Reservoir · Pennsylvania · United States · USACE CWMS
Allegheny Reservoir
79.3% full
Capacity
706.79 hm³
Volume stored
561 hm³
Vs month average
90% of normal
Coordinates
41.838°N, 79.004°W
Last updated
2026-10-28
Current fill
79.3%vs 7 days ago
-3.8 pplosing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
90%of normal
79.3% full on 2026-10-28, against an average of 88.0% for October across 2 years of readings (-8.7 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Allegheny 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. 41.838°N, 79.004°W · Open in Google Maps
About Allegheny Reservoir
As of October 28, 2026, Allegheny Reservoir is filled to 79.3% of its total capacity, holding 560.8 hm³ of water out of a maximum 706.79 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 3.8 percentage points.
Across the readings we hold for Allegheny Reservoir — 309 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 55.5% (February 2, 2022) to a high of 105.0% (April 19, 2022). On average the reservoir is fullest around May and at its lowest around January.
It is operated by USACE primarily for multiple purposes. It is at 41.838°N, 79.004°W.
Key facts
- Current fill level
- 79.3% of total capacity
- Water stored
- 560.8 hm³
- Total capacity
- 706.79 hm³
- 7-day change
- ▼ 3.8 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 41.838°N, 79.004°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 79.3% | 560.8 |
| 27 Oct 2026 | 79.7% | 563.09 |
| 26 Oct 2026 | 80.1% | 565.9 |
| 25 Oct 2026 | 80.6% | 569.49 |
| 24 Oct 2026 | 81.2% | 573.98 |
| 23 Oct 2026 | 81.9% | 578.51 |
| 22 Oct 2026 | 82.4% | 582.41 |
| 21 Oct 2026 | 83.1% | 587.35 |
| 20 Oct 2026 | 83.7% | 591.68 |
| 19 Oct 2026 | 84.3% | 595.76 |
| 18 Oct 2026 | 84.9% | 599.72 |
| 17 Oct 2026 | 85.5% | 604.23 |