Flood Inundation Map Available
--01553500 WEST BRANCH SUSQUEHANNA RIVER AT
--Lat 40`58'05", long
76`52'25", Northumberland County, Hydrologic Unit 02050206, at
downstream side of left abutment of Market Street bridge on State
Highway 45 at Lewisburg, 0.2 mi downstream from Buffalo Creek, and 7.4
mi upstream from mouth.
--6,847 square miles.
PERIOD OF RECORD.
--October 1939 to current year.
September 1913 to August 1923 (gage heights only), are contained in
reports of Water Supply Commission of Pennsylvania or Pennsylvania
Department of Forests and Waters.
--Water-stage recorder. Datum of gage is 428.20
ft above National Geodetic Vertical Datum of 1929. Sept. 21, 1913, to
Aug. 31, 1923, Dec. 7, 1939, to July 2, 1940, and Oct. 20, 1987, to
Sept. 30, 1988, nonrecording gage at same site and datum. Since Oct. 1,
1942, water-stage recorder for Susquehanna River at Sunbury (station
01553990) used as an auxiliary gage.
--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
and the U.S. Geological Survey.
GAGE HEIGHTS OF IMPORTANCE
Supplied by USGS
: Maximum recordable gage height
(stage sensor operational limit) - 37.5 ft; Data transmitter
operational limit - 38.9 ft;
Supplied by NWS
: Action stage-14 ft; Flood stage - 18
ft, the left, or east bank overflows; low lying areas will flood;
Moderate flood stage-23 ft, the mobile home park along Rte 405
downstream of bridge will flood; Major flood stage-28 ft, the right, or
west bank overflows and affects Lewisburg; widespread inundation on
left bank affects several mobile home parks; many residences and
businesses on both banks affected by flood waters;