POTOMAC RIVER AT POINT OF ROCKS, MD
USGS 01638500 · Maryland · reports discharge (live), gauge height, water temperature, dissolved oxygen, pH, turbidity, specific conductance
Reading POTOMAC RIVER AT POINT OF ROCKS, MD…
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USGS 01638500 · Maryland · reports discharge (live), gauge height, water temperature, dissolved oxygen, pH, turbidity, specific conductance
What the agencies suggest
Carry a pocket thermometer to monitor water temperatureNational Park Service
General guidance from the readings and the published lines named above, not a fishing forecast. Local rules and closures come first.
Reading Nov 5, 10:00 PM EST · provisional USGS data
Below normal for Nov 5 Steady · 24 h Below NWS action stage
Discharge, last 7 days: 185 readings from Oct 29, 11:00 PM EDT to Nov 5, 10:00 PM EST; ranging 1,310 to 2,050 ft³/s; latest 1,330 ft³/s; shaded band: typical range (25th–75th percentile) for each date.
USGS provisional data may be revised. Source: USGS instantaneous values.
| Time | Discharge (ft³/s) | Gauge height (ft) | Water temp (°F) | Normal, 25th–75th (ft³/s) |
|---|---|---|---|---|
| Nov 5, 10:00 PM EST | 1,330 | 1.08 | 64.4 | 1,860–6,020 |
| Nov 5, 9:05 PM EST | 1,310 | 1.07 | 64.4 | 1,860–6,020 |
| Nov 5, 8:10 PM EST | 1,310 | 1.07 | 64.4 | 1,860–6,020 |
| Nov 5, 7:15 PM EST | 1,330 | 1.08 | 64.4 | 1,860–6,020 |
| Nov 5, 6:20 PM EST | 1,330 | 1.08 | 64.2 | 1,860–6,020 |
| Nov 5, 5:25 PM EST | 1,350 | 1.09 | 64.2 | 1,860–6,020 |
| Nov 5, 4:30 PM EST | 1,380 | 1.11 | 64.4 | 1,860–6,020 |
| Nov 5, 3:35 PM EST | 1,420 | 1.13 | 64.4 | 1,860–6,020 |
| Nov 5, 2:40 PM EST | 1,460 | 1.15 | 64 | 1,860–6,020 |
| Nov 5, 1:45 PM EST | 1,500 | 1.17 | 63.7 | 1,860–6,020 |
| Nov 5, 12:50 PM EST | 1,560 | 1.2 | 63.3 | 1,860–6,020 |
| Nov 5, 11:55 AM EST | 1,620 | 1.23 | 62.6 | 1,860–6,020 |
| Nov 5, 11:00 AM EST | 1,660 | 1.25 | 61.9 | 1,860–6,020 |
| Nov 5, 10:05 AM EST | 1,700 | 1.27 | 61.5 | 1,860–6,020 |
| Nov 5, 9:10 AM EST | 1,740 | 1.29 | 61.3 | 1,860–6,020 |
| Nov 5, 8:15 AM EST | 1,760 | 1.3 | 61.2 | 1,860–6,020 |
| Nov 5, 7:20 AM EST | 1,780 | 1.31 | 61.2 | 1,860–6,020 |
| Nov 5, 6:25 AM EST | 1,780 | 1.31 | 61.2 | 1,860–6,020 |
| Nov 5, 5:30 AM EST | 1,780 | 1.31 | 61.2 | 1,860–6,020 |
| Nov 5, 4:35 AM EST | 1,740 | 1.29 | 61.2 | 1,860–6,020 |
| Nov 5, 3:40 AM EST | 1,720 | 1.28 | 61.3 | 1,860–6,020 |
| Nov 5, 2:45 AM EST | 1,660 | 1.25 | 61.3 | 1,860–6,020 |
