USGS Water-Year Summary for Site 01650800

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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(Min.,Max.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Mean,Min.)
	63680 Turbidity, Form Neph(Max.) [TS087, Discontinued]
	63680 Turbidity, Form Neph(Mean,Min.) [YS087, Discontinued]

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Water year 2025: 2025-10-01 to 2026-09-30

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USGS Water-Year Summary 2025

01650800 SLIGO CREEK NEAR TAKOMA PARK, MD

LOCATION - Lat 38°59'10.4", long 77°00'17.5" referenced to North American Datum of 1983, Montgomery County, MD, Hydrologic Unit 02070010, 0.5 mi northwest of Takoma Park, 0.7 mi upstream from confluence with Long Branch, 2.0 mi upstream from mouth.

DRAINAGE AREA - 6.45 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2008 to current year.

GAGE - Water-stage recorder, crest-stage gage and concrete control. Datum of gage is 161.37 ft above North American Vertical Datum of 1988.

REMARKS -

Water Years 2018-2024: Records fair, except those for estimated discharges, which are poor.

Water Year 2017: Records fair, no estimated discharges.

Water Year 2016: Records fair, except those for estimated daily discharges, which are poor.

Water Years 2014-2015: Records good, except those for estimated daily discharges, which are poor.

Water Year 2013 and prior years' accuracy statements can be found in Annual Water Data Reports.

U.S. Geological Survey satellite data-collection platform at station.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE, UPSTREAM: June 2012 to April 2013 (discontinued). SPECIFIC CONDUCTANCE, DOWNSTREAM: March 2013 to current year. WATER TEMPERATURE, UPSTREAM: June 2012 to April 2013 (discontinued). WATER TEMPERATURE, DOWNSTREAM: March 2013 to current year. pH, UPSTREAM: June 2012 to April 2013 (discontinued). pH, DOWNSTREAM: March 2013 to current year. TURBIDITY, UPSTREAM: June 2012 to April 2013 (discontinued). TURBIDITY, DOWNSTREAM: March 2013 to current year. DISSOLVED OXYGEN, UPSTREAM: June 2012 to April 2013 (discontinued). DISSOLVED OXYGEN, DOWNSTREAM: March 2013 to current year.

COOPERATION - Funding for water-quality data collection is provided by the Montgomery County Department of Environmental Protection and the U.S. Geological Survey.

INSTRUMENTATION - Water-quality monitor June 2012 to current year.

REMARKS -

Turbidity values greater than 1,000 formazin nepthelometric units (FNU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision.

The accuracy limit of the turbidity sensor in low turbidity water is +/- 0.3 FNU.

October 1, 2024:
Values are censored and qualified as Less Than (<) 0.3 FNU if they are recorded below 0.3 FNU.

Missing record due to periodic instrument malfunction. UPSTREAM, data collected 10 feet upstream of low-head dam; data ended on April 15, 2013 when the sonde was removed. DOWNSTREAM, data collected about 50 feet downstream of low-head dam. The DOWNSTREAM data is considered the primary data starting March 23, 2013.

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 28.6 degC, July 10, 2024; Minimum, -0.6 degC, on February 22, 2015.

SPECIFIC CONDUCTANCE: Maximum, 17,500 microsiemens per centimeter, January 03, 2014; Minimum, 27 microsiemens per centimeter, first occurrence on September 06, 2022.

pH: Maximum, 10.0 standard units, March 9 and 10, 2014; Minimum, 6.6 standard units, on several days, 2016 (January 23,24 and 25; February 16 and 17).

DISSOLVED OXYGEN: Maximum, 17.6 milligrams per liter, March 14, 2014; Minimum, 4.6, May 21, 2014.

TURBIDITY:
Active Sensor (July 10, 2019 - present): Maximum, 961 formazin nephelometric units (FNU), August 09, 2024; Minimum, 0.0 formazin nephelometric units (FNU), first occurrence on September 11, 2021.

Active Sensor (March 23, 2013 - July 10, 2019): Maximum, 1,530 formazin nephelometric units (FNU), July 20, 2012; Minimum, 0.0 formazin nephelometric units (FNU), on several days in 2012, 2013, 2014, 2015 and 2016