Reservoir · Pennsylvania · United States · USACE CWMS
Tionesta Lake, PA
20.6% full
Capacity
55.72 hm³
Volume stored
12 hm³
Coordinates
41.474°N, 79.439°W
Last updated
2026-07-30
Current fill
20.6%vs 7 days ago
+0.2%gaining
vs 1 year ago
0.0%year-over-year
7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. 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. 41.474, -79.439 · Open in Google Maps
About Tionesta Lake, PA
As of July 30, 2026, Tionesta Lake, PA is filled to 20.6% of its total capacity, holding roughly 12 hm³ of water out of a maximum 56 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Tionesta Lake, PA — 327 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 16.3% (February 11, 2022) to a high of 100.0% (February 24, 2022). 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 41.474°N, 79.439°W.
Key facts
- Current fill level
- 20.6%
- Water stored
- 12 hm³
- Total capacity
- 56 hm³
- 7-day change
- ▲ 0.2 pts
- Year-on-year
- No change
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.474°N, 79.439°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 20.6% | 12 |
| 29 Jul 2026 | 20.4% | 11 |
| 28 Jul 2026 | 19.5% | 11 |
| 27 Jul 2026 | 19.5% | 11 |
| 26 Jul 2026 | 20.5% | 11 |
| 25 Jul 2026 | 21.9% | 12 |
| 24 Jul 2026 | 23.2% | 13 |
| 23 Jul 2026 | 23.4% | 13 |
| 22 Jul 2026 | 22.9% | 13 |
| 21 Jul 2026 | 21.4% | 12 |
| 20 Jul 2026 | 21.6% | 12 |
| 19 Jul 2026 | 21.1% | 12 |
Frequently asked questions
What is the current water level of Tionesta Lake, PA?
As of July 30, 2026, Tionesta Lake, PA is at 20.6% of its capacity, holding approximately 12 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Tionesta Lake, PA reservoir full?
No. As of July 30, 2026, Tionesta Lake, PA is low at 20.6% of its capacity, so it is not full.
Is the water level at Tionesta Lake, PA rising or falling?
The level at Tionesta Lake, PA has been broadly stable over the latest week on record (+0.2 points).
How much water can Tionesta Lake, PA hold?
Tionesta Lake, PA has a total capacity of 56 hm³.
Where is Tionesta Lake, PA reservoir located?
Tionesta Lake, PA is located in Pennsylvania, United States, within the Pennsylvania basin (coordinates 41.474°N, 79.439°W).
What is Tionesta Lake, PA used for?
Tionesta Lake, PA is used primarily for multiple purposes, and is managed by USACE.