Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.

About reservoirs in Pennsylvania

As of September 14, 2026, the reservoirs we track across Pennsylvania that report live levels hold roughly 1,219 hm³ of water — about 79.2% of their combined capacity. Taken together, Pennsylvania's reservoirs are within their normal operating range.

Across the region, 1 reservoir is at critically low levels and 2 are low. Woodcock Creek Lake is the fullest at 105.0%, while Union City Dam is the lowest at 0.7%.

Over the most recent week on record, 7 reservoirs rose and 2 reservoirs fell across Pennsylvania.

Storage figures for Pennsylvania come from USGS · USACE · BOR · CDEC; the most recent reading is from September 14, 2026. Each reservoir below links to its own page with full history and seasonal context.

Pennsylvania at a glance

Reservoirs tracked: 13
Average fill: 79.2%
Water stored: 1,219 hm³
Combined capacity: 1,539 hm³
At critically low levels: 1
Fullest: Woodcock Creek Lake (105.0%)
Lowest: Union City Dam (0.7%)
Last updated: September 14, 2026

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