Active Design Memos
Design Memos are published between the first Monday and subsequent Thursday of each month. All revisions to the Design Manual described in these memos have been incorporated into the current Indiana Design Manual (IDM). Memos appear on this page for a period of 1 year following the date of the memo. After 1 year, they are moved to the Archived Design Memos page. Memos that include a recurring special provision (RSP) or recurring plan detail (RPD) remain on this page as long as the associated RSP/RPD remains active. Superseded memos are archived immediately. The practice of distinguishing policy memos from techncial advisories was discontinued January 2018. This Page Last Updated 06/14/2023 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 23-06 | 06/19/23 | Cross Slope Correction.pdf | IDM Chapter 54-3.03(01), Chapter 55-4.05(04), Chapter 56-4.04(03), Chapter 603-2.04, and Chapter 607-1.0 | Lettings on or after September 1st, 2023 |
| 23-05 | 06/14/23 | Standardized Elastomeric Bearing Revisions | IDM Chapter 409-7.03(03), 409-7.04, and Figures 409-7A thru 409-7E | Stage 3 submittals on or after September 1st, 2023 |
| 23-04 Rev. | 05/12/23 rev. 05/30/23 | Chapter 503 Revisions | IDM Chapter 503-1.0, 503-2.0, 503-2.01, 503-2.02, 503-2.02(01), 503-2.02(02), 503-2.04, 503-2.04(01) thru 503-2.04(04), 503-2.05(01) thru 503-2.05(05), 503-2.06(01), 503-2.07, 503-3.01(01), 503-3.01(03), 503-3.01(04), 503-3.02, 503-3.04, 503-3.04(02) thru 503-3.04(04), 503-3.05(02), 503-3.05(04), 503-3.05(07), 503-4.01, 503-4.02, 503-6.01, 503-7.01(02), 503-701(03), 503-7.01(05), 503-7.02, 503-7.02(01), 503-7.02(04), 503-7.02(05), 503-7.03(01), 503-7.04(02), 503-7.05, 503-7.07, and 503-7.07(01) thru 503-7.07(04) (new) Figures 503-3G and 503-3H (new) | Stage 1 submittals on or after September 1st, 2023 |
| 23-03 | 05/12/23 | Stormwater Management | IDM Chapter 14-2.01(07), 14-2.03(03), 14-2.03(10), 14-2.04(06), 14-2.05(03) , 14-2.05(05), 17-6.02, 17-6.03, 17-6.04 and 205-4.0 | Lettings on or after September 1st, 2023 |
| 23-02 | 05/12/23 | Void Reducing Asphalt Membrane for Asphalt Paving | IDM Chapter 602-3.02 | For lettings on or after May 1, 2024 |
| 23-01 | 01/05/23 | Outlet Protection | IDM Chapter 203-2.02(15) & Figure 203-2D | Stage 3 submittals on or after March 24, 2023 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 22-25 | 12/19/22 | Infrastructure Investment and Jobs Act - Build America, Buy America | N/A | Lettings on or after April 12, 2023 |
| 22-24 Rev. | 12/19/22 rev. 02/08/23 | Cutoff Walls for Box Culverts | IDM Chapter 203-2.03(04) | Immediately |
| 22-23 | 11/10/22 | Engineering Assessment Manual Revisions | N/A | Stage 1 submittals on or after February 1st, 2022 |
| 22-22 | 11/10/22 | Post-construction Stormwater Management | IDM Chapter 204 | As Noted |
| 22-21 | 10/07/22 | Deck Pour Sequence for Prestressed Beam Superstructures | IDM Chapter 404-2.06(02) & Figure 404-2F | Stage 3 submittals on or after November 1st, 2022 |
| 22-20 | 10/06/22 | Surface Seal for Concrete Structural Members | IDM Chapter 17-5.01(03) | Stage 3 submittals on or after November 1st, 2022 |
| 22-19 | 09/13/22 | Welded Wire Reinforcement (WWR), Lightweight Concrete, and Continuity for Prestressed Beams | IDM Chapter 406, 406-4.02, 406-4.03, 406-4.04, 406-5.01, 406-10.0, 406-12.02(01), 406-12.02(02), 406-12.02(03), 406-12.03(01), 406- 12.03(03), 406-12.04(02), 40612.05, 406-12.06, 406-12.08, 406-12.09, Figures 406-12B (del.), 406-12C (new), 406-13A thru 406-13D (rev.), 406-14A thru 406- 14Z (deleted, content revised and consolidated into new figures 406-14AA thru 406-14EE) | Stage 3 submittals on or after January 1st, 2023 |
