USGS Water-Year Summary for Site 01636846

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Mean,Min.)
	72254 Sensor velocity(Max.,Min.,Mean)

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

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USGS Water-Year Summary 2024

01636846 LITTLE CATOCTIN CREEK AT ROSEMONT, MD

LOCATION - Lat 39°20'15.4", long 77°37'35.3" referenced to North American Datum of 1983, Frederick County, MD, Hydrologic Unit 02070008, on right bank 0.85 mi upstream of MD Highway 79 and 0.6 mi northwest of Rosemont.

DRAINAGE AREA - 4.55 mi². from automated delineation using 30-meter National Elevation Dataset, digital elevation model data, dated December 2011.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2016 to July 2020 (discontinued).

GAGE - Water-stage recorder, crest-stage gage, and velocity meter. Datum of gage is 395.79 ft above North American Vertical Datum of 1988.

REMARKS -

Water Years 2019-2020: Records fair, except those above 50 ft³/s and those for estimated discharges, which are poor.

Water Year 2018: Records fair, except those for estimated discharges, which are poor.

Water Year 2017: For the period Oct 1, 2016 to Sept 13, 2017: Records were estimated using a drainage area correction from site 01636845. For the period Sept 14, 2017 to Sept 30, 2017: Records fair, no estimated discharges.

U.S. Geological Survey water-data telemeter at station.

WATER-QUALITY RECORDS

PERIOD OF RECORD - WATER TEMPERATURE: December 2016 to current year. SPECIFIC CONDUCTANCE: December 2016 to current year. pH: December 2016 to current year. TURBIDITY: December 2016 to current year. ADVM December 2016 to current year.

INSTRUMENTATION -

YSI EXO2 multi-parameter monitor equipped with the following:

YSI-EXO Conductivity & Temperature Smart Sensor
YSI-EXO pH Smart Sensor
YSI-EXO Turbidity Smart Sensor, optical

ADVM SL1500 from December 2016 to September 2017; SL3000 from September 2017 to present

EXTREMES FOR PERIOD OF DAILY RECORD -

EXTREMES FOR PERIOD OF DAILY RECORD (WQ).--

SPECIFIC CONDUCTANCE: Maximum, 2070 microsiemens per centimeter, on many days, first occurrence on February 02, 2018; minimum, 47 microsiemens per centimeter, on May 15, 2018.

WATER TEMPERATURE: Maximum, 34.8 °C, on many days, first occurrence on July 21, 2019; minimum, -0.2°C, on many days, first occurrence on January 04, 2018.

pH: Maximum, 9.8 standard units, May 01, 2018; minimum, 6.8 standard units, many days, first occurrence was on August 08, 2018.

TURBIDITY: Maximum, 2170 formazin nephelometric units (FNU), on May 16, 2018; minimum, 1.1 formazin nephelometric units (FNU), on many days, first occurrence was on October 21, 2019.

MEAN VELOCITY FROM 3000kHz ACOUSTIC UNIT(Inactive 8/01/2017): Maximum, 3.63 feet per second, July 6, 2017; minimum, -0.21 feet per second, on July 2, 2017.

MEAN VELOCITY FROM 1500kHz ACOUSTIC UNIT(Active 8/01/2017): Maximum, 1.06 feet per second, August 18, 2017; minimum, -0.21 feet per second, on August 27, 2017.

* Multiple occurrences of the same extreme in selected dataset. First occurrence listed.
ICE Flow at station affected by ice