USGS · 01119382

WILLIMANTIC RIVER

USGS · 01119382LIVE

WILLIMANTIC RIVER AT MERROW RD. NEAR MERROW, CT

MANSFIELD, CT41.8240°N, -72.3128°W Updated 18 hr ago

FLOW RATE

129cfs

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

129cfs 42.7% vs avg

Optimal band: 68–92 cfs

PERIOD HIGH

1,342cfs

PERIOD LOW

18cfs

RUNNABLE

20%

last 1 year in band

Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

25.5in

≈ normal

25.49 in of precipitation so far this year — about average for this point in the season (normal 22.36 in).

YTD Total

25.5in

This year so far

Normal to Date

22.4in

30-yr average

Typical Range

17.6–26.4in

10th–90th pct YTD

Departure

+14%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 3.28" · normal 3.47" (2.2–5.5)

Jan

Feb: 2.04" · normal 3.08" (1.7–4.6)

Feb

Mar: 5.57" · normal 4.14" (2.1–6.6)

Mar

Apr: 3.41" · normal 3.67" (2.0–6.0)

Apr

May: 3.84" · normal 3.22" (2.0–4.4)

May

Jun: 3.88" · normal 3.88" (1.8–6.7)

Jun

Jul: 3.47" (so far)· normal 3.60" (1.7–6.1)

Jul

Aug: normal 4.07" (2.4–7.0)

Aug

Sep: normal 3.95" (1.4–7.9)

Sep

Oct: normal 4.12" (1.2–6.8)

Oct

Nov: normal 3.48" (1.7–4.8)

Nov

Dec: normal 4.17" (2.2–6.8)

Dec

Baseline 1991–2020 · Source: Open-Meteo03:47 PM

Your History · WILLIMANTIC RIVER AT MERROW RD. NEAR MERROW, CT

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Station Location

41.8240, -72.3128

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DATA · USGS · NOAA · NWSUPDATED 2026-07-09 00:00 UTC

Site #01119382·USGS

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