| 22-18 | 09/13/22 | Chemical Anchors for Post-Installed Reinforcement | IDM Chapter 412, 412-3.01(08), 412-3.03(02), and Figure 412-3B (del.) | Immediately |
| 22-17 | 09/13/22 | AASHTO LRFD Bridge Design Specifications | N/A | Stage 2 submittals on or after March 1, 2023 |
| 22-16 | 08/04/22 | Intelligent Transportation Systems (ITS) Update | IDM Chapter 502, Section 502-5.0, Figures 502-5A thru 502-5F deleted | Stage 3 submittals on or after September 1st, 2022 |
| 22-15 | 07/26/22 | INDOT 2022 Standard Drawings | N/A | Lettings on or after September 1, 2022 |
| 22-14 Rev. | 07/15/22 rev. 09/09/22 | Liquid Asphalt Sealant for Milled HMA Corrugations | N/A | Contract Lettings on or after November 1, 2022 |
| 22-13 | 07/07/22 | Working Drawings for Precast 3-sided Structures and Box Culverts | N/A | Lettings on or after August 1, 2022 |
| 22-12 | 07/07/22 | Subgrade Treatment for Full Depth Patching | IDM Chapter 603 Sections 603-3.01 and 603-3.04 | Contract Lettings on or after November 1, 2022 |
| 22-11 | 07/07/22 | Pre-Bid Meeting Information | N/A | Lettings on or after October 1, 2022 |
| 22-10 | 07/07/22 | INDOT Lighting Policy | IDM Chapter 502 Sections 502-4.01(03),502-4.01(04) and 502-4.02,502-4.02(01) thru 502-4.02(14) (deleted) | Stage 1 Plan Submittals on or after July 1, 2022 |
| 22-09 | 06/06/22 | Revisions to Reinforced-Concrete Structure | IDM Chapter 405, 405-1.02 thru 405-1.07, 405-2.0 thru 405-2.05, 405-2.06(01), 405-2.06(03), 405-2.07(01) thru 405-2.07(04), 405-2.08 thru 405-2.10, 405-2.11 thru 405-2.13, 405-3.0 thru 405-3.01(05), and 405-3.02 thru 405-3.14, Figures 405-1A , and Figure 405-2C (revised), and | Immediately |
| 22-08 | 04/20/22 | Revisions to Hydraulics Submittal Process and Editable Documents | IDM Chapter 203 Section 203-2.04(04) and 203-3.06, Figures 203-2L and 203-3C (deleted) | Immediately |
| 22-07 | 04/20/22 | Revisions to Letting Preparation Schedule | N/A | Lettings on or after December 7, 2022 |
| 22-06 | 04/20/22 | Revisions to Maintenance of Traffic Standards | N/A | Lettings on or after September 1, 2022 |
| 22-05 | 04/20/22 | Concrete Median Barrier for Interstate Routes | N/A | Immediately |
| 22-04 | 02/09/22 | Payment Revisions of Construction-Zone Energy-Absorbing Terminals and Temporary Traffic Barriers | IDM Chapter 17, Section 17-4.13 | Lettings on or after June 1, 2022 |
| 22-03 | 01/21/22 | Pavement Design for Small Structure and Bridge Projects | IDM Chapter 601, Sections 601-5.03 (new), 601-6.0, IDM Chapter 605, Sections 605-1.09 thru 605-1.13 (deleted), Figure 601-5C (new), and 17-5.09(01) | Lettings on or after July 1, 2022 |
| 22-02 | 01/21/22 | Life-Cycle Pavment Cost Analysis (LCPCA) Update | IDM Chapter 601, Section 601-5.01(04), IDM Chapter 606, Sections 606-1.0, 606-2.02, 606-2.04, 606-2.06, 606-3.01, and 606-3.02 | Lettings on or after May 1, 2022 |
| 22-01 | 01/06/22 | Stage 2 Documents for Publication | IDM Chapter 14, Sections 14-2.01(07), 14-2.04(06), 14-2.05(03), 14-2.06(02), 14-2.07(02), and 14-2.08(02) | Stage 2 Plans on or after January 06, 2022 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 21-25 | 12/30/21 | Mechanically Stabilized Earth (MSE) Walls | IDM Chapter 14, Sections 14-2.01(07), 14-2.01(12), 14-2.04(06), 14-2.04(09), 14-2.05(05)IDM Chapter 17, Figure 17-5CIDM Chapter 402, Section 402-6.02(02)IDM Chapter 409, Figure 409-2GIDM Chapter 410, Section 410-5.01(06) and Figure 410-5(O)CEditable Document: MSE Wall Design Review Checklist | Lettings on or after December 30,2021 |
