MERRIMACK RIVER BL CONCORD RIVER AT LOWELL, MA
USGS 01100000 · Massachusetts · reports discharge (live), gauge height
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USGS 01100000 · Massachusetts · reports discharge (live), gauge height
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, 10:30 PM EST · provisional USGS data
Below normal for Nov 5 Steady · 24 h Below NWS action stage
Discharge, last 7 days: 169 readings from Oct 29, 11:30 PM EDT to Nov 5, 10:30 PM EST; ranging 1,410 to 2,940 ft³/s; latest 1,950 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) | Normal, 25th–75th (ft³/s) |
|---|---|---|---|
| Nov 5, 10:30 PM EST | 1,950 | 42 | 3,080–8,260 |
| Nov 5, 9:30 PM EST | 1,930 | 42 | 3,080–8,260 |
| Nov 5, 8:30 PM EST | 1,970 | 42 | 3,080–8,260 |
| Nov 5, 7:30 PM EST | 1,910 | 42 | 3,080–8,260 |
| Nov 5, 6:30 PM EST | 1,970 | 42 | 3,080–8,260 |
| Nov 5, 5:30 PM EST | 2,450 | 42.2 | 3,080–8,260 |
| Nov 5, 4:30 PM EST | 2,270 | 42.2 | 3,080–8,260 |
| Nov 5, 3:30 PM EST | 1,770 | 41.9 | 3,080–8,260 |
| Nov 5, 2:30 PM EST | 1,660 | 41.9 | 3,080–8,260 |
| Nov 5, 1:30 PM EST | 1,620 | 41.8 | 3,080–8,260 |
| Nov 5, 12:30 PM EST | 1,640 | 41.8 | 3,080–8,260 |
| Nov 5, 11:30 AM EST | 1,640 | 41.8 | 3,080–8,260 |
| Nov 5, 10:30 AM EST | 1,670 | 41.9 | 3,080–8,260 |
| Nov 5, 9:30 AM EST | 1,730 | 41.9 | 3,080–8,260 |
| Nov 5, 8:30 AM EST | 1,730 | 41.9 | 3,080–8,260 |
| Nov 5, 7:30 AM EST | 1,810 | 41.9 | 3,080–8,260 |
| Nov 5, 6:30 AM EST | 1,910 | 42 | 3,080–8,260 |
| Nov 5, 5:30 AM EST | 1,930 | 42 | 3,080–8,260 |
| Nov 5, 4:30 AM EST | 1,930 | 42 | 3,080–8,260 |
| Nov 5, 3:30 AM EST | 1,930 | 42 | 3,080–8,260 |
| Nov 5, 2:30 AM EST | 1,950 | 42 | 3,080–8,260 |
| Nov 5, 1:30 AM EST | 2,010 | 42 | 3,080–8,260 |
| Nov 5, 12:30 AM EST | 2,050 | 42.1 | 3,080–8,260 |
| Nov 4, 11:30 PM EST | 2,090 | 42.1 | 2,590–9,020 |
| Nov 4, 10:30 PM EST | 2,130 | 42.1 | 2,590–9,020 |
| Nov 4, 9:30 PM EST | 2,230 | 42.1 | 2,590–9,020 |
| Nov 4, 8:30 PM EST | 2,230 | 42.1 | 2,590–9,020 |
| Nov 4, 7:30 PM EST | 2,250 | 42.2 | 2,590–9,020 |
| Nov 4, 6:30 PM EST | 2,250 | 42.2 | 2,590–9,020 |
| Nov 4, 5:30 PM EST | 2,130 | 42.1 | 2,590–9,020 |
| Nov 4, 4:30 PM EST | 1,950 | 42 | 2,590–9,020 |
| Nov 4, 3:30 PM EST | 1,600 | 41.8 | 2,590–9,020 |
| Nov 4, 2:30 PM EST | 1,480 | 41.8 | 2,590–9,020 |
| Nov 4, 1:30 PM EST | 1,470 | 41.7 | 2,590–9,020 |
| Nov 4, 12:30 PM EST | 1,420 | 41.7 | 2,590–9,020 |
| Nov 4, 11:30 AM EST | 1,690 | 41.9 | 2,590–9,020 |
| Nov 4, 10:30 AM EST | 1,910 | 42 | 2,590–9,020 |
| Nov 4, 9:30 AM EST | 1,910 | 42 | 2,590–9,020 |
| Nov 4, 8:30 AM EST | 1,910 | 42 | 2,590–9,020 |
| Nov 4, 7:30 AM EST | 1,910 | 42 | 2,590–9,020 |
