MEDIAN FLOW RATE · 1 YEAR
394cfs 50.9% vs avg
Optimal band: 31–43 cfs
PERIOD HIGH
7,575cfs
PERIOD LOW
1cfs
RUNNABLE
4%
last 1 year in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
21.6in
≈ normal
21.57 in of precipitation so far this year — about average for this point in the season (normal 21.28 in).
YTD Total
21.6in
This year so far
Normal to Date
21.3in
30-yr average
Typical Range
16.0–25.6in
10th–90th pct YTD
Departure
+1%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 1.31" · normal 2.24" (1.0–3.8)
Feb: 0.17" · normal 2.01" (0.7–3.1)
Mar: 4.43" · normal 2.88" (1.6–4.4)
Apr: 4.46" · normal 4.20" (2.7–6.3)
May: 1.50" · normal 4.68" (2.3–7.4)
Jun: 7.52" · normal 4.25" (2.2–7.7)
Jul: 2.18" (so far)· normal 3.82" (1.7–6.3)
Aug: normal 3.31" (1.7–5.1)
Sep: normal 2.94" (1.2–4.8)
Oct: normal 3.14" (1.4–5.8)
Nov: normal 2.84" (1.5–5.4)
Dec: normal 2.18" (1.2–3.9)
Baseline 1991–2020 · Source: Open-Meteo10:33 PM
Your History · VERMILION RIVER AT PONTIAC, IL
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Station Location
40.8778, -88.6360Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-08 00:00 UTC
Site #05554500·USGS
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