USGS Water-Year Summary for Site 01438500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Mean,Min.)
	00301 Diss oxygen,%saturtn(Min.,Max.,Mean)
	00400 pH(Min.,Max.,Med.)
	63680 Turbidity, Form Neph(Max.,Mean,Min.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01438500 DELAWARE RIVER AT MONTAGUE, NJ

LOCATION - Lat 41°18'33", long 74°47'43" referenced to North American Datum of 1983, Dingman Township, Pike County, PA, Hydrologic Unit 02040104, on right bank 1,500 ft upstream from toll bridge (on U.S. Route 206) between Montague, NJ and Milford, PA, 0.8 mi downstream from Sawkill Creek, and at river mile 246.3.

DRAINAGE AREA - 3,480 mi².

REVISIONS HISTORY - WDR NJ-81-2: 1980.

SURFACE-WATER RECORDS

PERIOD OF RECORD - March 1936 to September 1939 (gage heights only, published as "at Milford, PA"). Continuous-record discharge station, October 1939 to current year.

GAGE - Water-stage recorder with telemetry. Datum of gage is 369.20 ft above NAVD of 1988. Prior to Feb 9, 1940, non-recording gage on upstream side of left span of subsequently dismantled bridge at present site at datum 70 ft lower.

REMARKS - Records good, except for estimated discharges, which are fair. Diurnal fluctuation at medium and low flow caused by hydroelectric plants on tributary streams. Flow regulated by Lake Wallenpaupack, Cliff Lake, and by Pepacton, Cannonsville, Swinging Bridge, Toronto, and Neversink Reservoirs. Discharges above 105,000 ft³/s from rating curve extension on basis of flood-routing study.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct 10, 1903 reached a stage of 31.1 ft (from high-water mark), discharge, 217,000 ft³/s.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 250,000 ft³/s, from rating curve extended above 105,000 ft³/s on basis of flood-routing study, Aug 19, 1955, gage height, 35.15 ft; minimum discharge, 382 ft³/s, Aug 24, 1954.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

DISCRETE WATER QUALITY: Water years 1956-73, 1976-78, 1991 to August 2009.

CONTINUOUS WATER QUALITY:

Water temperature, specific conductance, pH, dissolved oxygen mg/L, dissolved oxygen percent saturation, and Turbidity Oct 2019 to current year.

INSTRUMENTATION - The continuous water quality monitor is deployed on the left edge of water, 1600 feet downstream from the established USGS stream gaging station. The YSI EXO3 multiparameter sonde is housed in a four-inch diameter stainless steel deployment pipe mounted to existing infrastructure with the deployment pipe’s perforated end staging the sensor in the stream roughly 15 feet from the bank.

REMARKS - The accuracy of continuous water-quality data can be found here.

EXTREMES FOR PERIOD OF RECORD -

Maximum water temperature, 29.1 deg C, many days; minimum water temperature, -0.1 deg C, many days.

Maximum specific conductance, 179 uS/cm, on Dec 23, 2022; minimum specific conductance, 32 uS/cm, many days.

Maximum pH, 9.5 std units, many days; minimum pH, 6.6 std units, on Aug 5, 2020.

Maximum dissolved oxygen, 15.4 mg/l, many days; minimum dissolved oxygen, 6.1 mg/l, many days.

Maximum dissolved oxygen, 141% saturation, on Sep 2, 2022; minimum dissolved oxygen, 75% saturation, many days.

Maximum turbidity, 1790 FNU, on Jan 13, 2024; minimum turbidity, < 0.5 FNU, many days.