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Continuous data graphs Susquehanna River Near Darlington, MD - USGS-01579550

Important for you to know:

  • Big changes are coming soon to NWISWeb websites and services. Attend our webinar, January 15, 2026 at 2:00 PM EST, to learn about the impacts. Learn more about our modernization plans and timeline.
  • Scheduled Maintenance Notice
    USGS will be performing maintenance on the time series data processing system beginning at 08:00 EST on January 13, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 3 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.

Location context and information

The established standard operating procedures for instrument maintenance are modified at this site because access to the monitoring equipment may be delayed due to extended periods of elevated river water stage.

Graphs for all available data types

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