ATTENTION!!! Please be
aware that the sharp rises and drops in the graphs displayed for some
of the Allegheny River gages are being caused by hydroelectric power
producers passing relatively large amounts of streamflow.
STATION.--03049500 ALLEGHENY RIVER AT NATRONA,
LOCATION.--Lat 40`36'55", long
79`43'07", Allegheny County, Hydrologic Unit 05010009, on
right bank 520 ft upstream from dam at lock 4 at Natrona, 5.8 mi
downstream from Kiskiminetas River, and at mile 24.3.
DRAINAGE AREA.--11,410 mi2, approximately.
PERIOD OF RECORD.--October 1938 to current year.
GAGE.--Water-stage recorder and concrete dam control.
Datum of gage is 736.36 ft above National Geodetic Vertical Datum of
1929. (U.S. Army Corps of Engineers bench mark). Prior to Apr. 14,
1940, nonrecording gage and Apr. 15, 1940 to Oct. 22, 1990, water-stage
recorder at same site at datum 0.75 ft higher.
REMARKS.--U.S. Army Corps of Engineers satellite
telemeter at station.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Mar. 18,
1936 reached a stage of 32.06 ft, discharge, 365,000 ft3/s, determined
by U.S. Army Corps of Engineers.
GAGE HEIGHTS OF IMPORTANCE.-
Supplied by NWS: Action stage-17.2 ft; Flood stage-21
ft; Moderate flood stage-24 ft; Major flood stage-26 ft.
COOPERATION.--Station established and maintained by
the U.S. Geological Survey. Funding for the operation of this station
is provided by the Pennsylvania Department of Environmental Protection,
the U.S. Army Corps of Engineers, Pittsburgh District and the U.S.
Geological Survey through the National Streamflow Information Program
and the Cooperative Water Program.