Reservoir · Pennsylvania · United States · USACE CWMS
Seneca Power Upper Reservoir
16.9% full
Capacity
7.12 hm³
Volume stored
1 hm³
Vs month average
44% of normal
Coordinates
41.834°N, 79.008°W
Last updated
2026-10-28
Current fill
16.9%vs 7 days ago
-0.2 pplosing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
44%of normal
16.9% full on 2026-10-28, against an average of 38.6% for October across 2 years of readings (-21.7 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Seneca Power Upper Reservoir's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Pennsylvania 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. 41.834°N, 79.008°W · Open in Google Maps
About Seneca Power Upper Reservoir
As of October 28, 2026, Seneca Power Upper Reservoir is filled to 16.9% of its total capacity, holding 1.2 hm³ of water out of a maximum 7.12 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.2 pp).
Across the readings we hold for Seneca Power Upper Reservoir — 318 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 15.6% (January 13, 2022) to a high of 104.6% (July 9, 2026). On average the reservoir is fullest around January and at its lowest around October.
It is operated by USACE primarily for multiple purposes. It is at 41.834°N, 79.008°W.
Key facts
- Current fill level
- 16.9% of total capacity
- Water stored
- 1.2 hm³
- Total capacity
- 7.12 hm³
- 7-day change
- ▼ 0.2 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 41.834°N, 79.008°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 16.9% | 1.2 |
| 27 Oct 2026 | 16.9% | 1.2 |
| 26 Oct 2026 | 16.9% | 1.2 |
| 25 Oct 2026 | 17.0% | 1.21 |
| 24 Oct 2026 | 17.0% | 1.21 |
| 23 Oct 2026 | 17.1% | 1.22 |
| 22 Oct 2026 | 17.1% | 1.22 |
| 21 Oct 2026 | 17.1% | 1.22 |
| 20 Oct 2026 | 17.3% | 1.23 |
| 19 Oct 2026 | 17.3% | 1.23 |
| 18 Oct 2026 | 17.4% | 1.24 |
| 17 Oct 2026 | 17.4% | 1.24 |