USGS · 01104480

STONY BROOK

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STONY BROOK RESERVOIR AT DAM NEAR WALTHAM, MA

WALTHAM, MA42.3557°N, -71.2651°W Updated 1 hr ago

FLOW RATE

0cfs

AIR TEMP

73°F

WIND

3mph SSE

FISH INDEX

81SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

0cfs 92.6% vs avg

Optimal band: 16–22 cfs

PERIOD HIGH

96cfs

PERIOD LOW

1cfs

RUNNABLE

14%

last 1 year in band

Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

19.9in

≈ normal

19.88 in of precipitation so far this year — about average for this point in the season (normal 21.81 in).

YTD Total

19.9in

This year so far

Normal to Date

21.8in

30-yr average

Typical Range

16.2–27.3in

10th–90th pct YTD

Departure

-9%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 3.25" · normal 3.42" (2.0–5.0)

Jan

Feb: 2.26" · normal 3.09" (1.7–4.4)

Feb

Mar: 4.17" · normal 4.32" (2.4–6.3)

Mar

Apr: 2.58" · normal 3.72" (2.0–6.0)

Apr

May: 2.83" · normal 3.02" (1.4–4.5)

May

Jun: 2.57" · normal 3.55" (1.4–6.5)

Jun

Jul: 2.22" (so far)· normal 3.06" (1.6–4.9)

Jul

Aug: normal 3.49" (1.6–5.7)

Aug

Sep: normal 3.50" (1.5–6.7)

Sep

Oct: normal 3.97" (1.3–6.4)

Oct

Nov: normal 3.44" (1.7–5.0)

Nov

Dec: normal 4.24" (2.4–6.6)

Dec

Baseline 1991–2020 · Source: Open-Meteo01:15 AM

Your History · STONY BROOK RESERVOIR AT DAM NEAR WALTHAM, MA

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Station Location

42.3557, -71.2651

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

Site #01104480·USGS

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