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Summary of January 2007 Monthly Hydrologic Conditions

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

January 2007

Precipitation was below normal at the Newark and Atlantic City index stations, and just above normal at the Trenton index station. Newark reported 3.50 inches, which is 87.9 percent of normal. Atlantic City reported 3.41 inches, which is 94.7 percent of normal. Trenton reported 3.29 inches, which is 102 percent of normal. Total precipitation over the past 12 months was: 48.84 inches at Newark, which is 2.59 inches above normal; 48.25 inches at Atlantic City, which is 7.66 inches above normal; and 47.11 inches at Trenton, which is 5.72 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of January 31 was 78.4 billion gallons (97.5 percent of capacity), which is greater than the average January contents for the reference period 1961-1990. The storage was 0.07 billion gallons less than one month ago and 0.90 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, Charlottesburg Reservoir, Echo Lake, Wanaque Reservoir and Spruce Run Reservoir.

Streamflow was just below normal at the High Bridge index station, and above normal at the Folsom and Trenton index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 163 ft³/s, 93.7 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 132 ft³/s, 122 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 19,110 ft³/s, 140 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on January 31 was 9,660 ft³/s.

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

A maximum water temperature of 8.1 degrees Celsius for the Delaware River at Trenton was just above the highest recorded January temperature for the period of record. The previous record of 8.0 degrees Celsius was recorded in January 1995. The minimum water temperature and other water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 0.4 to 8.1 degrees Celsius. Dissolved oxygen ranged from 11.4 to 15.3 milligrams per liter. Specific conductance ranged from 105 to 180 microsiemens per centimeter at 25°C.

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.

• Combined Storage in the 13 Major Water Supply Reservoirs
• Monthly precipitation at three selected sites
• Groundwater levels in selected Water-table observation wells
• Streamflow at selected sites
• Water quality for the Delaware River at Trenton