Reservoir · Pennsylvania · United States · USACE CWMS
Seneca Power Upper Reservoir
66.6% full
Capacity
7.12 hm³
Volume stored
5 hm³
Coordinates
41.834°N, 79.008°W
Last updated
2026-09-11
Current fill
66.6%vs 7 days ago
+24.0%gaining
vs 1 year ago
N/A7-day trend
↑rising
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. 41.834, -79.008 · Open in Google Maps
About Seneca Power Upper Reservoir
As of September 11, 2026, Seneca Power Upper Reservoir is filled to 66.6% of its total capacity, holding roughly 5 hm³ of water out of a maximum 7 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 24.0 percentage points.
Across the readings we hold for Seneca Power Upper Reservoir — 316 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 15.6% (January 13, 2022) to a high of 105.0% (January 19, 2022). On average the reservoir is fullest around June and at its lowest around November.
It is operated by USACE primarily for multiple purposes. It lies within the Pennsylvania basin at 41.834°N, 79.008°W.
Key facts
- Current fill level
- 66.6%
- Water stored
- 5 hm³
- Total capacity
- 7 hm³
- 7-day change
- ▲ 24.0 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.834°N, 79.008°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 66.6% | 5 |
| 10 Sep 2026 | 40.7% | 3 |
| 9 Sep 2026 | 41.0% | 3 |
| 8 Sep 2026 | 39.7% | 3 |
| 7 Sep 2026 | 87.9% | 6 |
| 6 Sep 2026 | 60.7% | 4 |
| 5 Sep 2026 | 43.5% | 3 |
| 4 Sep 2026 | 42.6% | 3 |
| 3 Sep 2026 | 43.4% | 3 |
| 2 Sep 2026 | 44.9% | 3 |
| 1 Sep 2026 | 43.0% | 3 |
| 31 Aug 2026 | 44.0% | 3 |