East Branch Penobscot River at Grindstone, Maine
USGS Site No: 01029500 • East. Branch. Penobscot River • Penobscot County, ME
East Branch Penobscot River at Grindstone, Maine on the East. Branch. Penobscot River is currently at 1,230 cfs (Normal — 25th percentile for this date) . Gage height: 5.56 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 859 | |
| 25th | Low threshold | 1,220 | |
| 50th (Median) | Normal (median) | 1,880 | Today: 1,230 cfs |
| 75th | High threshold | 2,740 | |
| 95th | Very High threshold | 5,710 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 1,330 | — |
| May 27, 2026 | 1,500 | — |
| May 26, 2026 | 1,640 | — |
| May 25, 2026 | 1,350 | — |
| May 24, 2026 | 1,420 | — |
| May 23, 2026 | 1,640 | — |
| May 22, 2026 | 1,930 | — |
| May 21, 2026 | 2,230 | — |
| May 20, 2026 | 2,400 | — |
| May 19, 2026 | 2,670 | — |
| May 18, 2026 | 2,910 | — |
| May 17, 2026 | 3,080 | — |
| May 16, 2026 | 3,230 | — |
| May 15, 2026 | 3,470 | — |
| Apr 21, 2026 | 6,640 | — |
| Apr 20, 2026 | 7,380 | — |
| Apr 19, 2026 | 7,160 | — |
| Apr 18, 2026 | 7,700 | — |
| Apr 17, 2026 | 7,820 | — |
| Apr 16, 2026 | 7,130 | — |
| Apr 15, 2026 | 6,170 | — |
| Apr 14, 2026 | 4,020 | — |
| Apr 13, 2026 | 3,410 | — |
| Apr 12, 2026 | 3,520 | — |
| Apr 11, 2026 | 3,030 | — |
| Apr 10, 2026 | 2,350 | — |
| Apr 9, 2026 | 2,080 | — |
| Apr 8, 2026 | 2,220 | — |
| Apr 7, 2026 | 2,540 | — |
| Apr 6, 2026 | 2,780 | — |
Station Information
- USGS Site No
- 01029500
- State
- ME
- County
- Penobscot County
- Coordinates
- 45.7303, -68.5894
- Drainage Area
- 837 mi²
- Datum (ft)
- 294.1
- HUC Code
- 01020002
Flood Stage Thresholds
- Action Stage
- 11.5 ft
- Flood Stage
- 14.0 ft
- Moderate Flood
- 16.0 ft
- Major Flood
- 17.0 ft
Currently 8.44 ft below flood stage.
Recent Extremes
- Max discharge
-
7,820 cfsApr 17, 2026
- Min discharge
-
317 cfsOct 7, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Wytopitlock Stream Near Wytopitlock MaineNormal20.9 mi · 50 cfs
-
Mattawamkeag River Near Mattawamkeag, MaineNormal20.9 mi · 1,790 cfs
-
Seboeis River Near Shin Pond, MaineNormal28.6 mi · 252 cfs
-
East. Branch. Penobscot River Below Grand Lake MatagamonVery High29.6 mi · 398 cfs
-
Penobscot River at West Enfield, MaineNormal34.3 mi · 8,710 cfs