CURRENT WATER RESOURCES CONDITIONS IN CONNECTICUT

U.S. Department of the Interior Seal

May 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 MapMonthly 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, CT4.02626.94 - 13.67.632.19 Normal
01121000 Mount Hope River near Warrenville, CT28.68036.5 - 76.877.33.12 Above normal
01123000 Little River near Hanover, CT306948.4 - 80.562.62.41 Normal
01184100 Stony Brook near West Suffield, CT10.44012.9 - 23.721.42.37 Normal
01188000 Bunnell Brook near Burlington, CT4.1896.38 - 12.48.172.30 Normal
01193500 Salmon River near East Hampton, CT10092158 - 2731902.19 Normal
01194500 East Branch Eightmile River near North Lyme, CT22.38337.2 - 64.341.52.15 Normal
01195100 Indian River near Clinton, CT5.68397.58 - 15.39.741.98 Normal
01196620 Mill River near Hamden, CT24.55238.7 - 7037.61.77 Below normal
01204000 Pomperaug River at Southbury, CT75.18893.6 - 1841071.64 Normal
01208990 Saugatuck River near Redding, CT215628.7 - 60.135.91.97 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)191 25.90 - 21.3024.420.22 Normal
412429073165101 NT 15 (Newtown, CT)541 4.64 - 3.215.111.31 Below normal
412825072410501 D 117 (Durham, CT)351 10.80 - 9.8210.670.47 Normal
412916073121701 SB 42 (Southbury, CT)271 13.80 - 12.4012.42-0.68 Normal
413535072253701 MB 32 (Marlborough, CT)341 4.22 - 3.033.45-0.14 Normal
414240072033201 SC 22 (Scotland, CT)351 11.10 - 10.5010.80-0.30 Normal
414741072134501 MS 44 (Mansfield, CT)361 3.74 - 2.402.42-0.57 Normal
414831072173002 MS 80 (Mansfield, CT)191 13.60 - 12.4013.160.16 Normal
1 Daily Value Records and Field Readings
2 Daily Value Records Only

 

Flow or Water LevelPercentile RangeExplanation
Low0thThe 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 normal0th to 10thThe monthly mean streamflow or median water level during this month is less than the 10th percentile when compared to all of the months during the period of record for this site.
Below normal10th to 25thThe monthly mean streamflow or median water level during this month is between the 10th and 25th percentiles when compared to all of the months during the period of record for this site.
Normal25th to 75thThe monthly mean streamflow or median water level during this month is between the 25th and 75th percentiles when compared to all of the months during the period of record for this site.
Above normal75th to 90thThe monthly mean streamflow or median water level during this month is between the 75th and 90th percentiles when compared to all of the months during the period of record for this site.
Much above normal90th to 100thThe monthly mean streamflow or median water level during this month is greater than the 90th percentile when compared to all of the months during the period of record for this site.
High100thThe monthly mean streamflow or median water level during this month is the highest ever recorded during the period of record for this site.
410628073413301 GW 21 (Greenwich, CT), May 2021 mean water level 24.42 feet 412429073165101 NT 15 (Newtown, CT), May 2021 mean water level 5.11 feet 412825072410501 D 117 (Durham, CT), May 2021 mean water level 10.67 feet 412916073121701 SB 42 (Southbury, CT), May 2021 mean water level 12.42 feet 413535072253701 MB 32 (Marlborough, CT), May 2021 mean water level 3.45 feet 414240072033201 SC 22 (Scotland, CT), May 2021 mean water level 10.8 feet 414741072134501 MS 44 (Mansfield, CT), May 2021 mean water level 2.42 feet 414831072173002 MS 80 (Mansfield, CT), May 2021 mean water level 13.16 feet 01118300 Pendleton Hill Brook near Clarks Falls, CT, May 2021 mean streamflow 7.63 cfs 01121000 Mount Hope River near Warrenville, CT, May 2021 mean streamflow 77.3 cfs 01123000 Little River near Hanover, CT, May 2021 mean streamflow 62.6 cfs 01184100 Stony Brook near West Suffield, CT, May 2021 mean streamflow 21.4 cfs 01188000 Bunnell Brook near Burlington, CT, May 2021 mean streamflow 8.17 cfs 01193500 Salmon River near East Hampton, CT, May 2021 mean streamflow 190 cfs 01194500 East Branch Eightmile River near North Lyme, CT, May 2021 mean streamflow 41.5 cfs 01195100 Indian River near Clinton, CT, May 2021 mean streamflow 9.74 cfs 01196620 Mill River near Hamden, CT, May 2021 mean streamflow 37.6 cfs 01204000 Pomperaug River at Southbury, CT, May 2021 mean streamflow 107 cfs 01208990 Saugatuck River near Redding, CT, May 2021 mean streamflow 35.9 cfs