USGS Water-Year Summary for Site 01021050

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	Available Parameters
	00010 Temperature, water(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: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01021050 ST. CROIX RIVER AT MILLTOWN, ME

LOCATION - Lat 45°10'12", long 67°17'48" referenced to North American Datum of 1983, Washington County, ME, Hydrologic Unit 01050001, on right bank 30 ft downstream from international highway bridge at Milltown.

DRAINAGE AREA - 1,455 mi².

REVISIONS HISTORY - WDR ME-96-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Water years 1969 to 1994, June 1996 to current year. CHEMICAL ANALYSES: Water years 1969 to August 1994 (discontinued).

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1969 to 1994, June 1996 to current year. CHEMICAL ANALYSIS: Water years 1969 to August 1994.

PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: July 1972 to September 1994, May 2023 to current year. Seasonal records (June to September) water years 1996 to 2023.

pH: July 1972 to September 1994, May 2023 to current year. Seasonal records (June to September) water years 1996 to 2023.

WATER TEMPERATURE: September 1969 to September 1994, May 2023 to current year. Seasonal records (June to September) water years 1996 to 2023.

DISSOLVED OXYGEN: September 1969 to September 1994, May 2023 to current year. Seasonal records (June to September) water years 1996 to 2023.

INSTRUMENTATION - In-situ monitor located 70 ft streamward from gage, and 1.5 ft above river bed.

REMARKS -

Water Year 2023: Monitor not operated during period October to May. Records good.

Water Year 2022: Monitor not operated during period October to May. Records good.

Water Year 2021: Monitor not operated during period October to May. Records good.

Water Year 2020: Monitor not operated during period October to May. Records good, except for specific conductance, which is fair.

Water Year 2019: Monitor not operated during period October to May. Records good.

Water Year 2018: Monitor not operated during period October to May. Records good.

Water Year 2017: Monitor not operated during period October to May. Records good.

Water Year 2016: Monitor not operated during period October to May. Records good.

Water Year 2015: Monitor not operated during period October to May. Records good, except for July 19-21, and Aug. 3, for specific conductance which are fair.

Water Year 2014: Monitor not operated during period October to May. No data for dissolved oxygen, Sept. 26-30. Records good.

EXTREMES FOR PERIOD OF DAILY RECORD - SPECIFIC CONDUCTANCE: Maximum, 375 microsiemens/cm, Mar. 6, 1989; minimum, 23 microsiemens/cm, May 2-4, 6, 1979. pH: Maximum, 11.6 standard units, Sept. 28, 1974; minimum, 5.3 standard units, Oct. 18, 1973. WATER TEMPERATURE: Maximum, 29.7°C, Aug. 08, 2018; minimum, 0.0°C, on many days during winter periods. DISSOLVED OXYGEN: Maximum, 14.4 mg/L, Nov. 16, 1976; minimum, 0.5 mg/L, Aug. 19, 1975, Aug. 28, 1980.