USGS Water-Year Summary for Site 021720698

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean) [BOTTOM]
	00010 Temperature, water(Max.,Mean,Min.) [TOP]
	00065 Gage height(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean) [BOTTOM]
	00095 Specific cond at 25C(Max.,Min.,Mean) [TOP]
	00300 Dissolved oxygen(Max.,Min.,Mean) [(2)]
	00300 Dissolved oxygen(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

021720698 WANDO RIVER ABOVE MOUNT PLEASANT, SC

LOCATION - Lat 32°51'32", long 79°53'47" referenced to North American Datum of 1927, Charleston County, SC, Hydrologic Unit 03050201, on downstream side of bridge on Interstate 526, 4.0 mi north of Mount Pleasant, and at mile 2.3.

DRAINAGE AREA -

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1992 to September 1995, April 1997 to current year.

GAGE - Data collection platform. Datum of gage is 18.17 ft below NAVD of 1988.

REMARKS - Gage-height records are generally good to fair. Discharge records are generally good to fair except for estimated discharges, which are poor. Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-sc_nwisweb_data_inquiries@usgs.gov.

EXTREMES FOR PERIOD OF RECORD -

Maximum gage height, 24.70 ft, Sept. 11, 2017; minimum gage height, 12.09 ft, Mar. 13, 1993. Gage height affected by tide.

Maximum instantaneous discharge, 223,000 ft³/s on Nov. 24, 2018; Minimum instantaneous discharge, -193,000 ft³/s on Nov. 24, 2018

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1992 to 1995, 1997 to current year.

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE (TOP): July 1992 to September 1995, April 2004 to April 2005 (discontinued).
SPECIFIC CONDUCTANCE (MIDDLE): April 2004 to June 2009, September 2009 to current year.
SPECIFIC CONDUCTANCE (BOTTOM): February 1993 to September 1994, April 2004 to April 2005, June 2016 to current year.
WATER TEMPERATURE (TOP): July 1992 to September 1995, April 2004 to April 2005 (discontinued).
WATER TEMPERATURE (MIDDLE): April 1997 to June 2009, September 2009 to current year.
WATER TEMPERATURE (BOTTOM): February 1993 to September 1994, April 2004 to April 2005, June 2016 to current year .
DISSOLVED OXYGEN (TOP): July 1992 to September 1995, April 2004 to April 2005 (discontinued).
DISSOLVED OXYGEN (MIDDLE): April 1997 to June 2009, September 2009 to current year.
DISSOLVED OXYGEN (BOTTOM): February 1993 to September 1994, June 2016 to current year.

INSTRUMENTATION - Water-quality multiprobe and data collection platform.

REMARKS -
Sensor location "Top" is set to 3.0 ft below the water surface at all tide phases.
Sensor location "Middle" is static and set at gage height=-3.9 ft.
Sensor location "Bottom" is static and set at gage height = ### ft.

For the 2014 water year, specific conductance (MIDDLE) records rated good. 
For the 2014 water year, temperature (MIDDLE) records rated excellent. For the 2014 water year, dissolved oxygen (MIDDLE) records rated good. Prior to October 3, 2003 dissolved oxygen concentrations are not corrected for salinity.
For the 2015 water year, specific conductance (MIDDLE) records rated good. 
For the 2015 water year, temperature (MIDDLE) records rated good, except for Jun. 9-10 and Aug. 8-11, which are rated fair, and Jun. 11-16, which are rated poor. 
For the 2015 water year, dissolved oxygen (MIDDLE) records rated good.
For the 2016 water year, specific conductance (MIDDLE) records rated good except Jan. 6 - Mar. 13 which are rated poor. 
For the 2016 water year, temperature (MIDDLE) records rated excellent. 
For the 2016 water year, dissolved oxygen (MIDDLE) records rated excellent except Oct. 9 - Nov. 17, Mar. 14 - Apr. 13, and Jun. 29 - Jul. 26 which are rated good and Jan. 6 - Mar. 13 which are rated fair.
Prior to October 3, 2003 dissolved oxygen concentrations are not corrected for salinity.

EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE (TOP): Maximum, 44,600 microsiemens/cm, July 31, 2004; minimum, 5,280 microsiemens/cm, Oct. 14, 1994.

SPECIFIC CONDUCTANCE (MIDDLE): Maximum, 51,400 microsiemens/cm, Sept. 11, 2017; minimum, 10,900 microsiemens/cm, Oct. 8, 2015.

SPECIFIC CONDUCTANCE (BOTTOM): Maximum, 47,700 microsiemens/cm, Sept. 11, 2017; minimum, 21,700 microsiemens/cm, Oct. 9, 2016.

WATER TEMPERATURE (TOP): Maximum, 32.5°C, Aug. 17, 18, 1995: minimum, 6.0°C, Jan. 21-23, 1994.

WATER TEMPERATURE (MIDDLE): Maximum, 33.0°C, Aug. 1, 1999; minimum, 4.90°C, Jan. 5, 2018.

WATER TEMPERATURE (BOTTOM): Maximum, 31.9°C, July 23, 2020; minimum, 5.1°C, Jan. 5, 2018.

DISSOLVED OXYGEN (TOP): Maximum, 13.0 mg/L, Jan. 26, 1994; minimum, 2.3 mg/L, Aug. 27, 1992.

DISSOLVED OXYGEN (MIDDLE): Maximum, 12.7 mg/L, Jan. 11, 2001; minimum, 0.88 mg/L, July 10, 2023.

DISSOLVED OXYGEN (BOTTOM): Maximum, 11.5 mg/L, Feb. 4, 2021; minimum, 0.7 mg/L, Aug. 15, 2023