Last HWM Event

  • Storm of May 2016
  • Date: May 06, 2016
  • Storm Type: Mid-Latitude Cyclone
  • Max WL: 7.37(NAVD 88 Ft.)
  • HWMs recorded: 36

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Photo credit: National Weather Service

DE High Water Mark Database

High water marks (HWM), typically observed as water stains on buldings, debris lines on the beach, and as storm tides captured from automated sensors, are arguably the best method for capturing the maximum depth and extent of a flood for a large area.

This web site serves as a discovery tool for quickly accessing historically recorded high water marks from significant flooding events within Delaware.

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Data Access by Agency

Download Data

Download the full database of all HWM events.