Reservoir · Pennsylvania · United States · USACE CWMS
Union City Dam
3.6% full
Capacity
115.95 hm³
Volume stored
4 hm³
Coordinates
41.921°N, 79.901°W
Last updated
2026-09-11
Current fill
3.6%vs 7 days ago
-5.0%losing
vs 1 year ago
N/A7-day trend
↓falling
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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 41.921, -79.901 · Open in Google Maps
About Union City Dam
As of September 11, 2026, Union City Dam is filled to 3.6% of its total capacity, holding roughly 4 hm³ of water out of a maximum 116 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 5.0 percentage points.
Across the readings we hold for Union City Dam — 324 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 0.1% (October 2, 2021) to a high of 30.7% (February 24, 2022). On average the reservoir is fullest around February and at its lowest around July.
It is operated by USACE primarily for multiple purposes. It lies within the Pennsylvania basin at 41.921°N, 79.901°W.
Key facts
- Current fill level
- 3.6%
- Water stored
- 4 hm³
- Total capacity
- 116 hm³
- 7-day change
- ▼ 5.0 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.921°N, 79.901°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 3.6% | 4 |
| 10 Sep 2026 | 3.5% | 4 |
| 9 Sep 2026 | 2.7% | 3 |
| 8 Sep 2026 | 4.3% | 5 |
| 7 Sep 2026 | 5.9% | 7 |
| 6 Sep 2026 | 7.6% | 9 |
| 5 Sep 2026 | 9.0% | 10 |
| 4 Sep 2026 | 8.6% | 10 |
| 3 Sep 2026 | 5.8% | 7 |
| 2 Sep 2026 | 1.5% | 2 |
| 1 Sep 2026 | 0.5% | 1 |
| 31 Aug 2026 | 0.3% | 0 |