| 21-24 | 12/09/21 | Pavement Markings | IDM Chapter 502, Sections 502-2.01(03) New, 502-2.01(04) thru 502-2.01(08), 502-2.02(01) thru 502-2.02(04), 502-2.02(06) thru 502-2.02(07), 502-2.02(12), 502-2.02(16), 502-2.02(17), 502-2.02(21), 502-2.06(04), 502-2.06(05), 502-2.09(02), 502-2.09(03), 502-2.10, and 502-2.11, Figures 502-2A, 502-2B, 502-2C, 502-2D, and 502-2Q | Lettings on or after July 1, 2022 |
| 21-23 | 09/28/21 | Letting Preparation Schedule | N/A | Lettings on or after December 7,2022 |
| 21-22 | 09/14/21 | Pay Item Revision of Geotextile for Subgrade | N/A | Lettings on or after March 9, 2022 |
| 21-21 | 11/02/21 | Bridge Preventive Maintenance Criteria | Figure 412-1A | Start Plan Development Date on or after November 2, 2021 |
| 21-20 | 09/09/21 | Spray Paver Use with HMA/SMA | IDM Chapter 17, Sections 17-4.01(01), and Figure 17-4A, and IDM Chapter 607, Sections 607-1.04 and 607-1.05 | Lettings on or after September 1, 2022 |
| 21-19 | 09/09/21 | Historic Bridge Review Submittals | IDM Chapter 14, Sections 14-2.01(09), 14-2.05, 14-2.05(03) thru 14-2.05(07), and IDM Chapter 412, Sections 412-5.01(02) and 412-5.02 | Immediately |
| 21-18 Rev. | 09/09/21 rev. 02/09/22 | Scour Requirements for Bridge Preventive Maintenance Projects | IDM Chapter 14, Sections 14-2.05, 412-2.0, and Figure 412-2C(Rev.) | Stage 1 Submittals on or after October 1, 2021 |
| 21-17 | 06/17/21 | Indiana Design Manual Updates for Unique Special Provisions | IDM Chapter 14, Sections 14-1.02, 14-2.01, 14-2.03 thru 14-2.08, Figure 14-1K(Rev.), and Figure 14-1L(Del.) IDM Chapter 19, Section 19-2.01, 19-2.03, 19-3.02, 19-3.02(01) thru 19-3.02(04), and Figure 19-3D(Rev.) | Immediately |
| 21-15 | 04/12/21 | INDOT 2021 Standard Drawings | N/A | Lettings on or after September 1, 2021 |
| 21-10 | 04/12/21 | Zipper Merges for Transportation Operations Plans | IDM Chapter 503, Section 503-4.02 | Lettings on or after September 1, 2021 |
| 21-09 | 04/12/21 | Cement Stabilized Subgrade Soils | IDM Chapter 17, Section 17-4.02(02) thru 17-4.02 (04) | Lettings on or after June 1, 2021 |
| 21-08 Rev. | 03/11/21 rev. 10/25/21 | Indiana Design Manual Chapter 14 Updates: Addition of TMP Submittal Items for Significant Projects and MOT Submittal Changes | IDM Chapter 14 and Editable Document 103-02-02 | Stage 1 Submittal Date on or after August 1, 2021 |
| 21-05 | 03/11/21 | Traffic Management for Design Projects | N/A | Stage 1 Submittals on or after August 1, 2021 |
| 21-04 | 03/11/21 | Full Depth Reclamation (FDR) Projects and Rule 5 Permits | N/A | Immediately |
| 21-03 | 03/11/21 | Indiana Design Manual Chapters 104 & 105 Rewrite | Indiana Design Manual Chapter 104, Utility Coordination & Chapter 105 Railroad Coordination, Figure 105-1A (deleted) | Immediately |
| 21-01 | 01/07/21 | Longitudinal Joint Options and D-1 Contraction Joint Spacing | Figure 602-3Z | Lettings on or after June 1, 2021 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 20-16 | 09/10/20 | Proprietary Materials | 17-1.05(01), 17-1.05(02), and Editable Documents in Proprietary Material Category | As noted |
| 20-15 | 09/10/20 | Pavement Project Categories | 602-1.0, 602-1.03(08), 602-1.04(02), 602-1.04(08), 602-1.04(09), Figures 602-1B and 602-1C | Immediately |