| Nov 4, 6:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 5:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 4:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 3:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 2:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 1:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 4, 12:30 AM EST | 1,930 | 42 | 2,590–9,020 |
| Nov 3, 11:30 PM EST | 1,930 | 42 | 2,600–7,860 |
| Nov 3, 10:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 9:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 8:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 7:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 6:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 5:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 4:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 3:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 2:30 PM EST | 1,950 | 42 | 2,600–7,860 |
| Nov 3, 1:30 PM EST | 1,850 | 42 | 2,600–7,860 |
| Nov 3, 12:30 PM EST | 1,850 | 42 | 2,600–7,860 |
| Nov 3, 11:30 AM EST | 1,850 | 42 | 2,600–7,860 |
| Nov 3, 10:30 AM EST | 1,850 | 42 | 2,600–7,860 |
| Nov 3, 9:30 AM EST | 1,850 | 42 | 2,600–7,860 |
| Nov 3, 8:30 AM EST | 1,750 | 41.9 | 2,600–7,860 |
| Nov 3, 7:30 AM EST | 1,710 | 41.9 | 2,600–7,860 |
| Nov 3, 6:30 AM EST | 1,690 | 41.9 | 2,600–7,860 |
| Nov 3, 5:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 3, 4:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 3, 3:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 3, 2:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 3, 1:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 3, 12:30 AM EST | 1,670 | 41.9 | 2,600–7,860 |
| Nov 2, 11:30 PM EST | 1,710 | 41.9 | 2,480–7,360 |
| Nov 2, 10:30 PM EST | 1,870 | 42 | 2,480–7,360 |
| Nov 2, 9:30 PM EST | 2,070 | 42.1 | 2,480–7,360 |
| Nov 2, 8:30 PM EST | 2,320 | 42.2 | 2,480–7,360 |
| Nov 2, 7:30 PM EST | 2,360 | 42.2 | 2,480–7,360 |
| Nov 2, 6:30 PM EST | 2,380 | 42.2 | 2,480–7,360 |
| Nov 2, 5:30 PM EST | 2,420 | 42.2 | 2,480–7,360 |
| Nov 2, 4:30 PM EST | 2,620 | 42.3 | 2,480–7,360 |
| Nov 2, 3:30 PM EST | 2,490 | 42.3 | 2,480–7,360 |
| Nov 2, 2:30 PM EST | 2,300 | 42.2 | 2,480–7,360 |
| Nov 2, 1:30 PM EST | 2,050 | 42.1 | 2,480–7,360 |
| Nov 2, 12:30 PM EST | 2,110 | 42.1 | 2,480–7,360 |
| Nov 2, 11:30 AM EST | 1,660 | 41.9 | 2,480–7,360 |
| Nov 2, 10:30 AM EST | 1,970 | 42 | 2,480–7,360 |
| Nov 2, 9:30 AM EST | 1,990 | 42 | 2,480–7,360 |
| Nov 2, 8:30 AM EST | 1,990 | 42 | 2,480–7,360 |
| Nov 2, 7:30 AM EST | 1,990 | 42 | 2,480–7,360 |
| Nov 2, 6:30 AM EST | 2,010 | 42 | 2,480–7,360 |
| Nov 2, 5:30 AM EST | 2,050 | 42.1 | 2,480–7,360 |
| Nov 2, 4:30 AM EST | 2,150 | 42.1 | 2,480–7,360 |
| Nov 2, 3:30 AM EST | 2,210 | 42.1 | 2,480–7,360 |
| Nov 2, 2:30 AM EST | 2,190 | 42.1 | 2,480–7,360 |
| Nov 2, 1:30 AM EST | 2,070 | 42.1 | 2,480–7,360 |
| Nov 2, 12:30 AM EST | 2,030 | 42 | 2,480–7,360 |
| Nov 1, 11:30 PM EST | 1,990 | 42 | 2,760–7,500 |
