normal
Coordinates
36.535°N, 96.162°W
Last updated
2026-10-28
Current fill
78.9%vs 7 days ago
-1.0 pplosing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
98%of normal
78.9% full on 2026-10-28, against an average of 80.4% for October across 2 years of readings (-1.5 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Birch Lake's coordinates falls inside the D1 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Oklahoma drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.535°N, 96.162°W · Open in Google Maps
About Birch Lake
As of October 28, 2026, Birch Lake is filled to 78.9% of its total capacity, holding 18.7 hm³ of water out of a maximum 23.71 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 1.0 percentage points.
Across the readings we hold for Birch Lake — 317 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 74.6% (January 30, 2022) to a high of 104.0% (May 5, 2022). On average the reservoir is fullest around July and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It is at 36.535°N, 96.162°W.
Key facts
- Current fill level
- 78.9% of total capacity
- Water stored
- 18.7 hm³
- Total capacity
- 23.71 hm³
- 7-day change
- ▼ 1.0 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 36.535°N, 96.162°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 78.9% | 18.7 |
| 27 Oct 2026 | 79.0% | 18.72 |
| 26 Oct 2026 | 79.1% | 18.76 |
| 25 Oct 2026 | 79.3% | 18.8 |
| 24 Oct 2026 | 79.4% | 18.83 |
| 23 Oct 2026 | 79.6% | 18.87 |
| 22 Oct 2026 | 79.8% | 18.92 |
| 21 Oct 2026 | 79.9% | 18.95 |
| 20 Oct 2026 | 80.1% | 18.99 |
| 19 Oct 2026 | 80.3% | 19.03 |
| 18 Oct 2026 | 80.4% | 19.06 |
| 17 Oct 2026 | 80.6% | 19.11 |