Skip to content
Angling Hubs

Flat Brook in New Jersey

River11.5 mi

Around here

Around Flat Brook

Valley View Group Campground1.8 miDelaware Water Gap National Recreati…1.1 mi2 mi

Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US

About this river

Flat Brook is an 11.5 mile river. 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.

Show the numbers
Typical flow by month at Flat Brook near Flatbrookville NJ, in cfs
MonthTypical (cfs)Usual range (cfs)
January9059 to 146
February10168 to 151
March163107 to 249
April149102 to 225
May10474 to 167
June6140 to 96
July3323 to 62
August2516 to 48
September2314 to 46
October2816 to 66
November6129 to 124
December9051 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.

Free widget

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.

Embed code

See every free widget you can put on your site, including live conditions and a 7 day forecast.