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Water-Year Summary for Site 03277200

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00010 Temperature, water(Max.,Min.,Mean)  
00010 Temperature, water(Max.,Min.,Mean)  
00010 Temperature, water(Max.,Min.,Mean)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
32315 Relative fChl, water, in situ(Max.,Min.)  
32316 fChl, water, in situ(Max.,Mean,Min.)  
32319 fPC, water, in situ(Max.,Mean,Min.)  
32321 Relative fPC, water, in situ(Max.,Mean,Min.)  

Water year 2025: 2025-10-01 to 2026-09-30
 
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USGS Water-Year Summary 2025
03277200 OHIO RIVER AT MARKLAND DAM NEAR WARSAW, KY
LOCATION - Lat 38°46'30.9", long 84°58'20.6" referenced to North American Datum of 1983, Gallatin County, KY, Hydrologic Unit 05090203, on left bank at downstream end of lock guide wall in lower pool at Markland Dam, 0.4 miles upstream from Stephens Creek, 3.4 miles west of Warsaw, and at mile 531.5.

Boat ramp at Vevay, IN:  38°44'39"N, 85°03'51"W (using Google Maps, 02/06/2020)
DRAINAGE AREA - 83,170 mi².
REVISIONS HISTORY - WDR KY-88-1: 1987.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1970 to current year.
GAGE - Water-stage recorder with telemetry in tailwater gage. Datum is 406.65 feet above NAVD of 1988, 407.26 ft above NGVD of 1929, and 408.00 above Ohio River Datum (COE 1912).   Datum of headwater gage 0.5 miles upstream is 441.65 feet above NAVD of 1988, 442.26 feet above NGVD of 1929, and 443.00 feet Ohio River datum.  Records of Markland Dam gate operations, headwater gage readings, and turbine flow are furnished by U.S. Army Corps of Engineers.
COOPERATION - U.S. Army Corps of Engineers, Louisville District.
REMARKS - Flow regulated by Ohio River system of locks, dams, and reservoirs upstream from station.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Jan. 26, 1937, reached a stage of 76.1 feet (tailwater gage).
EXTREMES FOR PERIOD OF RECORD - Maximum gage height 60.72' on March 6, 1997; maximum discharge 582000 ft³/s on March 6, 1997. Lowest daily mean discharge 2790 on August 30, 2015.
WATER-QUALITY RECORDS
PERIOD OF RECORD -

UPSTREAM HYDRO Temperature, Dissolved Oxygen, pH, Specific Conductance: February to October 2011, March to October 2012, March to October 2013, March to October 2014, February to November 2015, April 1 to November 1, 2016, March 16 to November 2, 2017, March 27, 2018 to November 1, 2018, March 26, 2019 to November 1, 2019, and March 24, 2020 to November 9, 2020.

 DOWNSTREAM HYDRO Temperature, Dissolved Oxygen, Specific Conductance: February to October 2011, March to October 2012, March to October 2013, March to October 2014, and February to November 2015, April 1 to November 1, 2016, March 17 to November 2, 2017, March 27, 2018 to November 1, 2018, March 26, 2019 to November 1, 2019, and March 24, 2020 to November 9, 2020.

UPSTREAM LOCK Temperature, Dissolved Oxygen, Specific Conductance: February to October 2011, March to October 2012, March to October 2013, March to October 2014, and February to November 2015. 

DOWNSTREAM LOCK Temperature, Dissolved Oxygen, Specific Conductance: February to October 2011, March to October 2012, March to October 2013, March to October 2014, and February to November 2015.

COOPERATION - Duke Energy, Indiana Inc.
EXTREMES FOR PERIOD OF RECORD -

UPSTREAM HYDRO: Feb 2011- Nov 2024:

SPECIFIC CONDUCTANCE: Maximum recorded, 612 microsiemens, September 30, and October 2, 2012; minimum recorded, 210 microsiemens, 4/16/24.

pH: Maximum recorded, 8.89 units, July 13, 2018; minimum recorded, 4.5 units, August 11, 2013.

WATER TEMPERATURES: Maximum recorded, 31.5 C, July 31, 2011, minimum recorded, 0.1 C, February 25, 2015 and March 2, 2015.

DISSOLVED OXYGEN: Maximum recorded, 14.7 mg/L, February 27 & 28, 2015; minimum recorded, 0.0 mg/L, August 15, 2015, July 22, 24-25,  September 19, 2016, and August 26, 2017 (during turbine shutdown*), August 29, 2019 (during turbine shutdown*).

* Multiple occurrences of the same extreme during turbine shutdowns. First occurrence listed.

DOWNSTREAM HYDRO: Feb 2011- Nov 2024:

SPECIFIC CONDUCTANCE: Maximum recorded, 566 microsiemens, October 20, 2016; minimum recorded, 210 microsiemens, April 16, 2024.

WATER TEMPERATURES: Maximum recorded, 31.2 C, August 2, 4, 2011, minimum recorded, 0.1 C, February 25, and March 2, 2015.

DISSOLVED OXYGEN: Maximum recorded, 15.0 mg/L, February 27, 2015, February 16-17, 2011; minimum recorded, 2.9 mg/L, September 13, 2016.

MARKLAND L&D - UPSTREAM: Feb 2011- Nov 2015:

SPECIFIC CONDUCTANCE: Maximum recorded, 584 microsiemens, October 2, 2012; minimum recorded, 212 microsiemens, March 14, 2011.

WATER TEMPERATURES: Maximum recorded, 32.4 C, August 1, 2011, minimum recorded, 1.9 C, February 10, 2011.

DISSOLVED OXYGEN: Maximum recorded, 13.8 mg/L, February 17, 2011; minimum recorded, 2.4 mg/L, May 19, 20, 2012.

MARKLAND L&D - DOWNSTREAM: Feb 2011- Nov 2015:

SPECIFIC CONDUCTANCE: Maximum recorded, 582 microsiemens, October 2, 2012; minimum recorded, 205 microsiemens, March 7, 2012.

WATER TEMPERATURES: Maximum recorded, 31.3 C, August 3, 2011, minimum recorded, 2.1 C, February 10-12, 2011.

DISSOLVED OXYGEN: Maximum recorded, 14.2 mg/L, February 12-17, 2011; minimum recorded, 3.0 mg/L, August 8, 2011.