| Nov 1, 10:30 PM EST | 1,990 | 42 | 2,760–7,500 |
| Nov 1, 9:30 PM EST | 1,990 | 42 | 2,760–7,500 |
| Nov 1, 8:30 PM EST | 1,970 | 42 | 2,760–7,500 |
| Nov 1, 7:30 PM EST | 1,950 | 42 | 2,760–7,500 |
| Nov 1, 6:30 PM EST | 1,970 | 42 | 2,760–7,500 |
| Nov 1, 5:30 PM EST | 1,970 | 42 | 2,760–7,500 |
| Nov 1, 4:30 PM EST | 2,010 | 42 | 2,760–7,500 |
| Nov 1, 3:30 PM EST | 2,110 | 42.1 | 2,760–7,500 |
| Nov 1, 2:30 PM EST | 2,210 | 42.1 | 2,760–7,500 |
| Nov 1, 1:30 PM EST | 2,300 | 42.2 | 2,760–7,500 |
| Nov 1, 12:30 PM EST | 2,190 | 42.1 | 2,760–7,500 |
| Nov 1, 11:30 AM EST | 2,340 | 42.2 | 2,760–7,500 |
| Nov 1, 10:30 AM EST | 1,950 | 42 | 2,760–7,500 |
| Nov 1, 9:30 AM EST | 1,750 | 41.9 | 2,760–7,500 |
| Nov 1, 8:30 AM EST | 1,890 | 42 | 2,760–7,500 |
| Nov 1, 7:30 AM EST | 2,070 | 42.1 | 2,760–7,500 |
| Nov 1, 6:30 AM EST | 2,190 | 42.1 | 2,760–7,500 |
| Nov 1, 5:30 AM EST | 2,190 | 42.1 | 2,760–7,500 |
| Nov 1, 4:30 AM EST | 1,990 | 42 | 2,760–7,500 |
| Nov 1, 3:30 AM EST | 1,930 | 42 | 2,760–7,500 |
| Nov 1, 2:30 AM EST | 2,050 | 42.1 | 2,760–7,500 |
| Nov 1, 1:30 AM EST | 2,190 | 42.1 | 2,760–7,500 |
| Nov 1, 1:30 AM EDT | 2,300 | 42.2 | 2,760–7,500 |
| Nov 1, 12:30 AM EDT | 2,230 | 42.1 | 2,760–7,500 |
| Oct 31, 11:30 PM EDT | 2,110 | 42.1 | 2,490–6,930 |
| Oct 31, 10:30 PM EDT | 2,010 | 42 | 2,490–6,930 |
| Oct 31, 9:30 PM EDT | 2,110 | 42.1 | 2,490–6,930 |
| Oct 31, 8:30 PM EDT | 2,210 | 42.1 | 2,490–6,930 |
| Oct 31, 7:30 PM EDT | 1,970 | 42 | 2,490–6,930 |
| Oct 31, 6:30 PM EDT | 1,580 | 41.8 | 2,490–6,930 |
| Oct 31, 5:30 PM EDT | 1,410 | 41.7 | 2,490–6,930 |
| Oct 31, 4:30 PM EDT | 1,540 | 41.8 | 2,490–6,930 |
| Oct 31, 3:30 PM EDT | 2,340 | 42.2 | 2,490–6,930 |
| Oct 31, 2:30 PM EDT | 2,400 | 42.2 | 2,490–6,930 |
| Oct 31, 1:30 PM EDT | 2,470 | 42.3 | 2,490–6,930 |
| Oct 31, 12:30 PM EDT | 2,750 | 42.4 | 2,490–6,930 |
| Oct 31, 11:30 AM EDT | 2,250 | 42.2 | 2,490–6,930 |
| Oct 31, 10:30 AM EDT | 2,070 | 42.1 | 2,490–6,930 |
| Oct 31, 9:30 AM EDT | 2,110 | 42.1 | 2,490–6,930 |
| Oct 31, 8:30 AM EDT | 2,130 | 42.1 | 2,490–6,930 |
| Oct 31, 7:30 AM EDT | 2,250 | 42.2 | 2,490–6,930 |
| Oct 31, 6:30 AM EDT | 2,470 | 42.3 | 2,490–6,930 |
| Oct 31, 5:30 AM EDT | 2,300 | 42.2 | 2,490–6,930 |
| Oct 31, 4:30 AM EDT | 2,360 | 42.2 | 2,490–6,930 |
| Oct 31, 3:30 AM EDT | 2,360 | 42.2 | 2,490–6,930 |
| Oct 31, 2:30 AM EDT | 2,250 | 42.2 | 2,490–6,930 |
| Oct 31, 1:30 AM EDT | 2,110 | 42.1 | 2,490–6,930 |
| Oct 31, 12:30 AM EDT | 2,110 | 42.1 | 2,490–6,930 |
| Oct 30, 11:30 PM EDT | 2,070 | 42.1 | 2,440–7,720 |
| Oct 30, 10:30 PM EDT | 2,090 | 42.1 | 2,440–7,720 |
| Oct 30, 9:30 PM EDT | 2,090 | 42.1 | 2,440–7,720 |
| Oct 30, 8:30 PM EDT | 2,130 | 42.1 | 2,440–7,720 |
| Oct 30, 7:30 PM EDT | 2,230 | 42.1 | 2,440–7,720 |
| Oct 30, 6:30 PM EDT | 2,420 | 42.2 | 2,440–7,720 |
