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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
03501975 LITTLE TENNESSEE RIVER AB NC HWY 28 AT IOTLA, NC
LOCATION - Lat 35°13'58.3", long 83°23'29.3" referenced to North American Datum of 1983, Macon County, NC, Hydrologic Unit 06010202, on Secondary Road 1335, 0.25 mile upstream from junction of NC Hwy 28 at bridge crossing Little Tennessee River.
DRAINAGE AREA - 323 mi². (measured by TVA from topographic maps, scale 1:24,000). Basin is fairly well populated except the small portion that lies within the Nantahala National Forest; generally characterized by small farms in the valleys, woodland on the steep slopes. There are several small towns and communities scattered throughout the basin. The mean annual precipitation is 55-65 inches.
REVISIONS HISTORY - Gage datum was revised on October 01, 2021 based on an error in the determination of the gage datum.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 2012 to current year.
GAGE - Water-stage recorder. Datum of gage is 1958.64 ft above North American Vertical Datum of 1988. Satellite telemetry at streamgage.
REMARKS -
Considerable fluctuation caused by Porters Bend Power Plant at Lake Emory, 2.5 mi upstream.
Gage-height records are generally good. Discharge records are generally good except for estimated discharges, which are fair. Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-nc_nwisweb_data_inquiries@usgs.gov.
WATER-QUALITY RECORDS
PERIOD OF RECORD - December 20, 2013 to January 7, 2016.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: December 2013 to January 2016. SPECIFIC CONDUCTANCE: December 2013 to January 2016. TURBIDITY: December 2013 to January 2016.
INSTRUMENTATION - Water Quality monitor with satellite telemetry from December 2013 to January 2016.
EXTREMES FOR PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Maximum recorded, 28.1°C, July 31, 2015; minimum recorded, 0.0°C, several days during winter months. SPECIFIC CONDUCTANCE: Maximum recorded, 62 microsiemens, February 17, 2015; minimum recorded, 17 microsiemens, December 23, 2013. TURBIDITY: Maximum recorded, 610 FNU'S, October 14, 2014; minimum recorded, 0.7 FNU'S, December 14, 2014.
