STATION.--01576500 CONESTOGA RIVER AT LANCASTER, PA
LOCATION.--Lat 40`03'00", long 76`16'39", Lancaster County, Hydrologic Unit 02050306, on left bank at Penn Central Railroad bridge, 50 ft downstream from small right-bank tributary, and 0.7 mi east of Lancaster.
DRAINAGE AREA.--324 square miles.
PERIOD OF RECORD.--October 1928 to March 1932; August, September 1932; April 1933 to current year. Prior to October 1973, published as Conestoga Creek at Lancaster.
GAGE.--Water-stage recorder, crest-stage gage, Pluvio precipitation gage and concrete control. Datum of gage is 245.63 ft above National Geodetic Vertical Datum of 1929. Prior to May 1, 1933, at site 600 ft upstream at different datum, excluding small tributary.
COOPERATION.--Funding for the operation of this station is provided by Exelon Generation, the Pennsylvania Department of Envirnomental Protection and the U.S. Geological Survey.
REMARKS.--Power plants, gristmills, and pumping plant upstream cause slight regulation as a whole, and may cause rather large fluctuations in stage at times. Water supply for the City of Lancaster is diverted just upstream from gage.

The 15-minute precipitation and air temperature data for this station are temporary and will only be displayed for 120 days. Time series of 1-hour or cumulative daily values will NOT be available for retrieval following the 120-day display period. Although the instrumentation is calibrated at least once a year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.

GAGE HEIGHTS OF IMPORTANCE.-
Supplied by USGS: Data transmitter operational limit - 22.0 ft;
Supplied by NWS: Action stage-9 ft; Flood stage-11 ft, Grofftown Road will flood; Moderate flood stage-13 ft, several homes are affected by high water; Major flood stage-15 ft, many homes near the river area affected by high water.