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Summary of January 2005 Monthly Hydrologic Conditions

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

January 2005

Precipitation was essentially normal at the Newark index station, and above normal at the Atlantic City and Trenton index stations. Newark reported 3.97 inches, which is 99.7 percent of normal. Atlantic City reported 4.02 inches, which is 112 percent of normal. Trenton reported 4.03 inches, which is 126 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of January 31 was 78.5 billion gallons, which is 97.7 percent of capacity. The storage was 0.16 billion gallons less than one month ago and 3.20 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 below normal at the Great Egg Harbor River at Folsom index station, and above normal at South Branch Raritan River at High Bridge and Delaware River at Trenton index stations. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 100 ft³/s, 92.6 percent of normal. The monthly-mean discharge at South Branch Raritan River near High Bridge was 202 ft³/s, 116 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 27,400 ft³/s, 201 percent of normal. The observed daily mean discharge of the Delaware River at Trenton on January 31 was 14,300 ft³/s.

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

Water quality parameters collected from the Delaware River at Trenton were within recorded historical monthly extremes. Water temperature ranged from 0.0 to 5.9 degrees celsius. Dissolved oxygen ranged from 12.2 to 15.9 milligrams per liter. Specific conductance ranged from 100 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