MEDIAN FLOW RATE · 30 DAY
121cfs 43.2% vs avg
Optimal band: 31–43 cfs
PERIOD HIGH
228cfs
PERIOD LOW
27cfs
RUNNABLE
52%
last 30 day in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
22.2in
≈ normal
22.16 in of precipitation so far this year — about average for this point in the season (normal 23.6 in).
YTD Total
22.2in
This year so far
Normal to Date
23.6in
30-yr average
Typical Range
18.6–30.3in
10th–90th pct YTD
Departure
-6%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 2.60" · normal 3.56" (2.2–5.4)
Feb: 1.46" · normal 3.07" (1.9–4.9)
Mar: 4.64" · normal 4.18" (2.3–6.4)
Apr: 2.59" · normal 3.86" (2.0–6.0)
May: 3.08" · normal 3.76" (1.7–5.8)
Jun: 4.20" · normal 4.33" (2.2–7.2)
Jul: 3.60" (so far)· normal 4.06" (1.9–7.0)
Aug: normal 3.91" (1.2–6.1)
Sep: normal 4.46" (1.3–7.7)
Oct: normal 4.13" (1.6–6.4)
Nov: normal 3.28" (1.4–4.8)
Dec: normal 4.08" (2.0–5.9)
Baseline 1991–2020 · Source: Open-Meteo01:28 PM
Your History · South Branch Raritan River near High Bridge NJ
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Station Location
40.6778, -74.8792Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-07 00:00 UTC
Site #01396500·USGS
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