| Oct 30, 5:30 PM EDT | 2,150 | 42.1 | 2,440–7,720 |
| Oct 30, 4:30 PM EDT | 2,150 | 42.1 | 2,440–7,720 |
| Oct 30, 3:30 PM EDT | 2,230 | 42.1 | 2,440–7,720 |
| Oct 30, 2:30 PM EDT | 2,380 | 42.2 | 2,440–7,720 |
| Oct 30, 1:30 PM EDT | 2,940 | 42.5 | 2,440–7,720 |
| Oct 30, 12:30 PM EDT | 2,550 | 42.3 | 2,440–7,720 |
| Oct 30, 11:30 AM EDT | 2,270 | 42.2 | 2,440–7,720 |
| Oct 30, 10:30 AM EDT | 2,550 | 42.3 | 2,440–7,720 |
| Oct 30, 9:30 AM EDT | 2,270 | 42.2 | 2,440–7,720 |
| Oct 30, 8:30 AM EDT | 1,750 | 41.9 | 2,440–7,720 |
| Oct 30, 7:30 AM EDT | 1,750 | 41.9 | 2,440–7,720 |
| Oct 30, 6:30 AM EDT | 1,950 | 42 | 2,440–7,720 |
| Oct 30, 5:30 AM EDT | 2,300 | 42.2 | 2,440–7,720 |
| Oct 30, 4:30 AM EDT | 2,320 | 42.2 | 2,440–7,720 |
| Oct 30, 3:30 AM EDT | 2,320 | 42.2 | 2,440–7,720 |
| Oct 30, 2:30 AM EDT | 2,320 | 42.2 | 2,440–7,720 |
| Oct 30, 1:30 AM EDT | 2,320 | 42.2 | 2,440–7,720 |
| Oct 30, 12:30 AM EDT | 2,320 | 42.2 | 2,440–7,720 |
| Oct 29, 11:30 PM EDT | 2,340 | 42.2 | 2,510–7,430 |
Map of USGS gauge 01100000 and the river around it
Where MERRIMACK RIVER BL CONCORD RIVER AT LOWELL, MA sits, with 3 other gauges on the same river and our water's map point.
No current water-temperature reading at this gauge, so no temperature guidance is given. Take a stream thermometer. MassWildlife publishes no water-temperature line for trout anglers that we found. The lines below are the National Park Service's, federal guidance, not a Massachusetts rule: 68°F.
Normal for Nov 5: 3,080–8,260 ft³/s (middle half of 103 years of record). Now: 1,950 ft³/s, below normal.
Below normal for this date. 1,950 ft³/s is between the 10th and 25th percentiles of daily mean flow for Nov 5 at this gauge over 103 years of record (1924–2026): 10th 1,870, 25th 3,080, median 4,430, 75th 8,260, 90th 15,200 ft³/s.
Daily means on record for Nov 5: lowest 444 ft³/s, highest 66,200 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 (−8.5% 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.
This gauge is on the same river as our page for Merrimack River, but no agency page we read lists its species.
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)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 42 ft stage, 1,920 ft³/s at Nov 5, 9:30 PM EST (NWS gauge LOWM3; its stage datum can differ from the USGS gauge height).
NWS river forecast forecast issued Nov 5, 10:32 AM EST. Highest point: 42.2 ft, 2,350 ft³/s on Nov 7, 1:00 AM EST (Below NWS action stage).
| Day | Stage | Flow |
|---|---|---|
| Thu, Nov 5 | 41.9 ft | 1,740 ft³/s |
| Fri, Nov 6 | 42.1 ft | 2,140 ft³/s |
| Sat, Nov 7 | 42.2 ft | 2,350 ft³/s |
| Sun, Nov 8 | 42.2 ft | 2,350 ft³/s |
Open the NWS gauge page · What the categories mean (National Weather Service)
Checked Nov 5, 10:53 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.