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Picture of a USGS scientist making a streamflow measurement


Summary of November 2016 Monthly Hydrologic Conditions

Compiled in cooperation with the New Jersey Department of Environmental Protection
Provisional assessment of hydrologic conditions in New Jersey

November 2016

Map of New Jersey showing sites where hydrologic conditions are reported.

Precipitation was above normal at the Newark index station and below normal at the Trenton and Atlantic City index stations, for the reference period 1981-2010. Newark reported 6.52 inches, which is 178.63 percent of normal.  Atlantic City reported 1.08 inches, which is 33.03 percent of normal.  Trenton reported 2.90 inches, which is 87.61 percent of normal. Total precipitation over the past 12 months was: 39.90 inches at Newark, which is 6.35 inches below normal; 47.17 inches at Atlantic City, which is 5.42 inches above normal; and 36.58 inches at Trenton, which is 9.86 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of November 30 was 39.867 billion gallons (49.3 percent of capacity), which is less than the average November contents for the reference period 1961-1990.  The storage was 0.987 billion gallons greater than one month ago and 8.003 billion gallons less than one year ago.  The thirteen major water supply reservoirs are as follows: Lake Tappan, Woodcliff Lake, Oradell Reservoir, DeForest Lake, Splitrock Reservoir, Boonton Reservoir, Canistear Reservoir, Oak Ridge Reservoir, Clinton Reservoir, Charlotteburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.    

Streamflow was below the long-term monthly-mean for the reference period 1981-2010 at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 24.7 ft3/s, 22.5 percent of the long-term mean. This set new monthly and daily minimums for the station, surpassing the previous minimums set in 2002 and 1966, respectively. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 36.9 ft3/s, 51.5 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 3,127 ft3/s, 28.0 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on November 30 was 5,080 ft3/s.

Groundwater levels, as measured in water-table observation wells for the month of November, were below normal at all three index wells. Levels decreased from last month at the Readington School 11 and Vocational School 2 index wells, and increased from last month at the Morrell 1 index well. Levels were lower than one year ago at all three index wells.

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 5.1 to 13.0 degrees Celsius. Dissolved oxygen ranged from 10.4 to 15.4 milligrams per liter. Specific conductance ranged from 222 to 269 microsiemens per centimeter at 25°C.

Note: The preceding data is preliminary and subject to revision.

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