WHAT'S NEW?
2026 Edition Revisions
The 2026 editions of the SUDAS manuals are posted. Remember, we do not print and mail revision packets. Electronic versions of the revision packets can be found under Design Manual -> Latest Design Revisions or Specifications Manual -> Latest Specifications Revisions.
The manual pages are fully updated.
Progress Payment Retainage
Per Senate File 574, Iowa Code Section 573 was recently changed, lowering the maximum amount of progress payment retainage from 5% to 3%. To match Iowa DOT, this change would apply for contracts let July 1, 2025 and after. The Specifications have been updated accordingly.
Iowa DNR Review
The Iowa DNR Water Supply Engineering Section conducted a review of the 2025 Edition of SUDAS Specifications Divisions 3 and 5. In a letter addressed to SUDAS staff, Iowa DNR stated “at the current time, they are largely in accordance with the design standards of this Department and will be filed accordingly.” Click here for a copy of the letter.
Modifying the SUDAS Manuals
If you need to modify the SUDAS manuals to meet your jurisdiction’s needs, please read this document first.
SUDAS Email List
Anyone who would like to receive emails from us can subscribe to our list.
Temporary Traffic Control
SUDAS staff developed the Temporary Traffic Control Handbook through an Iowa Highway Research Board project. Click here for an electronic version of the handbook.
Potential Errors
If you notice something within the SUDAS Manuals that appears to be an error, please contact Beth Richards (brich@iastate.edu) and let her know.