USGS · 01585200

WEST BRANCH

USGS · 01585200LIVE

WEST BRANCH HERRING RUN AT IDLEWYLDE, MD

TOWSON, MD39.3736°N, -76.5843°W Updated 8 hr ago

FLOW RATE

1cfs

AIR TEMP

73°F

WIND

4mph S

FISH INDEX

75SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 7 DAY

1cfs 0.3% vs avg

Optimal band: 1–1 cfs

PERIOD HIGH

21cfs

PERIOD LOW

1cfs

RUNNABLE

57%

last 7 day in band

Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

23.2in

≈ normal

23.16 in of precipitation so far this year — about average for this point in the season (normal 24.24 in).

YTD Total

23.2in

This year so far

Normal to Date

24.2in

30-yr average

Typical Range

19.3–29.9in

10th–90th pct YTD

Departure

-4%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 2.98" · normal 3.56" (2.2–5.3)

Jan

Feb: 2.04" · normal 3.21" (1.8–5.1)

Feb

Mar: 3.49" · normal 4.53" (2.1–6.8)

Mar

Apr: 2.82" · normal 3.85" (2.2–5.8)

Apr

May: 4.95" · normal 4.00" (1.8–6.5)

May

Jun: 3.81" · normal 3.86" (1.8–7.0)

Jun

Jul: 3.08" (so far)· normal 4.20" (1.9–7.1)

Jul

Aug: normal 3.88" (1.8–5.7)

Aug

Sep: normal 4.92" (1.7–7.7)

Sep

Oct: normal 4.09" (1.7–6.4)

Oct

Nov: normal 3.38" (1.5–5.4)

Nov

Dec: normal 4.31" (2.2–6.2)

Dec

Baseline 1991–2020 · Source: Open-Meteo08:37 AM

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Station Location

39.3736, -76.5843

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

Site #01585200·USGS

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