About this river
Willimantic River is a 3.3 mile river near Farmington River Trading Company in Connecticut. Streamflow is measured at the USGS gauge Willimantic River at Merrow RD. near Merrow, CT (site 01119382). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2009 to 2026
Willimantic River typically runs highest in April, at a median 255 cfs, and lowest in September, at 28 cfs. The highest flow on record for any single day is 3,330 cfs, in 2011.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 170 | 109 to 270 | |
| February | 172 | 119 to 241 | |
| March | 243 | 168 to 371 | |
| April | 255 | 178 to 393 | |
| May | 154 | 114 to 247 | |
| June | 79 | 53 to 143 | |
| July | 49 | 28 to 118 | |
| August | 44 | 19 to 102 | |
| September | 28 | 14 to 104 | |
| October | 50 | 23 to 138 | |
| November | 84 | 50 to 163 | |
| December | 161 | 90 to 283 |
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 17 years of record. Statistics published by the US Geological Survey for Willimantic River at Merrow RD. near Merrow, CT (site 01119382). 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 Willimantic 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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