Reservoir · Pennsylvania · United States · USACE CWMS
Seneca Power Upper Reservoir, PA
44.2% full
Capacity
7.12 hm³
Volume stored
3 hm³
Coordinates
41.834°N, 79.008°W
Last updated
2026-07-30
Current fill
44.2%vs 7 days ago
+1.5%gaining
vs 1 year ago
-31.6%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. 41.834, -79.008 · Open in Google Maps
About Seneca Power Upper Reservoir, PA
As of July 30, 2026, Seneca Power Upper Reservoir, PA is filled to 44.2% of its total capacity, holding roughly 3 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 held broadly steady (+1.5 pts), and it is 31.6 points below its level on the same date a year earlier.
Across the readings we hold for Seneca Power Upper Reservoir, PA — 316 data points between July 31, 2021 and July 30, 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
- 44.2%
- Water stored
- 3 hm³
- Total capacity
- 7 hm³
- 7-day change
- ▲ 1.5 pts
- Year-on-year
- ▼ 31.6 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.834°N, 79.008°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 44.2% | 3 |
| 29 Jul 2026 | 42.7% | 3 |
| 28 Jul 2026 | 39.7% | 3 |
| 27 Jul 2026 | 44.0% | 3 |
| 26 Jul 2026 | 42.3% | 3 |
| 25 Jul 2026 | 44.2% | 3 |
| 24 Jul 2026 | 39.5% | 3 |
| 23 Jul 2026 | 43.1% | 3 |
| 22 Jul 2026 | 41.6% | 3 |
| 21 Jul 2026 | 41.4% | 3 |
| 20 Jul 2026 | 43.0% | 3 |
| 19 Jul 2026 | 41.0% | 3 |
Frequently asked questions
What is the current water level of Seneca Power Upper Reservoir, PA?
As of July 30, 2026, Seneca Power Upper Reservoir, PA is at 44.2% of its capacity, holding approximately 3 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Seneca Power Upper Reservoir, PA reservoir full?
No. As of July 30, 2026, Seneca Power Upper Reservoir, PA is within its normal operating range at 44.2% of its capacity, so it is not full.
Is the water level at Seneca Power Upper Reservoir, PA rising or falling?
The level at Seneca Power Upper Reservoir, PA has been broadly stable over the latest week on record (+1.5 points).
How much water can Seneca Power Upper Reservoir, PA hold?
Seneca Power Upper Reservoir, PA has a total capacity of 7 hm³.
Where is Seneca Power Upper Reservoir, PA reservoir located?
Seneca Power Upper Reservoir, PA is located in Pennsylvania, United States, within the Pennsylvania basin (coordinates 41.834°N, 79.008°W).
What is Seneca Power Upper Reservoir, PA used for?
Seneca Power Upper Reservoir, PA is used primarily for multiple purposes, and is managed by USACE.