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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 Superseded memos are archived immediately.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: 10/04/21 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 21-21 | 09/14/21 | Condition-Driven Preventative Maintenance Eligibility Criteria Update | IDM Chapter 412, Figure 412-1A | October 4, 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 9/1/2022 | |
| 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 | 09/09/21 | 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 | |
| 21-16 | 06/17/21 | Prestressed-Concrete Structure | IDM Chapter 406, Sections 406-4.02, 406-4.02(01), 406-5.02, 406-5.05, 406-6.0, 406-7.0, 406-7.01 thru 406-7.04, 406-8.01, 406-8.02, 406-9.01 thru 406-9.03, 406-10.0, 406-11.0, 406-12.01, 406-12.03(02), 406-12.03(03), 406-12.05, and 406-12.06 | Immediately | |
| 21-15 | 04/12/21 | INDOT 2021 Standard Drawings | Lettings on or after September 1, 2021 | ||
| 21-14 | 04/12/21 | Preformed Expansion Joint Filler | IDM Chapter 406, Figures 416-16A, 406-16B, 406-16H, 406-16 I, 406-16 O, 406-16P, and 406-16R
IDM Chapter 409, Section 409-7.06 & Figures 409-2B, 409-2C, 409-2D, 409-2G, 409-3A, 409-3B, and 409-3D IDM Chapter 410, Section 410-5.01(07) |
Lettings on or after September 1, 2021 | |
| 21-13 | 04/12/21 | Pre-Compressed Foam Joint | IDM Chapter 404, Section 404-2.06(03) & Figure 404-2J(new) | Immediately | |
| 21-12 | 04/12/21 | Surface Seal | IDM Chapter 17, Section 17-5.01(03)
IDM Chapter 404, Section 404-2.01 |
Lettings on or after August 11, 2021 | |
| 21-11 | 04/12/21 | Reinforced Concrete Pile Encasement | IDM Chapter 17, Section 17-5.03(02) | 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 | 03/11/21 | 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 | |
| 21-07 | 03/11/21 | Indiana Design Manual Chapter 14 Updates: Traffic Submittal Updates | IDM Chapter 14, 14-1.02(09) (new), 14-2.06, 14-2.07, and 14-2.08, and Editable Document 103-02-02 | Immediately | |
| 21-06 | 03/11/21 | Indiana Design Manual Chapters 14 and 412 Updates: Bridge Preservation and Bridge Naming Conventions | IDM Chapter 14, Sections 14-2.04 thru 14-2.05 IDM Chapter 412, Sections 412-1.0 thru 412-1.02(02), 412-2.0 thru 412-2.02, 412-2.02(02), 412-2.03(02), 412-3.01(03) thru 412-3.01(05), 412-3.02(04), 412-3.02(06), 412-3.03(08), 412-3.05(07), Figures 412-1A & 412-1B and Editable Documents 103-02-02, 412-02-01, and 412-02-02 | Immediately | |
| 21-05 | 03/11/21 | Traffic Management for Design Projects | Stage 1 Submittals on or after August 1, 2021 | ||
| 21-04 | 03/11/21 | Full Depth Reclamation (FDR) Projects and Rule 5 Permits | 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 | |
| 21-02 | 02/04/21 | Mechanically Stabailized Earth (MSE) Walls | 14-2.01(04), 14-2.01(12), 14-2.02(03),14-2.04(03), 14-2.04(09), 14-2.05(03), 14-2.05(04), 410-2.03(01), 410-2.03(03), 410-5.01(05), 410-5.01(06), 410-5.01(07), 410-5.02(01), 410-5.03, 410-6.05(01), 410-6.07(01), 410-6.07(03), 410-7.01(01), 410-7.01(02), 410-7.02(03), 410-7.04(01), 410-7.05(01), Figs. 410-5(0)A thru C, MSE Wall Design Review Checklist (new) | As noted. | |
| 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 | Attachments | Effective Date |
| 20-24 | 11/05/20 | Temporary Pavement Markings | 503-7.03 and 503-7.03(01) | Lettings on or after March 1, 2021 | |
| 20-23 | 10/08/20 | Field Office Type and Telephone Service | 20-2.03 and Editable Document 14-1C | Contracts letting on or after March 10, 2021 | |
| 20-22 | 10/08/20 | Mass Concrete | 405-1.08 and Figure 405-1D | Stage 3 Submittal on or after October 8, 2020 | |
| 20-20 | 10/08/20 | Accessible Pedestrian Signal (APS) Studies, Pedestrian Push Buttons, and Curb Ramps | 51-1.06(01), 51-1.06(02), 51-1.06(03), 502-3.03(05), and 502-3.04(05) | Projects Letting on or after March 10, 2021 | |
