Reservoir · Oklahoma · United States · USACE CWMS
Birch Lake
94.3% full
Capacity
23.71 hm³
Volume stored
22 hm³
Coordinates
36.535°N, 96.162°W
Last updated
2026-07-30
Current fill
94.3%vs 7 days ago
-0.1%losing
vs 1 year ago
-2.1%year-over-year
7-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: 2026-07-30.
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 July 30, 2026, Birch Lake is filled to 94.3% of its total capacity, holding roughly 22 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 (-0.1 pts), and it is 2.1 points below its level on the same date a year earlier.
Across the readings we hold for Birch Lake — 330 data points between July 31, 2021 and July 30, 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
- 94.3%
- Water stored
- 22 hm³
- Total capacity
- 24 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 2.1 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.535°N, 96.162°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 94.3% | 22 |
| 29 Jul 2026 | 94.4% | 22 |
| 28 Jul 2026 | 94.6% | 22 |
| 27 Jul 2026 | 94.9% | 22 |
| 26 Jul 2026 | 95.1% | 23 |
| 25 Jul 2026 | 95.3% | 23 |
| 24 Jul 2026 | 95.5% | 23 |
| 23 Jul 2026 | 95.7% | 23 |
| 22 Jul 2026 | 95.9% | 23 |
| 21 Jul 2026 | 96.2% | 23 |
| 20 Jul 2026 | 96.4% | 23 |
| 19 Jul 2026 | 97.0% | 23 |
Frequently asked questions
What is the current water level of Birch Lake?
As of July 30, 2026, Birch Lake is at 94.3% of its capacity, holding approximately 22 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Birch Lake reservoir full?
No. As of July 30, 2026, Birch Lake is high at 94.3% of its capacity, so it is not full.
Is the water level at Birch Lake rising or falling?
The level at Birch Lake has been broadly stable over the latest week on record (-0.1 points).
How much water can Birch Lake hold?
Birch Lake has a total capacity of 24 hm³.
Where is Birch Lake reservoir located?
Birch Lake is located in Oklahoma, United States, within the Oklahoma basin (coordinates 36.535°N, 96.162°W).
What is Birch Lake used for?
Birch Lake is used primarily for multiple purposes, and is managed by USACE.