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Summary of January 2006 Monthly Hydrologic Conditions

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

January 2006

Precipitation was above normal at all three index stations. Newark reported 4.82 inches, which is 121 percent of normal. Atlantic City reported 5.83 inches, which is 162 percent of normal. Trenton reported 4.86 inches, which is 151 percent of normal. Total precipitation over the past 12 months was: 45.04 inches at Newark, which is 1.21 inches below normal; 45.78 inches at Atlantic City, which is 5.19 inches above normal; and 49.45 inches at Trenton, which is 8.06 inches above normal.

Combined storage in the thirteen major water supply reservoirs as of January 31 was 79.3 billion gallons, (98.6 percent of capacity), which is greater than the average January contents for the reference period 1961-1990. The storage was 1.81 billion gallons more than one month ago and 0.77 billion gallons more 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 above normal at all three index stations. The monthly-mean discharge at South Branch Raritan River near High Bridge was 295 ft³/s, 170 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 144 ft³/s, 133 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 31,770 ft³/s, 236 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on January 31 was 21,200 ft³/s.

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

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 1.3 to 5.6 degrees Celsius. Dissolved oxygen ranged from 10.2 to 14.8 milligrams per liter. Specific conductance ranged from 95 to 184 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