Reservoir · Pennsylvania · United States · USACE CWMS
Allegheny Reservoir
87.0% full
Capacity
706.79 hm³
Volume stored
615 hm³
Vs month average
96% of normal
Coordinates
41.838°N, 79.004°W
Last updated
2026-10-13
Current fill
87.0%vs 7 days ago
-7.3%losing
vs 1 year ago
N/A7-day trend
↓falling
Drought context
Storage vs October average
96%of normal
87.0% full on 2026-10-13, against an average of 90.5% for October across 3 years of readings (-3.5 points).
Drought Monitor at this site · 6 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: 2026-10-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 41.838, -79.004 · Open in Google Maps
About Allegheny Reservoir
As of October 13, 2026, Allegheny Reservoir is filled to 87.0% of its total capacity, holding roughly 615 hm³ of water out of a maximum 707 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 7.3 percentage points.
Across the readings we hold for Allegheny Reservoir — 329 data points between October 14, 2021 and October 13, 2026 — the level has ranged from a low of 55.5% (February 2, 2022) to a high of 105.0% (April 7, 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 lies within the Pennsylvania basin at 41.838°N, 79.004°W.
Key facts
- Current fill level
- 87.0%
- Water stored
- 615 hm³
- Total capacity
- 707 hm³
- 7-day change
- ▼ 7.3 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.838°N, 79.004°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 87.0% | 615 |
| 12 Oct 2026 | 88.2% | 624 |
| 11 Oct 2026 | 88.9% | 628 |
| 10 Oct 2026 | 90.3% | 638 |
| 9 Oct 2026 | 91.5% | 647 |
| 8 Oct 2026 | 92.2% | 652 |
| 7 Oct 2026 | 93.1% | 658 |
| 6 Oct 2026 | 94.3% | 667 |
| 5 Oct 2026 | 95.0% | 672 |
| 4 Oct 2026 | 96.3% | 680 |
| 3 Oct 2026 | 97.4% | 689 |
| 2 Oct 2026 | 98.5% | 696 |