Important Legacy real-time page
Available data
Select data types to graph from categories based on the way the data were collected.
Learn about the data collection categories Continuous data
4 data types available - data from 1990-10-01 to 2026-09-21
Daily data
4 data types available - data from 1944-05-22 to 2026-09-19
Field measurements
2 data types available - data from 1944-03-06 to 2026-09-02
Discrete sample data
133 Observed properties (data types) available - data from 1967-01-23 to 2015-07-22
756 Sampling activities
Peak measurements
2 data types available - data from 1933-08-01 to 2025-08-01
Statistical tables for select daily data types
4 data types available - data from 1944-05-22 to 2026-09-19
Important information about this monitoring location
LOCATION.-- On left bank at upstream side of highway bridge at Hollofield, 0.3 mi downstream from Dogwood Run, 3.0 mi north of Ellicott City, and 28 mi upstream from mouth. PERIOD OF RECORD.-- May 1944 to January 1992, March 1994 to September 1995, January 2000 to September 2004, April 2010 to current year. GAGE.-- Water stage recorder and crest-stage gage. Datum of gage is 186.92 ft above North American Vertical Datum of 1988. Prior to May 1, 2010, at site on downstream side of bridge at same gage datum. Prior to June 22, 1972, water-stage recorder at site on opposite bank at same gage datum. PERIOD OF RECORD (Water Quality).-- TURBIDITY: October 2010 to September 2015. SEDIMENT CONCENTRATION: October 2010 to September 2015. SEDIMENT LOAD: October 2010 to September 2015. REMARKS (Water Quality).-- Sediment discharge loads and concentrations were estimated for days of estimated daily discharges. Turbidity values greater than 1,600 nephelometric turbidity units (NTU) exceed the instrument calibration range. Values are included in the record but are presumed to have lower precision.
Monitoring locations with continuous data in last 120 days
No locations found
