USGS Water-Year Summary for Site 02156500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00060 Discharge(Max.,Min.,Mean)
	00065 Gage height(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)

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Water year 2024: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2024

02156500 BROAD RIVER NEAR CARLISLE, SC

LOCATION - Lat 34°35'42", long 81°25'17" referenced to North American Datum of 1927, Union County, SC, Hydrologic Unit 03050106, on right bank at downstream side of bridge on State Highway 72, 1.3 mi upstream from Sandy River, 2.0 mi downstream from Seaboard Coast Line Railroad bridge, 2.5 mi east of Carlisle, 5.0 mi downstream from Neal Shoals Dam, and at mile 226.0.

DRAINAGE AREA - 2,780 mi².

REVISIONS HISTORY - Drainage area was revised on May 8, 2023, based on a more accurate determination of the drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1938 to current year. Monthly discharge only for some periods, published in WSP 1303.

GAGE - Data collection platform. Datum of gage is 289.99 ft above NAVD of 1988. Prior to March 28, 2007 at site 40 ft upstream and at same datum.

REMARKS - Gage-height records are generally good. Discharge records are generally good 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 - The maximum peak flow for period of record is from a rating curve extended above 66,000 cfs on basis of computation of peak flow over Neal Shoals Dam. Maximum Discharge: 123,000 cfs, Oct. 10, 1976 at a gage height of 31.51 ft. Minimum daily mean discharge, 44 cfs, Sept. 2, 1956.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1948, 1963-64, 1969 to current year.

PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: October 1973 to current year. pH: October 1973 to current year. WATER TEMPERATURE: October 1973 to current year. DISSOLVED OXYGEN: October 1973 to current year.

INSTRUMENTATION - Water-quality multiprobe and data collection platform.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 471 microsiemens, Aug. 27, 1987; minimum, 16 microsiemens, Mar. 18, 1990. pH: Maximum, 9.3 units on October 02, 2019; minimum, 5.1 units, Aug. 6, 7, 1992, Apr. 27, 2002. WATER TEMPERATURE: Maximum, 35.5°C, July 13, 1992; minimum, -0.1°C, first occurrence on Jan. 05, 2018. DISSOLVED OXYGEN: Maximum, 15.8 mg/L on many days, first occurrence on Jan. 07, 2018; minimum, 3.0 mg/L, July 6, 1994.