About this river
Flat Brook is a 3.7 mile river near Kayak East LLC in Pennsylvania. Streamflow is measured at the USGS gauge Flat Brook near Flatbrookville NJ (site 01440000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1924 to 2026
Flat Brook typically runs highest in March, at a median 163 cfs, and lowest in September, at 23 cfs. The highest flow on record for any single day is 6,310 cfs, in 1955.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 90 | 59 to 146 | |
| February | 101 | 68 to 151 | |
| March | 163 | 107 to 249 | |
| April | 149 | 102 to 225 | |
| May | 105 | 74 to 168 | |
| June | 61 | 40 to 96 | |
| July | 34 | 23 to 63 | |
| August | 24 | 16 to 48 | |
| September | 23 | 14 to 46 | |
| October | 28 | 16 to 66 | |
| November | 61 | 29 to 124 | |
| December | 90 | 51 to 156 |
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 103 years of record. Statistics published by the US Geological Survey for Flat Brook near Flatbrookville NJ (site 01440000). 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 Flat Brook'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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