| Nov 5, 1:50 AM EST | 1,600 | 1.22 | 61.5 | 1,860–6,020 |
| Nov 5, 12:55 AM EST | 1,520 | 1.18 | 61.5 | 1,860–6,020 |
| Nov 5, 12:00 AM EST | 1,440 | 1.14 | 61.5 | 1,860–6,020 |
| Nov 4, 11:05 PM EST | 1,380 | 1.11 | 61.5 | 1,860–6,130 |
| Nov 4, 10:10 PM EST | 1,350 | 1.09 | 61.3 | 1,860–6,130 |
| Nov 4, 9:15 PM EST | 1,330 | 1.08 | 61.2 | 1,860–6,130 |
| Nov 4, 8:20 PM EST | 1,330 | 1.08 | 61.2 | 1,860–6,130 |
| Nov 4, 7:25 PM EST | 1,330 | 1.08 | 61 | 1,860–6,130 |
| Nov 4, 6:30 PM EST | 1,350 | 1.09 | 60.8 | 1,860–6,130 |
| Nov 4, 5:35 PM EST | 1,380 | 1.11 | 61 | 1,860–6,130 |
| Nov 4, 4:40 PM EST | 1,400 | 1.12 | 61 | 1,860–6,130 |
| Nov 4, 3:45 PM EST | 1,440 | 1.14 | 61.2 | 1,860–6,130 |
| Nov 4, 2:50 PM EST | 1,500 | 1.17 | 61 | 1,860–6,130 |
| Nov 4, 1:55 PM EST | 1,540 | 1.19 | 60.3 | 1,860–6,130 |
| Nov 4, 1:00 PM EST | 1,580 | 1.21 | 59.5 | 1,860–6,130 |
| Nov 4, 12:05 PM EST | 1,620 | 1.23 | 58.6 | 1,860–6,130 |
| Nov 4, 11:10 AM EST | 1,680 | 1.26 | 57.6 | 1,860–6,130 |
| Nov 4, 10:15 AM EST | 1,720 | 1.28 | 56.7 | 1,860–6,130 |
| Nov 4, 9:20 AM EST | 1,760 | 1.3 | 56.5 | 1,860–6,130 |
| Nov 4, 8:25 AM EST | 1,800 | 1.32 | 56.5 | 1,860–6,130 |
| Nov 4, 7:30 AM EST | 1,820 | 1.33 | 56.7 | 1,860–6,130 |
| Nov 4, 6:35 AM EST | 1,840 | 1.34 | 57 | 1,860–6,130 |
| Nov 4, 5:40 AM EST | 1,820 | 1.33 | 57.2 | 1,860–6,130 |
| Nov 4, 4:45 AM EST | 1,800 | 1.32 | 57.6 | 1,860–6,130 |
| Nov 4, 3:50 AM EST | 1,740 | 1.29 | 57.9 | 1,860–6,130 |
| Nov 4, 2:55 AM EST | 1,680 | 1.26 | 58.3 | 1,860–6,130 |
| Nov 4, 2:00 AM EST | 1,620 | 1.23 | 58.5 | 1,860–6,130 |
| Nov 4, 1:05 AM EST | 1,540 | 1.19 | 58.6 | 1,860–6,130 |
| Nov 4, 12:10 AM EST | 1,460 | 1.15 | 58.6 | 1,860–6,130 |
| Nov 3, 11:15 PM EST | 1,420 | 1.13 | 58.8 | 1,780–5,930 |
| Nov 3, 10:20 PM EST | 1,380 | 1.11 | 59 | 1,780–5,930 |
| Nov 3, 9:25 PM EST | 1,360 | 1.1 | 59 | 1,780–5,930 |
| Nov 3, 8:30 PM EST | 1,360 | 1.1 | 59 | 1,780–5,930 |
| Nov 3, 7:35 PM EST | 1,360 | 1.1 | 59 | 1,780–5,930 |
| Nov 3, 6:40 PM EST | 1,380 | 1.11 | 59 | 1,780–5,930 |
| Nov 3, 5:45 PM EST | 1,400 | 1.12 | 59 | 1,780–5,930 |
| Nov 3, 4:50 PM EST | 1,440 | 1.14 | 59 | 1,780–5,930 |
| Nov 3, 3:55 PM EST | 1,460 | 1.15 | 59 | 1,780–5,930 |
| Nov 3, 3:00 PM EST | 1,520 | 1.18 | 58.8 | 1,780–5,930 |
| Nov 3, 2:05 PM EST | 1,560 | 1.2 | 58.3 | 1,780–5,930 |
| Nov 3, 1:10 PM EST | 1,620 | 1.23 | 57.4 | 1,780–5,930 |
| Nov 3, 12:15 PM EST | 1,660 | 1.25 | 56.5 | 1,780–5,930 |
