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Water-Year Summary for Site 15129280

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Available Parameters
00010 Temperature, water(Min.,Max.,Mean)  
00060 Discharge(Mean)  

Water year 2025: 2025-10-01 to 2026-09-30
 
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USGS Water-Year Summary 2025
15129280 Italio River above mouth near Yakutat, AK
LOCATION - Lat 59°18'07.3", long 139°02'44.5" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 SW 1/4 sec.020, T.30 S., R.37 E., City & Borough of Yakutat, AK, Hydrologic Unit 19010405,
DRAINAGE AREA - 25.4 mi².  
SURFACE-WATER RECORDS
PERIOD OF RECORD - Gage was started on 4/15/2019, currently running.  
GAGE - Water-stage recorder. Datum of gage is -1.0 ft NAVD88.
WATER-QUALITY RECORDS
INSTRUMENTATION -

Water Temperature:  The water-temperature probe is a USGS HIFF approved/provided/calibrated Forest Technology Systems Digi-Temp submersible temperature sensor used for continuous measurements. Thermistor is encapsulated in a 0.65-inch diameter, Delrin housing with a molded end loop. The sensor is fished through 1-inch aluminum flex-conduit into water channel affixed to modified metal pipe for protection with openings for water to free flow. It has a measurement range of -5 to +45 degrees C with an accuracy of +/- 0.2 degrees C. The Digi-Temp connects via three wire terminations directly to a Sutron 522 datalogger’s SDI-12 input. The instrument logs in-situ-samples at 15 minutes time periods, stored in datalogger.  At time of each inspection, temperature is checked against reference hand-held sensor (Digi-Temp) that is additionally calibrated against a NRST “traceable” mercury stem thermometer and within 0.2 deg C at time of annual calibration checks.  If corrections are required to time-series records that are made against the difference of the reference thermistor. 

EXTREMES FOR PERIOD OF RECORD - Extreme for period of record for WT occurred on 8/4/2023 at 13.6 Deg C.