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Water-Year Summary for Site 08149900

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Available Parameters
00060 Discharge(Max.,Min.,Mean)  
00065 Gage height(Max.,Min.,Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
08149900 South Llano River at Flat Rock Lane at Junction, TX
LOCATION - Lat 30°28'44.45", long 99°46'40.94" referenced to North American Datum of 1983, Kimble County, TX, Hydrologic Unit 12090204, approximately 4.88 mi upstream from USGS station 08150000.
DRAINAGE AREA - 879 mi². Drainage area = 880 square miles found on South Llano River Bridge Layout FM 2169 plans dated 2010/01/13. This bridge is where the gage is located.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 2012 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,677.37 ft. above NAVD88. Satellite telemeter at station.
COOPERATION - Texas State Soil and Water Conservation Board (TSSWCB)
REMARKS - Low flow at the gage is affected to an unknown degree by multiple low water crossings including but not limited to about 4.2mi, 10.1mi, 11.7mi, 14.4mi, 15.9mi, & 17.6mi upstream of the site. At about 19.1mi upstream of the gage is the confluence of the South Llano River and Paint Creek. A low water check dam is located on Paint Creek about 0.3mi upstream of this confluence forming Paint Creek Ranch Lake.
EXTREMES OUTSIDE PERIOD OF RECORD - None known.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 66,700 ft³/s (Gage-height, 27.27 ft., from floodmark), Oct. 08, 2018, by slope area measurement. Minimum discharge, 25.9 ft³/s, gage-height 1.99 ft., Aug. 19, 2023.