MEDIAN FLOW RATE · 7 DAY
6,805cfs 25.9% vs avg
Optimal band: 6,191–8,375 cfs
PERIOD HIGH
8,226cfs
PERIOD LOW
6,093cfs
RUNNABLE
88%
last 7 day in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
21.8in
≈ normal
21.78 in of precipitation so far this year — about average for this point in the season (normal 19.9 in).
YTD Total
21.8in
This year so far
Normal to Date
19.9in
30-yr average
Typical Range
15.0–24.1in
10th–90th pct YTD
Departure
+9%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 1.15" · normal 1.92" (1.0–3.0)
Feb: 0.48" · normal 1.88" (0.7–3.4)
Mar: 3.35" · normal 2.53" (1.3–4.0)
Apr: 7.97" · normal 4.26" (2.5–5.8)
May: 1.20" · normal 4.67" (1.9–7.2)
Jun: 6.55" · normal 4.14" (2.4–6.0)
Jul: 1.09" (so far)· normal 3.59" (1.4–5.3)
Aug: normal 3.54" (1.6–5.9)
Sep: normal 3.21" (1.4–5.7)
Oct: normal 2.96" (1.1–4.9)
Nov: normal 2.44" (0.9–4.2)
Dec: normal 2.18" (0.9–4.0)
Baseline 1991–2020 · Source: Open-Meteo11:55 PM
Your History · ROCK RIVER AT BYRON, IL
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Station Location
42.1222, -89.2554Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-05 00:00 UTC
Site #05440700·USGS
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