| Nov 3, 11:20 AM EST | 1,720 | 1.28 | 55.4 | 1,780–5,930 |
| Nov 3, 10:25 AM EST | 1,760 | 1.3 | 54.7 | 1,780–5,930 |
| Nov 3, 9:30 AM EST | 1,800 | 1.32 | 54.3 | 1,780–5,930 |
| Nov 3, 8:35 AM EST | 1,840 | 1.34 | 54 | 1,780–5,930 |
| Nov 3, 7:40 AM EST | 1,890 | 1.36 | 54.1 | 1,780–5,930 |
| Nov 3, 6:45 AM EST | 1,890 | 1.36 | 54.5 | 1,780–5,930 |
| Nov 3, 5:50 AM EST | 1,890 | 1.36 | 54.7 | 1,780–5,930 |
| Nov 3, 4:55 AM EST | 1,870 | 1.35 | 55 | 1,780–5,930 |
| Nov 3, 4:00 AM EST | 1,840 | 1.34 | 55.2 | 1,780–5,930 |
| Nov 3, 3:05 AM EST | 1,800 | 1.32 | 55.6 | 1,780–5,930 |
| Nov 3, 2:10 AM EST | 1,740 | 1.29 | 55.8 | 1,780–5,930 |
| Nov 3, 1:15 AM EST | 1,700 | 1.27 | 56.1 | 1,780–5,930 |
| Nov 3, 12:20 AM EST | 1,660 | 1.25 | 56.3 | 1,780–5,930 |
| Nov 2, 11:25 PM EST | 1,620 | 1.23 | 56.5 | 1,830–5,550 |
| Nov 2, 10:30 PM EST | 1,600 | 1.22 | 56.5 | 1,830–5,550 |
| Nov 2, 9:35 PM EST | 1,600 | 1.22 | 56.7 | 1,830–5,550 |
| Nov 2, 8:40 PM EST | 1,580 | 1.21 | 56.7 | 1,830–5,550 |
| Nov 2, 7:45 PM EST | 1,580 | 1.21 | 56.8 | 1,830–5,550 |
| Nov 2, 6:50 PM EST | 1,580 | 1.21 | 56.8 | 1,830–5,550 |
| Nov 2, 5:55 PM EST | 1,580 | 1.21 | 56.8 | 1,830–5,550 |
| Nov 2, 5:00 PM EST | 1,580 | 1.21 | 56.7 | 1,830–5,550 |
| Nov 2, 4:05 PM EST | 1,580 | 1.21 | 56.8 | 1,830–5,550 |
| Nov 2, 3:10 PM EST | 1,600 | 1.22 | 56.8 | 1,830–5,550 |
| Nov 2, 2:15 PM EST | 1,600 | 1.22 | 56.8 | 1,830–5,550 |
| Nov 2, 1:20 PM EST | 1,620 | 1.23 | 56.5 | 1,830–5,550 |
| Nov 2, 12:25 PM EST | 1,620 | 1.23 | 55.6 | 1,830–5,550 |
| Nov 2, 11:30 AM EST | 1,640 | 1.24 | 54.9 | 1,830–5,550 |
| Nov 2, 10:35 AM EST | 1,660 | 1.25 | 54.3 | 1,830–5,550 |
| Nov 2, 9:40 AM EST | 1,680 | 1.26 | 54.3 | 1,830–5,550 |
| Nov 2, 8:45 AM EST | 1,680 | 1.26 | 54.3 | 1,830–5,550 |
| Nov 2, 7:50 AM EST | 1,700 | 1.27 | 54.5 | 1,830–5,550 |
| Nov 2, 6:55 AM EST | 1,720 | 1.28 | 54.7 | 1,830–5,550 |
| Nov 2, 6:00 AM EST | 1,720 | 1.28 | 55 | 1,830–5,550 |
| Nov 2, 5:05 AM EST | 1,720 | 1.28 | 55.4 | 1,830–5,550 |
| Nov 2, 4:10 AM EST | 1,700 | 1.27 | 55.8 | 1,830–5,550 |
| Nov 2, 3:15 AM EST | 1,700 | 1.27 | 56.1 | 1,830–5,550 |
| Nov 2, 2:20 AM EST | 1,700 | 1.27 | 56.3 | 1,830–5,550 |
| Nov 2, 1:25 AM EST | 1,700 | 1.27 | 56.7 | 1,830–5,550 |
| Nov 2, 12:30 AM EST | 1,680 | 1.26 | 57 | 1,830–5,550 |
| Nov 1, 11:35 PM EST | 1,680 | 1.26 | 57.2 | 1,820–5,790 |
| Nov 1, 10:40 PM EST | 1,680 | 1.26 | 57.6 | 1,820–5,790 |
