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Most Recent Hydrologic Conditions Report
June 11, 2018
Precipitation

The average observed precipitation for the Delaware River Basin above Montague, New Jersey for the period January 1-June 10, 2018 was 19.62 inches, or 0.93 inches above normal. Similarly, the average observed precipitation for the Delaware River Basin above Trenton, New Jersey was 23.10 inches, or 3.49 inches above normal for this period. Also through June 10, the observed precipitation for Wilmington, Delaware was 22.38, or 4.03 inches above normal.

The attached table (pdf 488 KB) summarizes precipitation for 2017 and 2018 for select stations in the Delaware River Basin.

Precipitation Departure Maps (National Weather Service Middle Atlantic River Forecast Center's Web Site)

Streamflow

The average observed streamflow of the Delaware River at Montague, New Jersey during May 2018 was 9,137 cubic feet per second (cfs), or 158-percent of the long-term average for the month. The average observed streamflow of the Delaware River at Trenton, New Jersey in May was 20,587 cfs, or 176-percent of the long-term average for the month.

During June 1-10, the average observed streamflow of the Delaware River at Montague was 4,195 cfs, or 133-percent of the long-term average for the month. Similarly, the average streamflow at Trenton was 10,233 cfs, or 143-percent of the long-term average for the month.

Attached are graphical presentations of daily mean streamflows at Montague and Trenton for the 365-day period ending June 10, 2018 (pdf 352 KB).

Reservoirs

Lower Basin

Lower Basin Reservoir Storage as of June 11, 2018:
Beltzville

13.55 bg usable, or 100.4% of usable storage

Blue Marsh

6.69 bg usable, or 116.0% of winter pool usable storage

Merrill Creek

15.08 bg usable, 96.1% of usable storage

Upper Basin

New York City (NYC) Delaware Basin Reservoir Storage as of June 11, 2018:
Pepacton

137.3 bg usable, or 98.5% of usable storage

Cannonsville

90.9 bg usable, or 97.2% of usable storage

Neversink

34.0 bg usable, or 97.9% of usable storage

Total

262.1 bg usable, or 98% of usable storage

The long-term median storage for the NYC Delaware Basin Reservoirs for June 11 is 261.9 bg, or 97.9% percent of usable storage.

Click here for information on the NYC Delaware Basin reservoir storage levels from January 2017 to the present.

Groundwater

The table below displays the current status (as of June 11, 2018) of groundwater levels for 13 monitoring wells in the Delaware River Basin and compares them to levels reported at the last DRBC commission meeting. Refer to Groundwater Notes at the end of this report for more details about the wells. Water levels within the 25- to 75- percentile range are defined as “normal.”

COUNTY

STATE

AGENCY
DATA

WELL ID

YEAR RECORD BEGINS

INDICATOR STATUS AS OF MARCH 13, 2018

CURRENT INDICATOR STATUS AS OF JUNE 11, 2018

Sullivan

NY

USGS

Sv 535

2001

Above Normal

Normal

Wayne

PA

USGS

WN 64

1967

Above Normal

Above Normal

Monroe

PA

USGS

MO 190

1967

Above Normal

Normal

Carbon

PA

USGS

CB 104

1969

Above Normal

Above Normal

Schuylkill

PA

USGS

SC 296

1975

Above Normal

Normal

Lehigh

PA

USGS

LE 644

1971

Normal

Normal

Lebanon

PA

USGS

LB 372

1973

Above Normal

Above Normal

Bucks

PA

USGS

BK 1020

1975

Above Normal

Above Normal

Chester

PA

USGS

CH 10

1966

Normal

Normal

Delaware

PA

USGS

DE 723

1983

Normal

Normal

Burlington

NJ

USGS

050689

1955

Below Normal

Normal

Cumberland

NJ

USGS

110042

1972

Normal

Normal

New Castle

DE

Delaware GS

Db24-18

1993

Below Normal

Below Normal (through April 2018; more recent data is currently unavailable)

Chlorides (Salt Front)

The salt front is defined as the 250 parts-per-million isochlor. The seven-day average location of the salt front is used by DRBC as an indicator of salinity intrusion in the Delaware Estuary. The salt front’s location fluctuates along the main stem Delaware River as streamflow increases or decreases in response to changing inflows, diluting or concentrating chlorides in the river.

During May, the seven-day average location of the salt front varied from river mile 67 mid-month to downstream of river mile 54 on May 31. The normal location of the salt front during May is river mile 68, a location that is 10 miles downstream of the Delaware-Pennsylvania state line.

As of June 10, the salt front is estimated to be at river mile 69, which is the normal location of the salt front during June.


 NOTES:

  • Report prepared by DRBC Staff.
  • Acknowledgments--Kimberly-Clark Corp.; NWS; NYC DEP; USACOE; USGS; Delaware Geological Survey (DGS).

  • Groundwater:
    • The groundwater categories labeled Drought Watch, Drought Warning, and Drought Emergency reflect only the relative range of the indicator values and are used for hydrological assessment purposes. Drought Watch represents values in the 10-25 percentile depth, Drought Warning represents values in the 5-10 percentile depth, and Drought Emergency represents values in the 0-5 percentile depth. Such category labels are independent of official drought status which is declared only by the Governor of the respective state. Official declarations of drought stage are based upon a review of multiple ground and surface water conditions, soil moisture, precipitation, weather forecasts, purveyor reports, and other considerations.
    • In this report, we follow the customary practice of referring to the range of values defined by the 25- and 75-percentile as the “normal” range.