Stony Brook Reservoir at Dam near Waltham water level

Name: Stony Brook Reservoir at Dam near Waltham water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Reservoir, Stony Brook Reservoir, Massachusetts, United States

Directions

Normal for mid-October

Surface elevation

78.27ft Down 0.09 ft over the last 24 hours

Measured Oct 20, 2026, 06:40 AM EDT (1 hour ago)

Water level: 0.86 ft
Flow: 2.0 cfs
Water temperature: 58 °F

History

7 days

Surface elevation

What this means

The lake level at Stony Brook Reservoir at Dam near Waltham reads 78.27 ft, about where it usually sits at this time of year.

It is still going down, by 0.09 ft over the past 24 hours. The 30-day range is 78.27 ft – 78.47 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt. The sensor also reports a water temperature of 58 °F.

Compared with 5 years of daily readings for this time of year. How to read levels

Boating and fishing at Stony Brook Reservoir at Dam near Waltham

A lake in its usual range is what most ramps, docks and swimming areas are built for.

With water at 58 °F, a fall from a boat or paddleboard is dangerous. A life jacket and a wetsuit make a big difference.

Weather at the gauge

No rain in the last 3 days.

20 Tue 62° 36° – Wind 14 mph

21 Wed 50° 42° – Wind 12 mph

22 Thu 62° 43° – Wind 10 mph

23 Fri 56° 42° – Wind 10 mph

24 Sat 62° 39° – Wind 7 mph

25 Sun 65° 44° – Wind 5 mph

26 Mon 70° 48° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:04 AM Sunset 05:57 PM Daylight 10 hr, 53 min First quarter 68%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Stony Brook Reservoir, Unnamed Tributary 1, near WestonRiver gauge, Stony Brook Reservoir, Unnamed Tributary 1	0.4 cfs	Normal	±0	0.2 mi
Stony Brook at RT 20 at WalthamRiver gauge, Stony Brook	8.1 cfs	Very low	−0.4 cfs	1.0 mi
Stony Brook, Unnamed Tributary 1, near WalthamRiver gauge, Stony Brook, Unnamed Tributary 1	0.4 cfs	Normal	±0	1.2 mi
Charles River at WalthamRiver gauge, Charles River	1.49 ft	Below flood stage	−0.04 ft	2.0 mi
Stony Brook at Viles Street, near WestonRiver gauge, Stony Brook	2.0 cfs	Low	±0	2.4 mi
Hobbs Brook below Cambridge Reservoir near Kendall GreenReservoir, Hobbs Brook	5.2 cfs	Normal	±0	3.0 mi
Charles River at WellesleyRiver gauge, Charles River	160 cfs	Normal	−23.0 cfs	3.3 mi
Cambridge Reservoir, Unnamed Tributary 3, near LexingtonRiver gauge, Cambridge Reservoir, Unnamed Tributary 3	0.3 cfs	Normal	±0	4.4 mi

Questions and answers

Is Stony Brook Reservoir at Dam near Waltham really 78.27 ft deep?

No. 78.27 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Stony Brook Reservoir at Dam near Waltham today?

On Oct 20, 2026, 06:40 AM EDT, the surface elevation was 78.27 ft. Down 0.09 ft over the last 24 hours.

Is Stony Brook Reservoir at Dam near Waltham rising or falling?

Down 0.09 ft over the last 24 hours.

Is the level of Stony Brook Reservoir at Dam near Waltham normal?

Normal for mid-October. Compared with 5 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01104480 (Agency page)
Coordinates: 42.35565, -71.26506 (WGS84)
Vertical datum: local
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	78.27 ft	2026-10-20 10:40	Provisional
Water level	0.86 ft	2026-10-20 11:10	Provisional
Flow	2.0 cfs	2026-10-20 11:10	Provisional
Water temperature	58 °F	2026-10-20 10:40	Provisional

Download

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How to cite

U.S. Geological Survey: Stony Brook Reservoir at Dam near Waltham (usgs:01104480). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/massachusetts/stony-brook-reservoir-at-dam-near-waltham

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer