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SUMMARY ARCHIVES

Summary of June 2014 Monthly Hydrologic Conditions

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

June 2014

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

Precipitation was above normal at the Newark index station, but below normal at the Atlantic City and Trenton index stations for the reference period 1981-2010. Newark reported 4.41 inches, which is 109.70 percent of normal.  Atlantic City reported 1.54 inches, which is 49.52 percent of normal.  Trenton reported 2.24 inches, which is 50.79 percent of normal. Total precipitation over the past 12 months was: 45.71 inches at Newark, which is 0.54 inches below normal; 42.75 inches at Atlantic City, which is 1.00 inches above normal; and 42.84 inches at Trenton, which is 3.60 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of June 30 was 74.496 billion gallons (92.1 percent of capacity), which is higher than the average June contents for the reference period 1961-1990.  The storage was 3.152 billion gallons less than one month ago and 4.304 billion gallons lower 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 above the long-term monthly-mean for the reference period 1981-2010 at the South Branch Raritan River near High Bridge and Great Egg Harbor River at Folsom index stations, but below the long-term monthly-mean at the Delaware River at Trenton index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 131 ft3/s, 117.0 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 84.7 ft3/s, 118.6 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 10,410 ft3/s, 94.9 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on June 30 was 9,310 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 19.6 to 24.8 degrees Celsius. Dissolved oxygen ranged from 8.0 to 9.8 milligrams per liter. Specific conductance ranged from 154 to 246 microsiemens per centimeter at 25°C.

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


All of the files listed below are in Portable Document Format (PDF) which can be viewed/printed with the Adobe Acrobat® Reader, freely available for most computer platforms.

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