STATION.--03108500 OHIO RIVER AT MONTGOMERY LOCK & DAM, LOWER POOL
LOCATION.--Lat 40`38'50", long 80`23'20", water quality sonde located on the right downstream lock wall at Lat 40`39'8.21", Long 80`23'12.78", Beaver County, Hydrologic Unit 05030101.
DRAINAGE AREA.--22,960 square miles.
PERIOD OF RECORD.--July 2007 to current year.
GAGE.--Water-stage recorder near left bank, water quality monitor near right bank. Previous to November 7, 2022, water quality data was collected at upstream site 03108490 near left bank. Elevation of gage is 652.16 ft above North American Vertical Datum of 1988 (from benchmark). Prior to March 12, 2024, the datum of gage was reported as 652.5 ft above National Geodetic Vertical Datum of 1929 (NGVD29) or erroneously reported as 653.6 ft above NGVD29 depending on source. Satellite telemetry at station.
COOPERATION.--Station maintained by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers, Pittsburgh District.
REMARKS.--Satellite telemetry at station.