| Nov 1, 9:45 PM EST | 1,660 | 1.25 | 57.6 | 1,820–5,790 |
| Nov 1, 8:50 PM EST | 1,660 | 1.25 | 57.7 | 1,820–5,790 |
| Nov 1, 7:55 PM EST | 1,640 | 1.24 | 57.7 | 1,820–5,790 |
| Nov 1, 7:00 PM EST | 1,640 | 1.24 | 57.9 | 1,820–5,790 |
| Nov 1, 6:05 PM EST | 1,640 | 1.24 | 58.1 | 1,820–5,790 |
| Nov 1, 5:10 PM EST | 1,640 | 1.24 | 58.3 | 1,820–5,790 |
| Nov 1, 4:15 PM EST | 1,640 | 1.24 | 58.5 | 1,820–5,790 |
| Nov 1, 3:20 PM EST | 1,660 | 1.25 | 58.3 | 1,820–5,790 |
| Nov 1, 2:25 PM EST | 1,660 | 1.25 | 57.9 | 1,820–5,790 |
| Nov 1, 1:30 PM EST | 1,680 | 1.26 | 57.2 | 1,820–5,790 |
| Nov 1, 12:35 PM EST | 1,700 | 1.27 | 56.8 | 1,820–5,790 |
| Nov 1, 11:40 AM EST | 1,720 | 1.28 | 56.3 | 1,820–5,790 |
| Nov 1, 10:45 AM EST | 1,740 | 1.29 | 55.8 | 1,820–5,790 |
| Nov 1, 9:50 AM EST | 1,760 | 1.3 | 55.4 | 1,820–5,790 |
| Nov 1, 8:55 AM EST | 1,780 | 1.31 | 55 | 1,820–5,790 |
| Nov 1, 8:00 AM EST | 1,800 | 1.32 | 55.2 | 1,820–5,790 |
| Nov 1, 7:05 AM EST | 1,820 | 1.33 | 55.4 | 1,820–5,790 |
| Nov 1, 6:10 AM EST | 1,820 | 1.33 | 55.8 | 1,820–5,790 |
| Nov 1, 5:15 AM EST | 1,820 | 1.33 | 55.9 | 1,820–5,790 |
| Nov 1, 4:20 AM EST | 1,820 | 1.33 | 56.3 | 1,820–5,790 |
| Nov 1, 3:25 AM EST | 1,820 | 1.33 | 56.5 | 1,820–5,790 |
| Nov 1, 2:30 AM EST | 1,800 | 1.32 | 56.8 | 1,820–5,790 |
| Nov 1, 1:35 AM EST | 1,780 | 1.31 | 57 | 1,820–5,790 |
| Nov 1, 1:40 AM EDT | 1,760 | 1.3 | 57.4 | 1,820–5,790 |
| Nov 1, 12:45 AM EDT | 1,720 | 1.28 | 57.6 | 1,820–5,790 |
| Oct 31, 11:50 PM EDT | 1,700 | 1.27 | 57.7 | 1,780–5,300 |
| Oct 31, 10:55 PM EDT | 1,660 | 1.25 | 57.9 | 1,780–5,300 |
| Oct 31, 10:00 PM EDT | 1,660 | 1.25 | 58.1 | 1,780–5,300 |
| Oct 31, 9:05 PM EDT | 1,640 | 1.24 | 58.3 | 1,780–5,300 |
| Oct 31, 8:10 PM EDT | 1,640 | 1.24 | 58.3 | 1,780–5,300 |
| Oct 31, 7:15 PM EDT | 1,640 | 1.24 | 58.3 | 1,780–5,300 |
| Oct 31, 6:20 PM EDT | 1,660 | 1.25 | 58.3 | 1,780–5,300 |
| Oct 31, 5:25 PM EDT | 1,660 | 1.25 | 58.5 | 1,780–5,300 |
| Oct 31, 4:30 PM EDT | 1,680 | 1.26 | 58.5 | 1,780–5,300 |
| Oct 31, 3:35 PM EDT | 1,700 | 1.27 | 58.3 | 1,780–5,300 |
| Oct 31, 2:40 PM EDT | 1,720 | 1.28 | 58.1 | 1,780–5,300 |
| Oct 31, 1:45 PM EDT | 1,740 | 1.29 | 57.6 | 1,780–5,300 |
| Oct 31, 12:50 PM EDT | 1,760 | 1.3 | 56.8 | 1,780–5,300 |
| Oct 31, 11:55 AM EDT | 1,780 | 1.31 | 56.3 | 1,780–5,300 |
| Oct 31, 11:00 AM EDT | 1,820 | 1.33 | 55.8 | 1,780–5,300 |
| Oct 31, 10:05 AM EDT | 1,840 | 1.34 | 55.6 | 1,780–5,300 |
| Oct 31, 9:10 AM EDT | 1,890 | 1.36 | 55.8 | 1,780–5,300 |