| 20-14 | 08/06/20 | Preventative Maintenance and 3R Design Criteria for Freeway and Interstate Resurfacing Projects Attachment: August 2020 Q&A for Design Memos 20-13 & 20-14 | N/A | Immediately |
| 20-13 | 08/06/20 rev. 10/08/20 | Level One Controlling Criteria Attachment: August 2020 Q&A for Design Memos 20-13 & 20-14 | N/A | Immediately |
| 20-12 | 08/06/20 | Truck Mounted Attenuators | 503-3.05(04) | Lettings on or after December 1, 2020 |
| 20-09 | 05/18/20 | INDOT 2020 Standard Drawings | N/A | Lettings on or after September 1, 2020 |
| 20-05 Rev. | 04/13/20 rev. 04/16/20 | Stormwater Management | 14-2.01(07), 14-2.03(03), 14-2.04(06), and 14-2.05(03) | As Noted |
| 20-04 | 04/13/20 | Subgrade Treatment | 17-4.02 | Lettings on or after September 1, 2020 |
| 20-03 Rev. | 04/13/20 rev. 07/06/20 | Bridge Painting | 17-5.11, 412-3.03(06), Figures 17-5K and 17-5L | Lettings on or after June 1, 2020 rev. Stage 3 Submittal on or after July 6, 2020 |
| 20-02 | 01/07/20 | Ramp Maximum Grade | 48-5.04(01) | Stage 3 submittal on or after January 7, 2020 |
| 20-01 | 01/07/20 | Pavement Design -Indiana Design Manual reorganization | Chapter 304 | Pavement Design Approval on or after January 7, 2020 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 19-11 | 10/10/19 | Proprietary Materials | N/A | N/A |
| 19-10 | 09/05/19 | Terminal Joints | 17-5.09(01), 402-7.02(03), and 409-2.04 | Lettings on or after March 1, 2020 |
| 19-08 Rev. | 09/05/19 rev. 10/23/19 | Bridge Railing | 404-4.0 | Stage 3 Submittal on or after September 5, 2019 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 18-26 | 11/08/18 | Pedestrian Pushbutton and ADA Plan Details | 51-1.06(03) | Stage 3 Submittal on or after March 1, 2019 |
| 18-21 | 08/06/18 | Bundling HMA Quantities | N/A | Lettings on or after December 1, 2018 |
| 18-20 | 08/06/18 | Bridge Aesthetics Policy | N/A | Immediately |
| 18-17 Rev. | 08/06/18 rev. 08/08/18 rev. 05/06/19 | Bridge Deck Overlays | N/A | Lettings on or after September 1, 2019 |
| 18-14 | 08/06/18 | Hydraulic Memo Templates | N/A | Hydraulic Submittals on or after August 1, 2018 |
| 18-12 | 06/04/18 | Office of Hydraulics Review for LPA Projects | N/A | Lettings on or after July 1, 2018 |
| 18-11 | 05/09/18 | Pedestrian Crossing Treatment RRFB | Figure 51-7 O | Immediately |
| 18-08 rev. | 05/09/18 rev. 05/16/18 | Geotechnical Waivers and Investigations for LPA Projects | N/A | Immediately |
| 18-06 | 03/05/18 | Development of FDR Pavement Projects as Partial 3R | 304-6.01 thru 304-6.03 | Immediately |
| 18-05 | 03/05/18 | Plan Note for TAC Approved ADA Inquiries | N/A | Stage 3 Submissions on or after April 2, 2018 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 17-28 | 12/04/17 | Plant Growth Layer | N/A | Lettings on or after March 1, 2018 |
| 17-27 | 12/04/17 | Bridge-Length Culverts | N/A | Immediately |
| 17-23 rev. | 10/02/17 rev. 02/05/18 | AASHTO LRFD Bridge Design Specifications | N/A | Stage 2 Submission on or after August 1, 2018 |
| 17-20 | 09/05/17 | Complex Bridge Design Requirements | N/A | Immediately |
| 17-19 | 09/05/17 | Next Level Signs Attachment: Signs | N/A | Select Projects with Lettings on or after January 1, 2018 |
| 17-18 | 08/07/17 | Use of Geotextile in Geotechnical Applications | N/A | Lettings on or after |
| 17-17 | 08/07/17 | Manual for Assessing Safety Hardware (MASH) and New W-beam Guardrail and Guardrail End Treatment Standards Attachment: Pay Items Associated with MGS W-Beam Guardrail and Related Systems | N/A | NHS Routes: Letting on or after January 1, 2018 Non-NHS Routes: Letting on or after July 1, 2018 |
