USGS Water-Year Summary 2024
015765195 BIG SPRING RUN NEAR MYLIN CORNERS, PA
LOCATION - Lat 39°59'45.37", long 76°15'50.54" referenced to North American Datum of 1983, Lancaster County, PA, Hydrologic Unit 02050306, on right bank, 0.35 mi upstream of bridge on Long Rifle Road and 0.26 mi downstream from intersection of Beaver Valley Pike (Rt. 741) and Gypsy Hill Road. September 24, 2008 to March 24, 2021, site was located 0.1 mi downstream.
DRAINAGE AREA - 1.68 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 2008 to current year.
GAGE -
Water stage recorder and crest-stage gage. Elevation of gage is 309 ft above North American Vertical Datum of 1988, from Lidar. September 24, 2008 to March 24, 2021, water-stage recorder and crest-stage gage at site 550 ft downstream on right bank at datum 4 ft lower. Datum of gage originally listed as "315 ft above National Geodetic Vertical Datum of 1929, from topographic map". Satellite telemetry at station.
COOPERATION - Station established and maintained by the U.S. Geological Survey in cooperation with Pennsylvania Department of Environmental Protection and Franklin and Marshall College.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
Specific Conductivity and Turbidity - April 2016 to current year.
Water Temperature - April 2013 to current year
INSTRUMENTATION - A YSI EXO2 multi-parameter probe installed at the site to continuously record water temperature, turbidity and specific conductance on a 15-minute interval. Beginning of Record to November 10, 2020, a YSI 600 OMS multi-parameter probe with 6136 sensor installed at the site to continuously record water temperature, turbidity and specific conductance on a 15-minute interval.
EXTREMES FOR PERIOD OF RECORD - WATER TEMPERATURE: maximum, 26.2 oC on Aug 8, 2018; minimum, -0.1 oC on Mar 14, 2017. SPECIFIC CONDUCTANCE: maximum, 3870 uS/cm on Dec 15, 2022 (road salt); minimum, 86 uS/cm on Sept 1, 2021. TURBIDITY: maximum: 1,190 FNU on Mar 31, 2017; minimum: <0.3 FNU on many days.