Blue Marsh Lake Water Level Today
Pennsylvania · near Reading · At full pool
- Elevation
- 289.62 ft
- From full pool
- +0.35 ft
- Percent of pool
- 101.2%
- 24-hour change
- +0.19 ft
- 7-day change
- +0.31 ft
- Reading
- Sep 21, 2026 · USACE
Last year at Blue Marsh Lake
Blue Marsh Lake is at full pool, 289.62 ft, up 0.19 ft in the last 24 hours. That puts the lake at 101.2 percent of its conservation pool. The top of the flood pool is 16.6 ft higher, at 306.27 ft.
Over the last 7 days the level rose 0.31 ft, and over 30 days it rose 0.09 ft. In the 400 days of readings on this page the high was 289.77 ft on Sep 4, 2026 and the low was 283.73 ft on Nov 7, 2025, a range of 6.04 ft.
The reading is the U.S. Army Corps of Engineers gauge at Blue Marsh Dam, near Reading, taken Sep 21, 2026 and referenced to the NAVD88 datum. This page is rebuilt once a day from the agency feed; it is not a live gauge, so during a fast rise or a scheduled release check the USACE page for hourly values.
Blue Marsh Lake pool elevations
| Current elevation | 289.62 ft |
|---|---|
| Full pool (top of conservation) | 289.27 ft |
| Top of flood pool | 306.27 ft |
| Bottom of conservation pool | 260.27 ft |
| Top of dam | 331.27 ft |
| Inflow | 135 cfs |
| Outflow | 171 cfs |
| 30-day change | +0.09 ft |
| 1-year high | 289.77 ft (Sep 4, 2026) |
| 1-year low | 283.73 ft (Nov 7, 2025) |
| Vertical datum | NAVD88 |
| Operating agency | U.S. Army Corps of Engineers, NAP district |
Source: U.S. Army Corps of Engineers. Read what full pool and flood pool mean.
More lakes in Pennsylvania
- Alvin R. Bush Lake 842.16 ft, +1.16 ft from full
- Aylesworth Creek Lake 1,108.07 ft, +0.07 ft from full
- Beltzville Lake 627.67 ft, +0.33 ft from full
- Cowanesque Lake 1,080.47 ft, +0.47 ft from full
- Curwensville Lake 1,162.15 ft, +0.15 ft from full
- East Branch Clarion River Lake 1,655.01 ft, +4.23 ft from full
Blue Marsh Lake level questions
What is the water level of Blue Marsh Lake today?
Blue Marsh Lake is at 289.62 ft as of Sep 21, 2026, +0.35 ft relative to full pool (289.27 ft). The 24-hour change is +0.19 ft.
What is full pool at Blue Marsh Lake?
Full pool, the top of the conservation pool, is 289.27 ft (NAVD88). Above that, water is stored temporarily in the flood pool up to 306.27 ft. The bottom of the conservation pool is 260.27 ft.
Is Blue Marsh Lake rising or falling?
Over the last 24 hours the level is +0.19 ft; over 7 days it rose 0.31 ft, and over 30 days it rose 0.09 ft.
Where does this Blue Marsh Lake level come from?
From the U.S. Army Corps of Engineers (USACE) public data feed for Blue Marsh Dam. Lake Levels Today republishes the agency's daily value without adjustment and links to the source below.