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Summary of January 2004 Monthly Hydrologic Conditions

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

The following pages are adapted for online release from a summary of hydrologic condions for the previous month.

January 2004

Precipitation was below normal at all three index stations. Newark reported 1.83 inches, which is 46.0 percent of normal. Atlantic City reported 1.55 inches, which is 43.1 percent of normal. Trenton reported 1.98 inches, which is 61.7 percent of normal.

Combined storage in the thirteen major water supply reservoirs as of January 31 was 75.3 billion gallons, which is 93.7 percent of capacity. The storage was 3.54 billion gallons less than one month ago and 0.53 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 High Bridge and Folsom index stations, and above normal at the Trenton index station. The monthly-mean discharge at South Branch Raritan River near High Bridge was 146 ft³/s, 83.9 percent of normal. The monthly-mean discharge of the Great Egg Harbor River at Folsom was 94.6 ft³/s, 87.6 percent of normal. The observed monthly mean discharge of the Delaware River at Trenton was 15,700 ft³/s, 115 percent of normal*. The observed daily mean discharge of the Delaware River at Trenton on January 31 was estimated at 7500 ft³/s. All three index stations had varying degrees of ice effect during the month of January.

Groundwater levels, as measured in water-table observation wells, were above normal the Readington and Vocational School index wells, and slightly below normal at the Morrell index well.

* The January monthly-mean discharge at Delaware at Trenton was revised from 15,700 ft³/s, 115 percent of normal to 16,050 ft³/s, 118 percent of normal.

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