About this river
Middle Branch Mousam River is a 4.6 mile river near Aquaholics Surf Shop in Maine. Streamflow is measured at the USGS gauge Mousam River near West Kennebunk, Maine (site 01069500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1940 to 2026
Middle Branch Mousam River typically runs highest in April, at a median 411 cfs, and lowest in August, at 41 cfs. The highest flow on record for any single day is 3,890 cfs, in 2010.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 170 | 107 to 237 | |
| February | 161 | 109 to 227 | |
| March | 260 | 179 to 390 | |
| April | 411 | 254 to 577 | |
| May | 196 | 130 to 315 | |
| June | 119 | 63 to 184 | |
| July | 59 | 28 to 109 | |
| August | 41 | 19 to 88 | |
| September | 46 | 15 to 97 | |
| October | 84 | 39 to 142 | |
| November | 122 | 62 to 218 | |
| December | 177 | 102 to 294 |
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 63 years of record. Statistics published by the US Geological Survey for Mousam River near West Kennebunk, Maine (site 01069500). 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 Middle Branch Mousam 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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