USGS Water-Year Summary for Site 01636845

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Min.,Mean,Max.)
	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

01636845 LITTLE CATOCTIN CREEK AT ROSEMONT, MD

LOCATION - Lat 39°20'28.5", long 77°38'02.7" referenced to North American Datum of 1983, Frederick County, MD, Hydrologic Unit 02070008, on left bank, at downstream side of highway bridge on Jefferson Pike and 0.9 mi northwest of Rosemont.

DRAINAGE AREA - 4.16 mi². from automated delineation using 30-meter National Elevation Dataset, digital elevation model data, dated December 2011.

REVISIONS HISTORY - https://waterdata.usgs.gov/nwis/uv/?site_no=01636845: 2020.

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 413.26 ft above North American Vertical Datum of 1988. October 1, 2016 to January 18, 2019, at site 80 ft downstream on right bank at gage datum 2.0 ft higher. May 23, 2019 to July 6, 2020, at current location and gage datum.

REMARKS -

Water Year 2020: Records poor, including those for estimated discharges.

Water Year 2019: 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: Records good, except those for estimated discharges, which are poor.

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

CLIMATOLOGICAL RECORDS

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

INSTRUMENTATION - Weighing cell precipitation gage.

EXTREMES FOR PERIOD OF RECORD - Maximum daily precipitation, 4.46 in., July 21, 2018.

REMARKS - Gaps in record indicate missing or erroneous data. Records estimated as zero are based on confirmation with nearby U.S. Geological Survey and National Weather Service sites that zero precipitation occurred on those days. U.S. Geological Survey water-data telemeter at station.

WATER-QUALITY RECORDS

INSTRUMENTATION - Water-quality monitor and automatic sampler, November 2016 to current year.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 2470 microsiemens per centimeter, February 07, 2018; minimum, 54 microsiemens per centimeter, May 15, 2018.

WATER TEMPERATURE: Maximum, 31.2°C, on many days, first occurrence on July 03, 2018; minimum, -0.1°C, on many days, first occurrence on December 15, 2016.

pH: Maximum, 9.4 standard units, on many days, first occurrence on May 01, 2018; minimum, 5.3 standard units on many days, first occurrence on , May 15, 2018.

TURBIDITY: Maximum, 2260 formazin nephelometric units (FNU), May 15, 2018; minimum, 0.8 formazin nephelometric units (FNU), October 07, 2018.

MEAN VELOCITY FROM 1500kHz ACOUSTIC UNIT: Maximum, 2.92 feet per second, January 12, 2018; minimum, ICE -0.84 feet per second, on January 8, 2018.

ICE denotes an observation collected during a period of time when flow at the station was affected by ice