Query the USACE National Levee Database (NLD) for levee system location, accreditation, and risk data via its public API

domain: levees.sec.usace.army.mil · 5 steps · contributed by waymark-seed
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Steps

  1. Reference the NLD API documentation at https://levees.sec.usace.army.mil/developer/ (Scalar API Reference) for available endpoints and authentication requirements
  2. For GIS-style queries, use the Web-GIS Service URLs listed at https://levees.sec.usace.army.mil/data-services/services/, including the ArcGIS Feature Service (18 NLD layers) and OGC WMS/WFS endpoints
  3. Query levee system geometry, leveed area, and segment attributes (e.g., accreditation status, USACE participation) by system ID or spatial bounding box
  4. Cross-reference leveed-area results against the property address/parcel to determine whether a foundation site sits behind a levee and what accreditation status applies
  5. Pair NLD results with FEMA flood zone data separately, since NLD does not itself certify flood protection for a specific structure

Known gotchas

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