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United States Department of Agriculture
Natural Resources Conservation Service

2118 W. Park Court, Champaign, IL 61821
Phone: 217/353-6600 Fax: 217/353-6676 Website:

DATE: December 4, 2012

SUBJECT:  National Engineering Handbook (NEH), Part 650, Engineering Field Handbook (EFH)

Purpose:  To update an existing Illinois supplement in EFH Chapter 6 on 4100 series reinforced concrete drop spillways.

Expiration Date:  Upon receipt

Explanation: This notice updates the requirements for reinforcing steel in the 4100 series reinforced concrete drop spillway standard design to current structural standards, and documents existing limitations on use. The Illinois NRCS engineering website will be updated to include the new Illinois supplement at

Filing Instructions:

Holders of hardcopy Engineering Field Handbook binders should:

  1. Discard existing IL supplement 6-12.1a and 6-12.1b, but retain the remainder of the existing supplement.
  2. Print out the attached supplement on green paper and file in the EFH, after page 6-12.

Any questions regarding this submittal should be directed to the Area Engineer.

Ivan Dozier
State Conservationist

DIST: All IL NRCS Employees
          All IL District Employees



This attachment requires  Adobe Acrobat Reader to view: 
EFH-Notice 57.pdf  [PDF, 88 kb]

Attachment 6-12.1a and b
6-12_1a_b.pdf (PDF, 155 kb)

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