| Oct 31, 8:15 AM EDT | 1,930 | 1.38 | 56.1 | 1,780–5,300 |
| Oct 31, 7:20 AM EDT | 1,930 | 1.38 | 56.5 | 1,780–5,300 |
| Oct 31, 6:25 AM EDT | 1,960 | 1.39 | 57 | 1,780–5,300 |
| Oct 31, 5:30 AM EDT | 1,980 | 1.4 | 57.4 | 1,780–5,300 |
| Oct 31, 4:35 AM EDT | 1,960 | 1.39 | 57.9 | 1,780–5,300 |
| Oct 31, 3:40 AM EDT | 1,930 | 1.38 | 58.3 | 1,780–5,300 |
| Oct 31, 2:45 AM EDT | 1,910 | 1.37 | 58.8 | 1,780–5,300 |
| Oct 31, 1:50 AM EDT | 1,870 | 1.35 | 59.2 | 1,780–5,300 |
| Oct 31, 12:55 AM EDT | 1,820 | 1.33 | 59.5 | 1,780–5,300 |
| Oct 31, 12:00 AM EDT | 1,800 | 1.32 | 60.1 | 1,780–5,300 |
| Oct 30, 11:05 PM EDT | 1,760 | 1.3 | 60.3 | 1,760–5,300 |
| Oct 30, 10:10 PM EDT | 1,760 | 1.3 | 60.6 | 1,760–5,300 |
| Oct 30, 9:15 PM EDT | 1,740 | 1.29 | 60.8 | 1,760–5,300 |
| Oct 30, 8:20 PM EDT | 1,740 | 1.29 | 61 | 1,760–5,300 |
| Oct 30, 7:25 PM EDT | 1,760 | 1.3 | 61 | 1,760–5,300 |
| Oct 30, 6:30 PM EDT | 1,760 | 1.3 | 61.2 | 1,760–5,300 |
| Oct 30, 5:35 PM EDT | 1,760 | 1.3 | 61.2 | 1,760–5,300 |
| Oct 30, 4:40 PM EDT | 1,780 | 1.31 | 61.3 | 1,760–5,300 |
| Oct 30, 3:45 PM EDT | 1,820 | 1.33 | 61.3 | 1,760–5,300 |
| Oct 30, 2:50 PM EDT | 1,840 | 1.34 | 60.8 | 1,760–5,300 |
| Oct 30, 1:55 PM EDT | 1,820 | 1.33 | 60.3 | 1,760–5,300 |
| Oct 30, 1:00 PM EDT | 1,870 | 1.35 | 59.4 | 1,760–5,300 |
| Oct 30, 12:05 PM EDT | 1,890 | 1.36 | – | 1,760–5,300 |
| Oct 30, 11:10 AM EDT | 1,910 | 1.37 | – | 1,760–5,300 |
| Oct 30, 10:15 AM EDT | 1,960 | 1.39 | – | 1,760–5,300 |
| Oct 30, 9:20 AM EDT | 1,980 | 1.4 | – | 1,760–5,300 |
| Oct 30, 8:25 AM EDT | 2,000 | 1.41 | – | 1,760–5,300 |
| Oct 30, 7:30 AM EDT | 2,020 | 1.42 | – | 1,760–5,300 |
| Oct 30, 6:35 AM EDT | 2,020 | 1.42 | – | 1,760–5,300 |
| Oct 30, 5:40 AM EDT | 2,050 | 1.43 | – | 1,760–5,300 |
| Oct 30, 4:45 AM EDT | 2,020 | 1.42 | – | 1,760–5,300 |
| Oct 30, 3:50 AM EDT | 2,020 | 1.42 | – | 1,760–5,300 |
| Oct 30, 2:55 AM EDT | 2,000 | 1.41 | – | 1,760–5,300 |
| Oct 30, 2:00 AM EDT | 1,980 | 1.4 | – | 1,760–5,300 |
| Oct 30, 1:05 AM EDT | 1,930 | 1.38 | – | 1,760–5,300 |
| Oct 30, 12:10 AM EDT | 1,910 | 1.37 | – | 1,760–5,300 |
| Oct 29, 11:15 PM EDT | 1,870 | 1.35 | – | 1,760–5,260 |
| Oct 29, 11:00 PM EDT | 1,870 | 1.35 | – | 1,760–5,260 |
Water temperature, last 7 days: 170 readings from Oct 30, 12:30 PM EDT to Nov 5, 10:00 PM EST; ranging 54 to 64.4 °F; latest 64.4 °F.
USGS provisional data may be revised. Source: USGS instantaneous values.
