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Summary of January 2008 Monthly Hydrologic Conditions

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

January 2008

Precipitation was below normal at all three index stations. Newark reported 2.30 inches, which is 57.8 percent of normal. Atlantic City reported 2.18 inches, which is 60.6 percent of normal. Trenton reported 1.65 inches, which is 51.4 percent of normal. Total precipitation over the past 12 months was: 53.29 inches at Newark, which is 7.04 inches above normal; 40.12 inches at Atlantic City, which is -0.47 inches below normal; and 41.12 inches at Trenton, which is -0.25 inches below normal.

Combined storage in the thirteen major water supply reservoirs as of January 31 was 64.41 billion gallons (80.1 percent of capacity), which is higher than the average January contents for the reference period 1961-1990. The storage was 1.99 billion gallons higher than one month ago and 14.0 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 below normal at South Branch Raritan River near High Bridge and Great Egg Harbor River at Folsom index stations and above normal at Delaware River at Trenton index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 158 ft³/s, 90.8 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 88.6 ft³/s, 82.0 percent of normal. The monthly mean discharge of the Delaware River at Trenton was 19,250 ft³/s, 141.5 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on January 31 was 11,000 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 decreased from last month, and were lower than one year ago at the Morrell 1 and Vocational School index wells, but higher than one year ago at the Readington School index station.

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 0.0 to 5.5 degrees Celsius. Dissolved oxygen ranged from 11.8 to 14.6 milligrams per liter. Specific conductance ranged from 107 to 199 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.

• 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