Local assumed datum was changed on October 1st, 2022. Prior to change, data were published in elevation in National Geodetic Vertical Datum 1929 (NGVD29).
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
3 data types available - data from 2022-10-01 to 2026-08-30
Daily data
2 data types available - data from 2015-10-01 to 2026-08-29
Field measurements
2 data types available - data from 2001-01-25 to 2026-08-10
Discrete sample data
31 Observed properties (data types) available - with data from 1959-12-08 to 1971-04-12
4 Sampling activities
Peak measurements
1 data types available - with data from 2022-10-01 to 2025-03-28
Statistical tables for select daily data types
2 data types available - data from 2015-10-01 to 2026-08-29
Monitoring locations with continuous data in last 120 days
No locations found