| Time | Water temperature (°F) |
|---|---|
| Nov 5, 10:00 PM EST | 64.4 |
| Nov 5, 9:05 PM EST | 64.4 |
| Nov 5, 8:10 PM EST | 64.4 |
| Nov 5, 7:15 PM EST | 64.4 |
| Nov 5, 6:20 PM EST | 64.2 |
| Nov 5, 5:25 PM EST | 64.2 |
| Nov 5, 4:30 PM EST | 64.4 |
| Nov 5, 3:35 PM EST | 64.4 |
| Nov 5, 2:40 PM EST | 64 |
| Nov 5, 1:45 PM EST | 63.7 |
| Nov 5, 12:50 PM EST | 63.3 |
| Nov 5, 11:55 AM EST | 62.6 |
| Nov 5, 11:00 AM EST | 61.9 |
| Nov 5, 10:05 AM EST | 61.5 |
| Nov 5, 9:10 AM EST | 61.3 |
| Nov 5, 8:15 AM EST | 61.2 |
| Nov 5, 7:20 AM EST | 61.2 |
| Nov 5, 6:25 AM EST | 61.2 |
| Nov 5, 5:30 AM EST | 61.2 |
| Nov 5, 4:35 AM EST | 61.2 |
| Nov 5, 3:40 AM EST | 61.3 |
| Nov 5, 2:45 AM EST | 61.3 |
| Nov 5, 1:50 AM EST | 61.5 |
| Nov 5, 12:55 AM EST | 61.5 |
| Nov 5, 12:00 AM EST | 61.5 |
| Nov 4, 11:05 PM EST | 61.5 |
| Nov 4, 10:10 PM EST | 61.3 |
| Nov 4, 9:15 PM EST | 61.2 |
| Nov 4, 8:20 PM EST | 61.2 |
| Nov 4, 7:25 PM EST | 61 |
| Nov 4, 6:30 PM EST | 60.8 |
| Nov 4, 5:35 PM EST | 61 |
| Nov 4, 4:40 PM EST | 61 |
| Nov 4, 3:45 PM EST | 61.2 |
| Nov 4, 2:50 PM EST | 61 |
| Nov 4, 1:55 PM EST | 60.3 |
| Nov 4, 1:00 PM EST | 59.5 |
| Nov 4, 12:05 PM EST | 58.6 |
| Nov 4, 11:10 AM EST | 57.6 |
| Nov 4, 10:15 AM EST | 56.7 |
| Nov 4, 9:20 AM EST | 56.5 |
| Nov 4, 8:25 AM EST | 56.5 |
| Nov 4, 7:30 AM EST | 56.7 |
| Nov 4, 6:35 AM EST | 57 |
| Nov 4, 5:40 AM EST | 57.2 |
| Nov 4, 4:45 AM EST | 57.6 |
| Nov 4, 3:50 AM EST | 57.9 |
| Nov 4, 2:55 AM EST | 58.3 |
| Nov 4, 2:00 AM EST | 58.5 |
| Nov 4, 1:05 AM EST | 58.6 |
| Nov 4, 12:10 AM EST | 58.6 |
| Nov 3, 11:15 PM EST | 58.8 |
| Nov 3, 10:20 PM EST | 59 |
| Nov 3, 9:25 PM EST | 59 |
| Nov 3, 8:30 PM EST | 59 |
| Nov 3, 7:35 PM EST | 59 |
| Nov 3, 6:40 PM EST | 59 |
| Nov 3, 5:45 PM EST | 59 |
| Nov 3, 4:50 PM EST | 59 |
| Nov 3, 3:55 PM EST | 59 |
| Nov 3, 3:00 PM EST | 58.8 |
| Nov 3, 2:05 PM EST | 58.3 |
| Nov 3, 1:10 PM EST | 57.4 |
| Nov 3, 12:15 PM EST | 56.5 |
| Nov 3, 11:20 AM EST | 55.4 |
| Nov 3, 10:25 AM EST | 54.7 |
| Nov 3, 9:30 AM EST | 54.3 |
| Nov 3, 8:35 AM EST | 54 |
| Nov 3, 7:40 AM EST | 54.1 |
| Nov 3, 6:45 AM EST | 54.5 |
| Nov 3, 5:50 AM EST | 54.7 |
| Nov 3, 4:55 AM EST | 55 |
| Nov 3, 4:00 AM EST | 55.2 |
| Nov 3, 3:05 AM EST | 55.6 |
| Nov 3, 2:10 AM EST | 55.8 |
| Nov 3, 1:15 AM EST | 56.1 |
| Nov 3, 12:20 AM EST | 56.3 |
| Nov 2, 11:25 PM EST | 56.5 |
| Nov 2, 10:30 PM EST | 56.5 |
| Nov 2, 9:35 PM EST | 56.7 |
| Nov 2, 8:40 PM EST | 56.7 |
| Nov 2, 7:45 PM EST | 56.8 |
| Nov 2, 6:50 PM EST | 56.8 |
| Nov 2, 5:55 PM EST | 56.8 |
| Nov 2, 5:00 PM EST | 56.7 |
| Nov 2, 4:05 PM EST | 56.8 |
| Nov 2, 3:10 PM EST | 56.8 |
| Nov 2, 2:15 PM EST | 56.8 |
