Reservoir · Pennsylvania · United States · USACE CWMS
Allegheny Reservoir, PA
98.3% full
Capacity
706.79 hm³
Volume stored
695 hm³
Coordinates
41.838°N, 79.004°W
Last updated
2026-07-30
Current fill
98.3%vs 7 days ago
+0.3%gaining
vs 1 year ago
-4.3%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. 41.838, -79.004 · Open in Google Maps
About Allegheny Reservoir, PA
As of July 30, 2026, Allegheny Reservoir, PA is filled to 98.3% of its total capacity, holding roughly 695 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 held broadly steady (+0.3 pts), and it is 4.3 points below its level on the same date a year earlier.
Across the readings we hold for Allegheny Reservoir, PA — 327 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 55.5% (February 2, 2022) to a high of 105.0% (August 19, 2021). On average the reservoir is fullest around April 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
- 98.3%
- Water stored
- 695 hm³
- Total capacity
- 707 hm³
- 7-day change
- ▲ 0.3 pts
- Year-on-year
- ▼ 4.3 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.838°N, 79.004°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 98.3% | 694 |
| 29 Jul 2026 | 98.0% | 692 |
| 28 Jul 2026 | 96.1% | 679 |
| 27 Jul 2026 | 95.4% | 674 |
| 26 Jul 2026 | 95.7% | 677 |
| 25 Jul 2026 | 95.9% | 678 |
| 24 Jul 2026 | 96.3% | 681 |
| 23 Jul 2026 | 96.7% | 683 |
| 22 Jul 2026 | 97.0% | 686 |
| 21 Jul 2026 | 97.2% | 687 |
| 20 Jul 2026 | 97.5% | 689 |
| 19 Jul 2026 | 97.7% | 691 |
Frequently asked questions
What is the current water level of Allegheny Reservoir, PA?
As of July 30, 2026, Allegheny Reservoir, PA is at 98.3% of its capacity, holding approximately 695 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Allegheny Reservoir, PA reservoir full?
Allegheny Reservoir, PA is essentially full, sitting at 98.3% of capacity as of July 30, 2026.
Is the water level at Allegheny Reservoir, PA rising or falling?
The level at Allegheny Reservoir, PA has been broadly stable over the latest week on record (+0.3 points).
How much water can Allegheny Reservoir, PA hold?
Allegheny Reservoir, PA has a total capacity of 707 hm³.
Where is Allegheny Reservoir, PA reservoir located?
Allegheny Reservoir, PA is located in Pennsylvania, United States, within the Pennsylvania basin (coordinates 41.838°N, 79.004°W).
What is Allegheny Reservoir, PA used for?
Allegheny Reservoir, PA is used primarily for multiple purposes, and is managed by USACE.