About this river
Mystic River is a 3.0 mile river near Paddle Boston: Allston Brighton in Massachusetts. Streamflow is measured at the USGS gauge Alewife Brook near Arlington, MA (site 01103025). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2006 to 2025
Mystic River typically runs highest in April, at a median 11 cfs, and lowest in September, at 4.3 cfs. The highest flow on record for any single day is 180 cfs, in 2010.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 9.8 | 7.9 to 13 | |
| February | 9.2 | 7.5 to 12 | |
| March | 11 | 8.1 to 15 | |
| April | 11 | 8.0 to 16 | |
| May | 8.5 | 6.6 to 11 | |
| June | 7.4 | 5.4 to 11 | |
| July | 6.2 | 4.0 to 9.7 | |
| August | 5.0 | 3.5 to 7.5 | |
| September | 4.3 | 3.3 to 8.1 | |
| October | 5.4 | 3.6 to 10 | |
| November | 7.0 | 4.5 to 11 | |
| December | 9.5 | 6.4 to 14 |
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 19 years of record. Statistics published by the US Geological Survey for Alewife Brook near Arlington, MA (site 01103025). 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 Mystic River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