| Nov 2, 1:20 PM EST | 56.5 |
| Nov 2, 12:25 PM EST | 55.6 |
| Nov 2, 11:30 AM EST | 54.9 |
| Nov 2, 10:35 AM EST | 54.3 |
| Nov 2, 9:40 AM EST | 54.3 |
| Nov 2, 8:45 AM EST | 54.3 |
| Nov 2, 7:50 AM EST | 54.5 |
| Nov 2, 6:55 AM EST | 54.7 |
| Nov 2, 6:00 AM EST | 55 |
| Nov 2, 5:05 AM EST | 55.4 |
| Nov 2, 4:10 AM EST | 55.8 |
| Nov 2, 3:15 AM EST | 56.1 |
| Nov 2, 2:20 AM EST | 56.3 |
| Nov 2, 1:25 AM EST | 56.7 |
| Nov 2, 12:30 AM EST | 57 |
| Nov 1, 11:35 PM EST | 57.2 |
| Nov 1, 10:40 PM EST | 57.6 |
| Nov 1, 9:45 PM EST | 57.6 |
| Nov 1, 8:50 PM EST | 57.7 |
| Nov 1, 7:55 PM EST | 57.7 |
| Nov 1, 7:00 PM EST | 57.9 |
| Nov 1, 6:05 PM EST | 58.1 |
| Nov 1, 5:10 PM EST | 58.3 |
| Nov 1, 4:15 PM EST | 58.5 |
| Nov 1, 3:20 PM EST | 58.3 |
| Nov 1, 2:25 PM EST | 57.9 |
| Nov 1, 1:30 PM EST | 57.2 |
| Nov 1, 12:35 PM EST | 56.8 |
| Nov 1, 11:40 AM EST | 56.3 |
| Nov 1, 10:45 AM EST | 55.8 |
| Nov 1, 9:50 AM EST | 55.4 |
| Nov 1, 8:55 AM EST | 55 |
| Nov 1, 8:00 AM EST | 55.2 |
| Nov 1, 7:05 AM EST | 55.4 |
| Nov 1, 6:10 AM EST | 55.8 |
| Nov 1, 5:15 AM EST | 55.9 |
| Nov 1, 4:20 AM EST | 56.3 |
| Nov 1, 3:25 AM EST | 56.5 |
| Nov 1, 2:30 AM EST | 56.8 |
| Nov 1, 1:35 AM EST | 57 |
| Nov 1, 1:40 AM EDT | 57.4 |
| Nov 1, 12:45 AM EDT | 57.6 |
| Oct 31, 11:50 PM EDT | 57.7 |
| Oct 31, 10:55 PM EDT | 57.9 |
| Oct 31, 10:00 PM EDT | 58.1 |
| Oct 31, 9:05 PM EDT | 58.3 |
| Oct 31, 8:10 PM EDT | 58.3 |
| Oct 31, 7:15 PM EDT | 58.3 |
| Oct 31, 6:20 PM EDT | 58.3 |
| Oct 31, 5:25 PM EDT | 58.5 |
| Oct 31, 4:30 PM EDT | 58.5 |
| Oct 31, 3:35 PM EDT | 58.3 |
| Oct 31, 2:40 PM EDT | 58.1 |
| Oct 31, 1:45 PM EDT | 57.6 |
| Oct 31, 12:50 PM EDT | 56.8 |
| Oct 31, 11:55 AM EDT | 56.3 |
| Oct 31, 11:00 AM EDT | 55.8 |
| Oct 31, 10:05 AM EDT | 55.6 |
| Oct 31, 9:10 AM EDT | 55.8 |
| Oct 31, 8:15 AM EDT | 56.1 |
| Oct 31, 7:20 AM EDT | 56.5 |
| Oct 31, 6:25 AM EDT | 57 |
| Oct 31, 5:30 AM EDT | 57.4 |
| Oct 31, 4:35 AM EDT | 57.9 |
| Oct 31, 3:40 AM EDT | 58.3 |
| Oct 31, 2:45 AM EDT | 58.8 |
| Oct 31, 1:50 AM EDT | 59.2 |
| Oct 31, 12:55 AM EDT | 59.5 |
| Oct 31, 12:00 AM EDT | 60.1 |
| Oct 30, 11:05 PM EDT | 60.3 |
| Oct 30, 10:10 PM EDT | 60.6 |
| Oct 30, 9:15 PM EDT | 60.8 |
| Oct 30, 8:20 PM EDT | 61 |
| Oct 30, 7:25 PM EDT | 61 |
| Oct 30, 6:30 PM EDT | 61.2 |
| Oct 30, 5:35 PM EDT | 61.2 |
| Oct 30, 4:40 PM EDT | 61.3 |
| Oct 30, 3:45 PM EDT | 61.3 |
| Oct 30, 2:50 PM EDT | 60.8 |
| Oct 30, 1:55 PM EDT | 60.3 |
| Oct 30, 1:00 PM EDT | 59.4 |
| Oct 30, 12:30 PM EDT | 59 |
Map of USGS gauge 01638500 and the river around it
Where POTOMAC RIVER AT POINT OF ROCKS, MD sits, with 4 other gauges on the same river.
