COCKERMOUTH RIVER BELOW HARDY BROOK, AT GROTON, NH
USGS 01077400 · New Hampshire · reports discharge (live), gauge height
Reading COCKERMOUTH RIVER BELOW HARDY BROOK, AT GROTON, NH…
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USGS 01077400 · New Hampshire · reports discharge (live), gauge height
What the agencies suggest
Stand back from the shoreline and be aware of surroundingsRhode Island Department of Environmental Management
Wading and boating should be avoided if waters are running high and muddy and the streambed is not visiblePennsylvania Fish and Boat Commission
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
Much below normal for Nov 5 Rising · 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 3.96 to 7.75 ft³/s; latest 7.75 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, 10:00 PM EST | 7.75 | 1.38 | 16–41 |
| Nov 5, 9:05 PM EST | 7.39 | 1.37 | 16–41 |
| Nov 5, 8:10 PM EST | 7.03 | 1.36 | 16–41 |
| Nov 5, 7:15 PM EST | 6.35 | 1.34 | 16–41 |
| Nov 5, 6:20 PM EST | 6.02 | 1.33 | 16–41 |
| Nov 5, 5:25 PM EST | 5.39 | 1.31 | 16–41 |
| Nov 5, 4:30 PM EST | 5.39 | 1.31 | 16–41 |
| Nov 5, 3:35 PM EST | 5.39 | 1.31 | 16–41 |
| Nov 5, 2:40 PM EST | 5.39 | 1.31 | 16–41 |
| Nov 5, 1:45 PM EST | 5.08 | 1.3 | 16–41 |
| Nov 5, 12:50 PM EST | 4.79 | 1.29 | 16–41 |
| Nov 5, 11:55 AM EST | 4.5 | 1.28 | 16–41 |
| Nov 5, 11:00 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 10:05 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 9:10 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 8:15 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 7:20 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 6:25 AM EST | 3.96 | 1.26 | 16–41 |
| Nov 5, 5:30 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 4:35 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 3:40 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 2:45 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 1:50 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 12:55 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 5, 12:00 AM EST | 4.23 | 1.27 | 16–41 |
| Nov 4, 11:05 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 10:10 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 9:15 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 8:20 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 7:25 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 6:30 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 5:35 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 4:40 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 3:45 PM EST | 4.5 | 1.28 | 19–54 |
| Nov 4, 2:50 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 1:55 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 1:00 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 12:05 PM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 11:10 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 10:15 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 9:20 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 8:25 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 7:30 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 6:35 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 5:40 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 4:45 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 3:50 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 2:55 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 2:00 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 1:05 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 4, 12:10 AM EST | 4.23 | 1.27 | 19–54 |
| Nov 3, 11:15 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 10:20 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 9:25 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 8:30 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 7:35 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 6:40 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 5:45 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 4:50 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 3:55 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 3:00 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 2:05 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 1:10 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 12:15 PM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 11:20 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 10:25 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 9:30 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 8:35 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 7:40 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 6:45 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 5:50 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 4:55 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 4:00 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 3:05 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 2:10 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 1:15 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 3, 12:20 AM EST | 4.23 | 1.27 | 17–59 |
| Nov 2, 11:25 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 10:30 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 9:35 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 8:40 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 7:45 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 6:50 PM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 5:55 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 5:00 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 4:05 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 3:10 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 2:15 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 1:20 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 12:25 PM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 11:30 AM EST | 4.5 | 1.28 | 21–68 |
| Nov 2, 10:35 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 9:40 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 8:45 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 7:50 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 6:55 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 6:00 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 5:05 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 4:10 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 3:15 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 2:20 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 1:25 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 2, 12:30 AM EST | 4.23 | 1.27 | 21–68 |
| Nov 1, 11:35 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 10:40 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 9:45 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 8:50 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 7:55 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 7:00 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 6:05 PM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 5:10 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 4:15 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 3:20 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 2:25 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 1:30 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 12:35 PM EST | 4.5 | 1.28 | 26–65 |
| Nov 1, 11:40 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 10:45 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 9:50 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 8:55 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 8:00 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 7:05 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 6:10 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 5:15 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 4:20 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 3:25 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 2:30 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 1:35 AM EST | 4.23 | 1.27 | 26–65 |
| Nov 1, 1:40 AM EDT | 4.23 | 1.27 | 26–65 |
| Nov 1, 12:45 AM EDT | 4.23 | 1.27 | 26–65 |
| Oct 31, 11:50 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 10:55 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 10:00 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 9:05 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 8:10 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 7:15 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 6:20 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 5:25 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 4:30 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 3:35 PM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 2:40 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 1:45 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 12:50 PM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 11:55 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 11:00 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 10:05 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 9:10 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 8:15 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 7:20 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 6:25 AM EDT | 4.5 | 1.28 | 26–92 |
| Oct 31, 5:30 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 4:35 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 3:40 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 2:45 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 1:50 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 12:55 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 31, 12:00 AM EDT | 4.79 | 1.29 | 26–92 |
| Oct 30, 11:05 PM EDT | 4.79 | 1.29 | 31–73 |
| Oct 30, 10:10 PM EDT | 4.79 | 1.29 | 31–73 |
| Oct 30, 9:15 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 8:20 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 7:25 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 6:30 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 5:35 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 4:40 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 3:45 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 2:50 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 1:55 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 1:00 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 12:05 PM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 11:10 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 10:15 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 9:20 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 8:25 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 7:30 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 6:35 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 5:40 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 4:45 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 3:50 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 2:55 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 2:00 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 1:05 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 30, 12:10 AM EDT | 5.08 | 1.3 | 31–73 |
| Oct 29, 11:15 PM EDT | 5.08 | 1.3 | 25–69 |
| Oct 29, 11:00 PM EDT | 5.08 | 1.3 | 25–69 |
Map of USGS gauge 01077400 and the river around it
Where COCKERMOUTH RIVER BELOW HARDY BROOK, AT GROTON, NH sits.
No current water-temperature reading at this gauge, so no temperature guidance is given. Take a stream thermometer. New Hampshire Fish and Game Department publishes no water-temperature line for trout anglers that we found. The lines below are the National Park Service's, federal guidance, not a New Hampshire rule: 68°F.
Species list not on file for this gauge. Check the New Hampshire Fish and Game Department: New Hampshire trout stocking report · New Hampshire fishing laws and rules.
Normal for Nov 5: 16–41 ft³/s (middle half of 18 years of record). Now: 7.75 ft³/s, much below normal.
Much below normal for this date. 7.75 ft³/s is below the 10th percentile of daily mean flow for Nov 5 at this gauge over 18 years of record (2009–2026): 10th 8.3, 25th 16, median 26, 75th 41, 90th 110 ft³/s.
Daily means on record for Nov 5: lowest 4.47 ft³/s, highest 289 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).
Rising over 24 hours: discharge up 83.2%, from 4.23 to 7.75 ft³/s. 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.
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)Rising water. Rising over the last 24 hours (discharge up 83.2%). Keep your way back to the bank in sight and watch the level while you fish. “Rising” is our rule of thumb: more than 10% in discharge or 0.2 ft of gauge height in 24 hours, not a USGS or NWS class.
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 1.37 ft stage, 8 ft³/s at Nov 5, 9:00 PM EST (NWS gauge GRTN3; its stage datum can differ from the USGS gauge height).
Open the NWS gauge page · What the categories mean (National Weather Service)
Checked Nov 5, 10:18 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.