Stony Brook at RT 20 at Waltham water level

Name: Stony Brook at RT 20 at Waltham water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Stony Brook, Massachusetts, United States

Directions

Low for mid-October

Water level

4.88ft Down 0.13 ft over the last 24 hours

Measured Oct 18, 2026, 04:10 PM EDT (21 min ago)

Flow: 9.2 cfs
Water temperature: 53 °F

History

7 days

Water level

What this means

At 4.88 ft, Stony Brook at RT 20 at Waltham is below normal for mid-October.

The level is falling, down 0.13 ft over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. Over the past 30 days it has moved between 4.88 ft and 5.14 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that. The sensor also reports a water temperature of 53 °F.

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

What the stage means on the water

Low water means more dragging on shallow riffles and slower floats. Fish crowd into the deeper runs, and warm, low water stresses them, so play and release them quickly.

Weather at the gauge

Rain in the last 3 days: 0.09 in. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 53° 32° – Wind 8 mph

19 Mon 57° 37° – Wind 7 mph

20 Tue 60° 47° – Wind 13 mph

21 Wed 52° 45° – Wind 13 mph

22 Thu 63° 41° – Wind 8 mph

23 Fri 58° 43° – Wind 8 mph

24 Sat 56° 38° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:02 AM Sunset 06:00 PM Daylight 10 hr, 58 min First quarter 52%

Map

Other gauges on Stony Brook

Gauge	Level	Compared with normal	24 hours	Distance
Stony Brook at East Sebago, MaineRiver gauge, Stony Brook	3.66 ft	No reference yet	−0.03 ft	108 mi
Stony Brook at Viles Street, near WestonRiver gauge, Stony Brook	2.3 cfs	Low	−0.7 cfs	1.5 mi
Stony Brook near West SuffieldRiver gauge, Stony Brook	6.9 cfs	Normal	−4.5 cfs	79 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Stony Brook, Unnamed Tributary 1, near WalthamRiver gauge, Stony Brook, Unnamed Tributary 1,	0.4 cfs	Normal	±0	0.2 mi
Stony Brook Reservoir at Dam near WalthamReservoir, Stony Brook Reservoir	1.9 cfs	Normal	+0.1 cfs	1.0 mi
Stony Brook Reservoir, Unnamed Tributary 1, near WestonRiver gauge, Stony Brook Reservoir, Unnamed Tributary 1,	0.5 cfs	Normal	−0.1 cfs	1.0 mi
Charles River at WalthamRiver gauge, Charles River	1.56 ft	Below flood stage	−0.03 ft	1.9 mi
Hobbs Brook below Cambridge Reservoir near Kendall GreenReservoir, Hobbs Brook	5.4 cfs	Normal	+0.1 cfs	2.0 mi
Cambridge Reservoir, Unnamed Tributary 3, near LexingtonRiver gauge, Cambridge Reservoir, Unnamed Tributary 3,	0.2 cfs	Low	−0.5 cfs	3.6 mi
Charles River at WellesleyRiver gauge, Charles River	195 cfs	Normal	−8.0 cfs	4.2 mi
Cambridge Reservoir, Unnamed Tributary 2, near LexingtonRiver gauge, Cambridge Reservoir, Unnamed Tributary 2,	0.1 cfs	Low	±0	4.7 mi

Questions and answers

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Stony Brook at RT 20 at Waltham today?

On Oct 18, 2026, 04:10 PM EDT, the water level was 4.88 ft. Down 0.13 ft over the last 24 hours.

Is Stony Brook at RT 20 at Waltham rising or falling?

Down 0.13 ft over the last 24 hours.

Is the level of Stony Brook at RT 20 at Waltham normal?

Low 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:01104460 (Agency page)
Coordinates: 42.36899, -71.27061 (WGS84)
Vertical datum: NAVD88
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
Water level	4.88 ft	2026-10-18 20:10	Provisional
Flow	9.2 cfs	2026-10-18 20:10	Provisional
Water temperature	53 °F	2026-10-18 20:10	Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

<iframe src="https://nivelmap.com/embed/10678?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="Stony Brook at RT 20 at Waltham water level"></iframe>

How to cite

U.S. Geological Survey: Stony Brook at RT 20 at Waltham (usgs:01104460). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/massachusetts/stony-brook-at-rt-20-at-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