Naugatuck River River Levels

Last Updated: December 4, 2025

The Naugatuck River is a 40-mile-long river that flows through western Connecticut.


Summary

Total streamflow across the Naugatuck River was last observed at 446 cfs, and is expected to yield approximately 885 acre-ft of water today; about 62% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 723 cfs, with recent peaks last observed on 2021-09-02 when daily discharge volume was observed at 14,338 cfs.

Maximum discharge along the river is currently at the Naugatuck River At Beacon Falls reporting a streamflow rate of 330 cfs. However, the streamgauge with the highest stage along the river is the Naugatuck River At Thomaston with a gauge stage of 2.23 ft. This river is monitored from 2 different streamgauging stations along the Naugatuck River, the highest being situated at an altitude of 378 ft, the Naugatuck River At Thomaston.

River Details

Last Updated 2025-12-04
Discharge Volume 885 ACRE-FT
Streamflow 446.0 cfs
-201.0 cfs (-31.07%)
Percent of Normal 61.65%
Maximum 14,338.0 cfs
2021-09-02
Seasonal Avg 723 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Naugatuck River At Thomaston
USGS 01206900
116 cfs 2.23 ft -30.12
Naugatuck River At Beacon Falls
USGS 01208500
330 cfs 2.11 ft -31.39
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Naugatuck River is a 40.2-mile-long (64.7 km) river in the U.S. state of Connecticut. Its waters carve out the Naugatuck River Valley in the western reaches of the state, flowing generally due south and eventually emptying into the Housatonic River at Derby, Connecticut and thence 11 miles (18 km) to Long Island Sound. The Plume and Atwood Dam in Thomaston, completed in 1960 following the Great Flood of 1955, creates a reservoir on the river and is the last barrier to salmon and trout migrating up from the sea.