LOCATION--Lat 42° 38’03", long 71°
39’30", Middlesex County, Hydrologic Unit 01070004, on left
bank 0.7 mi downstream from Trout Brook and 2.7 mi northwest of West
Groton.
DRAINAGE AREA--63.7 mi2, excludes 2.16
mi2, above outlet of Ashby Reservoir.
PERIOD OF RECORD--Discharge: October 1949 to current year.
Water-quality records: Water year 1957.
REVISED RECORDS--WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum
of gage is 243.50 ft above NAVD 1988. Prior to May 13, 2020, datum of
gage reported as 244.27 ft above NGVD 1929.
REMARKS--Occasional regulation at low flow by mill upstream;
regulation greater prior to 1961. Entire flow from 2.16 mi2
upstream from outlet of Ashby Reservoir diverted for municipal supply
of Fitchburg except for occasional periods of spill.
COOPERATION BY-- Massachusetts Department Of
Conservation and Recreation, Office of Water
Resources.
| Boating safety tips |
| Min (1964) | 25th percen- tile | Most Recent Instantaneous Value May 28 | Median | Mean | 75th percen- tile | Max (2005) |
|---|---|---|---|---|---|---|
| 30.0 | 54 | 65.9 | 78 | 111 | 139 | 423 |
U.S. Department of the Interior |
U.S. Geological Survey
Title: USGS Current Conditions for Massachusetts
URL:
Page Contact Information: Massachusetts Water Data Support Team
Page Last Modified: 2023-05-28 23:35:49 EDT
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