About this river
East Branch Eightmile River is a 3.2 mile river near Black Hall Marina in Connecticut. Streamflow is measured at the USGS gauge East Branch Eightmile River near North Lyme, CT (site 01194500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1938 to 2026
East Branch Eightmile River typically runs highest in March, at a median 69 cfs, and lowest in September, at 4.2 cfs. The highest flow on record for any single day is 1,810 cfs, in 2010.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 44 | 30 to 72 | |
| February | 49 | 31 to 78 | |
| March | 69 | 47 to 104 | |
| April | 59 | 43 to 88 | |
| May | 43 | 29 to 66 | |
| June | 18 | 11 to 29 | |
| July | 6.5 | 3.4 to 16 | |
| August | 4.6 | 2.0 to 9.9 | |
| September | 4.2 | 1.9 to 11 | |
| October | 9.0 | 3.8 to 20 | |
| November | 24 | 12 to 47 | |
| December | 45 | 26 to 76 |
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 68 years of record. Statistics published by the US Geological Survey for East Branch Eightmile River near North Lyme, CT (site 01194500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show East Branch Eightmile 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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