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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
01186500 STILL RIVER AT ROBERTSVILLE, CT
LOCATION - Lat 41°58'04.52", long 73°02'00.40" referenced to North American Datum of 1983, Litchfield County, CT, Hydrologic Unit 01080207, on left bank 1,500 ft downstream from Sandy Brook, 1 mi southeast of Robertsville, 1 mi northwest of Riverton, and 1 mi upstream from mouth.
DRAINAGE AREA - 85 mi².
REVISIONS HISTORY - WSP 1901: 1948-60. WDR-CT-83-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Oct 1948 to Sept. 1967, July 1969 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 510.24 ft above National Geodetic Vertical Datum of 1929. Satellite telemetry at station.
REMARKS - Water Year 2021 - 2023: Records good except for periods of estimated discharges, which are poor.
Water Year 2017 - 2020: Records good except for periods of estimated discharges, which are poor.
Water Year 2014 - 2016: Records good except for periods of estimated discharges, which are fair.
Peak flows are affected by flood-control regulation at Highland Lake Reservoir, Sucker Brook Dam, and Mad River Reservoir since 1962. The natural flow regime can by altered by regulation from Highland Lake Reservoir, Sucker Brook Dam, and Mad River Reservoir.
EXTREMES FOR PERIOD OF RECORD - The maximum peak flow of 44,000 ft³/s was obtained from rating curve extended above 5,600 ft³/s on basis of slope-area measurement of peak flow. The maximum peak stage of 16.48 ft. was from flood marks.
