Reservoir · Pennsylvania · United States · USACE CWMS
East Branch Clarion Lake
73.9% full
Capacity
80.55 hm³
Volume stored
60 hm³
Coordinates
41.561°N, 78.595°W
Last updated
2026-09-11
Current fill
73.9%vs 7 days ago
+0.5%gaining
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. 41.561, -78.595 · Open in Google Maps
About East Branch Clarion Lake
As of September 11, 2026, East Branch Clarion Lake is filled to 73.9% of its total capacity, holding roughly 60 hm³ of water out of a maximum 81 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (+0.5 pts).
Across the readings we hold for East Branch Clarion Lake — 327 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 68.2% (October 23, 2021) to a high of 104.8% (May 14, 2026). On average the reservoir is fullest around May and at its lowest around October.
It is operated by USACE primarily for multiple purposes. It lies within the Pennsylvania basin at 41.561°N, 78.595°W.
Key facts
- Current fill level
- 73.9%
- Water stored
- 60 hm³
- Total capacity
- 81 hm³
- 7-day change
- ▲ 0.5 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.561°N, 78.595°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 73.9% | 59 |
| 10 Sep 2026 | 73.8% | 59 |
| 9 Sep 2026 | 73.3% | 59 |
| 8 Sep 2026 | 73.5% | 59 |
| 7 Sep 2026 | 73.6% | 59 |
| 6 Sep 2026 | 73.6% | 59 |
| 5 Sep 2026 | 73.6% | 59 |
| 4 Sep 2026 | 73.4% | 59 |
| 3 Sep 2026 | 72.8% | 59 |
| 2 Sep 2026 | 71.7% | 58 |
| 1 Sep 2026 | 71.8% | 58 |
| 31 Aug 2026 | 72.1% | 58 |