| 17-16 | 08/07/17 | Permanent Metal Forms Attachment: Sections 404-2.02(02), 404-2.02(03), 404-2.03(02), Figures 404-2B and 404-2C | 404-2.02, 404-2.03, Fig. 404-2B and 404-2C | Lettings on or after |
| 17-10 | 05/11/17 | Manual for Assessing Safety Hardware (MASH) and New W-beam Guardrail and Guardrail End Treatment Standards Attachment: Midwest Guardrail System Assembly Figures, AASHTO/FHWA Joint Implementation Agreegement for MASH Memo | N/A | NHS Routes: Letting on or after January 1, 2018 |
| 17-04 | 03/16/17 | Culvert Asset ID Number Attachment: Culvert Asset ID Numbering System | N/A | Stage 3 on or after May 2017 |
| 17-02 | 02/02/17 | Rural Interstate Shoulder Width | N/A | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 16-35 | 11/21/16 | Undistributed Quantities | N/A | Immediately |
| 16-16 | 04/11/16 | Quantities Attachments: Section 17-1.05, Section 17-4.06, Sections 17-4.09 thru 17-4.10(03), Section 17-5.09, Section 17-6.0, Figures 17-5G thru -5G(02), 17-4D, 17-5I, 17-5J | As Noted | Sections 17-1.05, 17-4.06, 17-4.09 thru 17-4.10(03), 17-5.09, 17-6.0, Figures 17-5G thru -5G(02), 17-4D, 17-5I, 17-5J |
| 16-10 | 03/16/16 | NEPA Compliance and Waterway Permitting for Bundled Projects Attachment: INDOT Environmental Memo | N/A | Immediately |
| 16-01 | 01/05/16 | Structure Number in ERMS, SPMS, and on Plans Attachment: Example | N/A | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 15-11 | 05/01/15 | Anchored Temporary Concrete Barrier | N/A | Letting on or after May 1, 2015 |
| 15-08 | 04/07/15 | Title Sheet Signatures for Local Public Agency (LPA) Projects | N/A | Letting on or after August 5, 2015 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 14-10 | 07/01/14 | Practical Design | 40-8.01, 40-8.04(01), Chapter 53, 55-3.0, 55-4.01(03), Figures 40-8B, 53-1 through 53-9, 55-3A through 55-3H | Immediately |
| 14-05 | 04/02/14 | Policy and Procedure for Determination of Technical Infeasibility Attachment: Policy and Procedure for Determination of Technical Infeasibility | N/A | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 13-10 | 04/15/13 | Roundabouts Attachment: Roundabout Design Checklist | 51-12.0 | Immediately |
| 13-09 | 04/12/13 | Small Structure Replacement, Guardrail Runout Length Attachment: RDG Table 5-10(b) | Chapters 49 & 55 | Preliminary Field Check on or after June 1, 2013 and as noted |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 12-21 | 10/05/12 | Use of AASHTO LRFD Bridge Design Specifications | 409-9.0 | Stage 2 Submission on or after 12/21/12 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 11-12 | 07/08/11 | Metric-Units Plans | See Memo | Immediately |
| 11-09 | 04/05/11 | High-Tension Cable-Barrier System (CBS) Attachment: RSP 627-R-546 Attachment: RPD 627-R-546d | 49-5.01(04) | Lettings on or after May 11, 2011 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 05-34 | 11/9/05 | Concrete Railings & Moment Slabs at Mechanically Stabilized Earth (MSE) Wall Systems Attachment: 706-R-504 RSP & RPD | 49-4.01(05) | 02/15/10 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 03-07 | 07/02/03 | Policy for Context Sensitive Solution | N/A | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Effective Date |
| 01-14 | 12/10/01 | Water Main & Sanitary Sewer Construction in Contracts | N/A | Immediately |
