| Year | Type | Date | Effective Date | Letter Number | Subject | |
|---|
 2013 | |
| General Letter | |
| |  04/22/2013 | 06/01/2013 | G-2013-05 | Revisions to Job Special Provisions | |
| | 04/22/2013 | 06/01/2013 | G-2013-04 | Computer Stored Pay Items | |
| | 02/19/2013 | 04/01/2013 | G-2013-03 | Revisions to Engineering Policy Guide | |
| | 12/19/2012 | 01/01/2013 | G-2013-02 | Revisions to Engineering Policy Guide | |
| Specifications Letter | |
| | 04/22/2013 | 06/01/2013 | S-2013-05 | Revised Supplement to Standard Specifications | |
| | 04/18/2013 | 05/01/2013 | S-2013-04 | Revised Supplement to the Standard Specifications | |
| | 03/13/2013 | 04/01/2013 | S-2013-03 | Revised Supplement to the Standard Specifications | |
| | 02/28/2013 | 04/01/2013 | S-2013-02 | Revised Supplement to the Standard Specifications | |
| | 12/19/2012 | 01/01/2013 | S-2013-01 | Revised Supplement to the Standard Specifications | |
| Standard Plans Letter | |
| | 04/22/2013 | 06/01/2013 | P-2013-03 | Supplemental Revisions to Missouri Standard Plans for Highway Construction | |
| | 02/19/2013 | 04/01/2013 | P-2013-02 | Supplement Revisions to Missouri Standard Plans for Highway Construction | |
| | 12/19/2012 | 01/01/2013 | P-2013-01 | Supplemental Revisions to Missouri Standard Plans for Highway Construction | |
| 2012 | |
| General Letter | |
| | 10/08/2012 | 11/01/2012 | G-2012-09 | Computer Stored Pay Items | |
| | 10/08/2012 | 11/01/2012 | G-2012-08 | Revisions to Job Special Provisions | |
| | 10/08/2012 | 11/01/2012 | G-2012-07 | Revisions to the Engineering Policy Guide | |
| | 07/25/2012 | 08/01/2012 | G-2012-06 | Revisions to Engineering Policy Guide | |
| | 07/01/2012 | 08/01/2012 | G-2012-05 | Computer Stored Pay Items | |
| | 04/16/2012 | 05/01/2012 | G-2012-04 | Revisions to Engineering Policy Guide | |
| | 02/24/2012 | 03/01/2012 | G-2012-03 | Revisions to Supplemental Specifications to 2011 Missouri Standard Specifications for Highway Construction | |
| | 01/30/2012 | 02/01/2012 | G-2012-02 | Revisions to Engineering Policy Guide | |
| | 01/30/2012 | 02/01/2012 | G-2012-01 | Revisions to Job Special Provisions | |
| Specifications Letter | |
| | 10/08/2012 | 11/01/2012 | S-2012-04 | Revised Supplement to the Standard Specifications | |
| | 07/25/2012 | 08/01/2012 | S-2012-03 | Revised Supplement to the Standard Specifications | |
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