Yakima County WA Public Services Homepage


Levees are earth structures that keep elevated waters from flooding interior lowlands. Yakima County has 21.8 miles of levees. 15.1 Levee miles are certified by the Army Corps of Engineers for different flood level events, and are maintained per Corps requirements, while the rest are orphan levees that have no certification.

Levee Facts

  • 8.6 miles of Authorized Federal Levees
  • 6.5 miles of PL84-99 Certified Levees
  • 6.7 miles of Non-Certified "Orphan" Levees
  • City of Yakima and Terrace Heights are protected to 100 year flood event

Sediment Facts

  • Disrupted river processes
  • Lateral constraint
  • River attack at constraints
  • Reduced area for sediment deposition


PL84-99 Project Maps: Non-Federal Levees Systems in the Federal Program

Levee Owner’s Manual for Non-Federal Flood Control Works

The Levee Owner’s Manual (PDF) for PL84-99 was written specifically for the public sponsors of non-Federally constructed levees, floodwalls, channels, and other Flood Control Works. It describes the proper operation and maintenance of these structures, and the assistance the U.S. Army Corps of Engineers can provide before, during, and after a flood.

Flood Plain Levees Map
2004 Infrastructure Overlay on 1927 Photo
How a Levee Works Image
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