Normal for Nov 5: 1,860–6,020 ft³/s (middle half of 131 years of record). Now: 1,330 ft³/s, below normal.
Below normal for this date. 1,330 ft³/s is between the 10th and 25th percentiles of daily mean flow for Nov 5 at this gauge over 131 years of record (1896–2026): 10th 1,300, 25th 1,860, median 2,780, 75th 6,020, 90th 10,000 ft³/s.
Daily means on record for Nov 5: lowest 688 ft³/s, highest 83,100 ft³/s.
Classes as USGS labels them (hyswap: flow categories (WDFN_stats schema) (U.S. Geological Survey) ); percentiles from the USGS daily statistics (U.S. Geological Survey) (approved daily means; the reading is provisional and instantaneous).
Steady over 24 hours (−1.5% discharge). Rising or falling means a change of more than 10% in discharge (or 0.2 ft of gauge height) over 24 hours; our rule of thumb, not a USGS class.
Good trout temperatures. Water 64.4°F now; the highest in the last 24 hours was 64.4°F. That is under the 65°F Maryland DNR gives as preferred for trout (“Preferred temperatures, fishing is generally good”; “best chance for survival after release”). Water warms through the afternoon, so check again later in the day.
Trout Fishing Temperature Information (Maryland Department of Natural Resources)Species list not on file for this gauge. Check the Maryland Department of Natural Resources: Maryland trout stocking · Maryland fishing regulations.
Below NWS action stage. The National Weather Service reports this gauge below its action stage. That is not a statement that wading is safe.
Flood categories: action stage, minor, moderate and major flooding (National Weather Service)Turn Around Don't Drown. “A mere 6 inches of fast-moving flood water can knock over an adult.” No flow number makes a crossing safe; if in doubt, stay out.
Turn Around Don't Drown (National Weather Service)Dissolved oxygen 9.5 mg/L at Nov 5, 10:00 PM EST; 7-day range 8.5–12.4 mg/L
Enough oxygen for coldwater fish: 9.5 mg/L meets the 6.5 mg/L EPA sets for coldwater fish (other life stages; eggs and fry need a 8 mg/L minimum).
Quality Criteria for Water 1986 (“Gold Book”): dissolved oxygen, Table 1; pH (U.S. Environmental Protection Agency)pH 8.3 at Nov 5, 10:00 PM EST; 7-day range 8.2–8.8
Within EPA's freshwater range: pH 8.3 is within the 6.5–9 range EPA gives for freshwater aquatic life.
Quality Criteria for Water 1986 (“Gold Book”): dissolved oxygen, Table 1; pH (U.S. Environmental Protection Agency)Turbidity 1.5 FNU at Nov 5, 10:00 PM EST; 7-day range 0.8–2.2 FNU
Water clarity: Turbidity measures the relative clarity of water: higher means murkier. No agency publishes a fishing threshold for it; compare with this gauge's own recent readings.
Turbidity and Water (U.S. Geological Survey)Specific conductance 382 µS/cm at Nov 5, 10:00 PM EST; 7-day range 351–386 µS/cm
Dissolved ions: Specific conductance rises with the ions dissolved in the water. No fishing threshold is published for it; compare with this gauge's own recent readings.
Conductivity (Electrical Conductance) and Water (U.S. Geological Survey)Guidance from the readings above and the published thresholds named with each line; not a fishing forecast, a safety guarantee or a statement about access. Local rules and closures come first.
Below NWS action stage. The National Weather Service reports this gauge below its action stage. That is not a statement that wading is safe.
NWS observed 1.07 ft stage, 1,310 ft³/s at Nov 5, 8:55 PM EST (NWS gauge PORM2; its stage datum can differ from the USGS gauge height).
NWS river forecast forecast issued Nov 5, 9:59 AM EST. Highest point: 1.2 ft, 1,560 ft³/s on Nov 5, 1:00 PM EST (Below NWS action stage).
| Day | Stage | Flow |
|---|---|---|
| Thu, Nov 5 | 1.2 ft | 1,560 ft³/s |
| Fri, Nov 6 | 1.2 ft | 1,560 ft³/s |
| Sat, Nov 7 | 1.2 ft | 1,560 ft³/s |
| Sun, Nov 8 | 1.2 ft | 1,560 ft³/s |
Open the NWS gauge page · What the categories mean (National Weather Service)
Checked Nov 5, 10:19 PM EST; readings refresh at most every 15 minutes and statistics daily. Provisional USGS data can be revised. Conditions change: re-check before you go. This is general guidance, not a fishing forecast, a safety guarantee or a statement about access.