About this river
Blackwater River is a 6.0 mile river near Outdoor New England | ONE in New Hampshire. Streamflow is measured at the USGS gauge Blackwater River near Webster, NH (site 01087000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1918 to 2026
Blackwater River typically runs highest in April, at a median 567 cfs, and lowest in September, at 41 cfs. The highest flow on record for any single day is 8,030 cfs, in 1936.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 114 | 76 to 182 | |
| February | 111 | 75 to 180 | |
| March | 195 | 136 to 379 | |
| April | 567 | 371 to 890 | |
| May | 251 | 175 to 419 | |
| June | 125 | 80 to 203 | |
| July | 57 | 39 to 89 | |
| August | 42 | 28 to 63 | |
| September | 41 | 27 to 70 | |
| October | 48 | 30 to 101 | |
| November | 116 | 60 to 213 | |
| December | 133 | 80 to 237 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 67 years of record. Statistics published by the US Geological Survey for Blackwater River near Webster, NH (site 01087000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Blackwater River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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