Reservoir · Pennsylvania · United States · USACE CWMS
Seneca Power Upper Reservoir
17.6% full
Capacity
7.12 hm³
Volume stored
1 hm³
Vs month average
36% of normal
Coordinates
41.834°N, 79.008°W
Last updated
2026-10-15
Current fill
17.6%vs 7 days ago
-50.2%losing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
36%of normal
17.6% full on 2026-10-15, against an average of 48.3% for October across 3 years of readings (-30.7 points).
Drought Monitor at this site · 13 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: 2026-10-15.
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 October 15, 2026, Seneca Power Upper Reservoir is filled to 17.6% of its total capacity, holding roughly 1 hm³ of water out of a maximum 7 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 50.2 percentage points.
Across the readings we hold for Seneca Power Upper Reservoir — 326 data points between October 16, 2021 and October 15, 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 May 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
- 17.6%
- Water stored
- 1 hm³
- Total capacity
- 7 hm³
- 7-day change
- ▼ 50.2 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.834°N, 79.008°W
- Last updated
- October 15, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 15 Oct 2026 | 17.6% | 1 |
| 14 Oct 2026 | 56.7% | 4 |
| 13 Oct 2026 | 48.3% | 3 |
| 12 Oct 2026 | 58.7% | 4 |
| 11 Oct 2026 | 79.1% | 6 |
| 10 Oct 2026 | 46.9% | 3 |
| 9 Oct 2026 | 37.4% | 3 |
| 8 Oct 2026 | 67.8% | 5 |
| 7 Oct 2026 | 69.7% | 5 |
| 6 Oct 2026 | 58.1% | 4 |
| 5 Oct 2026 | 90.3% | 6 |
| 4 Oct 2026 | 67.8% | 5 |