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Picture of a USGS scientist making a streamflow measurement


Summary of October 2017 Monthly Hydrologic Conditions

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

October 2017

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

Precipitation was above normal at all three index stations for the reference period 1981-2010. Newark reported 4.94 inches, which is 137.22 percent of normal.  Atlantic City reported 3.89 inches, which is 113.74 percent of normal.  Trenton reported 5.22 inches, which is 124.88 percent of normal. Total precipitation over the past 12 months was: 53.77 inches at Newark, which is 7.52 inches above normal; 50.88 inches at Atlantic City, which is 9.13 inches above normal; and 43.80 inches at Trenton, which is 2.64 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of October 31 was 50.993 billion gallons (63.0 percent of capacity), which is less than the average October contents for the reference period 1961-1990.  The storage was 5.499 billion gallons less than one month ago and 12.113 billion gallons greater 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 67.5 ft3/s, 77.0 percent of the long-term mean.  The monthly-mean discharge of the Great Egg Harbor River at Folsom was 37.6 ft3/s, 63.0 percent of the long-term mean.  The monthly mean discharge of the Delaware River at Trenton was 4,580 ft3/s, 54.0 percent of the long-term mean. The observed daily mean discharge of the Delaware River at Trenton on October 31 was 19,290 ft3/s.

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

Water-quality parameters collected from the Delaware River at Trenton were within the range of historical monthly values. Water temperature ranged from 12.5 to 22.6 degrees Celsius. Dissolved oxygen ranged from 8.2 to 10.7 milligrams per liter. Specific conductance ranged from 194 to 305 microsiemens per centimeter at 25°C.

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

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