October 2021 CURRENT WATER RESOURCES CONDITIONS IN CONNECTICUT

CURRENT WATER RESOURCES CONDITIONS IN CONNECTICUT

U.S. Department of the Interior Seal

October 2021

USGS New England Water Science Center, Connecticut Office

PROVISIONAL DATA: All data presented in this report are provisional and subject to revision.

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Monthly Surface Water Conditions Map

Monthly Groundwater Conditions Map

SURFACE WATER
Station Number	Station Name	Drainage Area (mi²)	Years Of Record	Normal Range (cfs)	Monthly Mean (cfs)	Monthly Mean (in)	Percentile Class
01118300	Pendleton Hill Brook near Clarks Falls, CT	4.02	63	1.75 - 5.19	3.55	1.02	Normal
01121000	Mount Hope River near Warrenville, CT	28.6	81	10.3 - 35.4	67.2	2.71	Above normal
01123000	Little River near Hanover, CT	30	70	13.4 - 34.8	50	1.92	Above normal
01184100	Stony Brook near West Suffield, CT	10.4	40	4.92 - 17.5	15.9	1.76	Normal
01188000	Bunnell Brook near Burlington, CT	4.1	90	2.09 - 6.93	13.4	3.77	Much above normal
01193500	Salmon River near East Hampton, CT	100	93	30.8 - 118	166	1.91	Above normal
01194500	East Branch Eightmile River near North Lyme, CT	22.3	84	7.07 - 28.5	31.2	1.61	Above normal
01195100	Indian River near Clinton, CT	5.68	39	1.18 - 5.75	9.18	1.86	Above normal
01196620	Mill River near Hamden, CT	24.5	53	9.88 - 35.3	47.9	2.25	Above normal
01204000	Pomperaug River at Southbury, CT	75.1	89	22.4 - 102	144	2.21	Above normal
01208990	Saugatuck River near Redding, CT	21	57	5.28 - 31.6	62.7	3.44	Much above normal

GROUNDWATER
Station Number	Station Name	Years Of Record	Normal Range (ft)	Monthly Median (ft)	Departure From Monthly Median (ft)	Percentile Class
410628073413301	GW 21 (Greenwich, CT)	20¹	42.30 - 22.70	27.92	-8.38	Normal
412429073165101	NT 15 (Newtown, CT)	54¹	9.20 - 5.52	5.09	-2.76	Above normal
412825072410501	D 117 (Durham, CT)	35¹	12.30 - 9.84	10.57	-0.63	Normal
412916073121701	SB 42 (Southbury, CT)	28¹	22.20 - 15.80	13.24	-5.17	Much above normal
413535072253701	MB 32 (Marlborough, CT)	35¹	9.76 - 7.15	4.84	-3.58	Much above normal
414240072033201	SC 22 (Scotland, CT)	36¹	13.70 - 13.30	12.18	-1.22	Above normal
414741072134501	MS 44 (Mansfield, CT)	38¹	6.06 - 2.51	2.30	-1.21	Above normal
414831072173002	MS 80 (Mansfield, CT)	19¹	21.70 - 16.80	14.78	-4.92	Above normal
¹ Daily Value Records and Field Readings ² Daily Value Records Only

Flow or Water Level	Percentile Range	Explanation
Low	0^th	The monthly mean streamflow or median water level during this month is the lowest ever recorded during the period of record for this site.
Much below normal	0^th to 10^th	The monthly mean streamflow or median water level during this month is less than the 10^th percentile when compared to all of the months during the period of record for this site.
Below normal	10^th to 25^th	The monthly mean streamflow or median water level during this month is between the 10^th and 25^th percentiles when compared to all of the months during the period of record for this site.
Normal	25^th to 75^th	The monthly mean streamflow or median water level during this month is between the 25^th and 75^th percentiles when compared to all of the months during the period of record for this site.
Above normal	75^th to 90^th	The monthly mean streamflow or median water level during this month is between the 75^th and 90^th percentiles when compared to all of the months during the period of record for this site.
Much above normal	90^th to 100^th	The monthly mean streamflow or median water level during this month is greater than the 90^th percentile when compared to all of the months during the period of record for this site.
High	100^th	The monthly mean streamflow or median water level during this month is the highest ever recorded during the period of record for this site.