Reservoir · Pennsylvania · United States · USACE CWMS
Tionesta Lake
19.5% full
Capacity
57.4 hm³
Volume stored
11 hm³
Vs month average
83% of normal
Coordinates
41.474°N, 79.439°W
Last updated
2026-10-15
Current fill
19.5%vs 7 days ago
-0.8%losing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
83%of normal
19.5% full on 2026-10-15, against an average of 23.6% for October across 3 years of readings (-4.1 points).
Drought Monitor at this site · 13 October 2026
Nonenot in a drought category
Tionesta Lake'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. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. Last reading: 2026-10-15.
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
As of October 15, 2026, Tionesta Lake is filled to 19.5% of its total capacity, holding roughly 11 hm³ of water out of a maximum 57 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.8 pts).
Across the readings we hold for Tionesta Lake — 329 data points between October 16, 2021 and October 15, 2026 — the level has ranged from a low of 15.8% (February 11, 2022) to a high of 100.0% (February 24, 2022). On average the reservoir is fullest around February 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
- 19.5%
- Water stored
- 11 hm³
- Total capacity
- 57 hm³
- 7-day change
- ▼ 0.8 pts
- Primary use
- Multipurpose
- River basin
- Pennsylvania
- Operator
- USACE
- Coordinates
- 41.474°N, 79.439°W
- Last updated
- October 15, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 15 Oct 2026 | 19.5% | 11 |
| 14 Oct 2026 | 19.5% | 11 |
| 13 Oct 2026 | 19.6% | 11 |
| 12 Oct 2026 | 19.7% | 11 |
| 11 Oct 2026 | 19.8% | 11 |
| 10 Oct 2026 | 19.9% | 11 |
| 9 Oct 2026 | 20.1% | 12 |
| 8 Oct 2026 | 20.3% | 12 |
| 7 Oct 2026 | 20.4% | 12 |
| 6 Oct 2026 | 20.6% | 12 |
| 5 Oct 2026 | 20.6% | 12 |
| 4 Oct 2026 | 20.6% | 12 |