| 20-19 | 09/10/20 | Deleted Figure Placeholder Removal & Editable Documents Naming Conventions | None | Immediately | |
| 20-18 Rev. | 09/10/20 rev. 01/07/2021 | Shop Drawing and Falsework Review Procedure | 14-1.02(08) | Immediately, MSE Wall Shop Drawing Review Checklist required for shop drawings submitted for review on or after May 1, 2021 | |
| 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 | None | Immediately | |
| 20-13 | 08/06/20 rev. 10/08/20 | Level One Controlling Criteria | None | Immediately | |
| 20-12 | 08/06/20 | Truck Mounted Attenuators | 503-3.05(04) | Lettings on or after December 1, 2020 | |
| 20-11 | 08/06/20 | Elastomeric Bearing Pads | 409-7.03(03), 409-7.04, 409-7.05, Figures 409-7F, 409-7J, 409-7K(deleted), 409-7L, and 409-7M | Stage 3 Submittal on or after August 6, 2020 | |
| 20-10 | 07/06/20 | Seed Mix & Mulching Updates | 17-4.10, 17-4.10(01) thru 17-4.10(04), and 17-4.10(06) thru 17-4.10(08) | Immediately | |
| 20-09 | 05/18/20 | INDOT 2020 Standard Drawings | None | Lettings on or after September 1, 2020 | |
| 20-08 | 05/07/20 | End Bent and Pier Diaphragm Details | Figures 406-16A, 406-16B, 406-16D thru 406-16 I, 406-16K thru 406-16N, 409-2C, 409-2D, 409-3A, and 409-3B | Stage 3 Submittal on or after June 1, 2020 | |
| 20-07 | 05/07/20 | Bulb-Tee Beam Details | Figures 406-14A thru 406-14Z | Stage 3 Submittal on or after June 1, 2020 | |
| 20-06 | 05/07/20 | Bridge Load Rating Requests | 14-2.04(09), 14-2.05, and 14-2.05(04) | Immediately | |
| 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 | Attachments | Effective Date |
| 19-12 | 10/10/19 | Chapter 503 Maintenance of Traffic | Chapter 81, 82, and 83 | See Memo | |
| 19-11 | 10/10/19 | Proprietary Materials | None | 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 | Attachments | 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 | |
| 18-25 | 11/08/18 | Engineering Assessment Manual | None | As noted | |
| 18-21 | 08/06/18 | Bundling HMA Quantities | None | Lettings on or after December 1, 2018 |
|
| 18-20 | 08/06/18 | Bridge Aesthetics Policy | None | Immediately | |
| 18-17 Rev. | 08/06/18 rev. 08/08/18 rev. 05/06/19 | Bridge Deck Overlays | None | Lettings on or after September 1, 2019 |
|
| 18-14 | 08/06/18 | Hydraulic Memo Templates | None |
Hydraulic Submittals on or after August 1, 2018 |
|
| 18-12 | 06/04/18 | Office of Hydraulics Review for LPA Projects | None | Lettings on or after July 1, 2018 |
|
| 18-11 | 05/09/18 | Pedestrian Crossing Treatment RRFB | Figure 51-7 O | Immediately | |
| 18-10 | 05/09/18 | Covering Conflicting Pavement Markings | 83-4.01(03) | Lettings on or after December 1, 2018 |
|
| 18-08 rev. | 05/09/18 rev. 05/16/18 | Geotechnical Waivers and Investigations for LPA Projects | None | 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 | None | Stage 3 Submissions on or after April 2, 2018 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 17-28 | 12/04/17 | Plant Growth Layer | None | Lettings on or after March 1, 2018 |
|
| 17-27 | 12/04/17 | Bridge-Length Culverts | None | Immediately | |
| 17-23 rev. | 10/02/17 rev. 02/05/18 | AASHTO LRFD Bridge Design Specifications | None |
Stage 2 Submission on or after August 1, 2018 |
|
| 17-20 | 09/05/17 | Complex Bridge Design Requirements | None |
Immediately |
|
| 17-19 | 09/05/17 | Next Level Signs | None |
Signs | Select Projects with Lettings on or after January 1, 2018 |
| 17-18 | 08/07/17 | Use of Geotextile in Geotechnical Applications | None |
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 |
None |
Pay Items Associated with MGS W-Beam Guardrail and Related Systems | 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 | 404-2.02, 404-2.03, Fig. 404-2B and 404-2C |
Sections 404-2.02(02), 404-2.02(03), 404-2.03(02), Figures 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 | None |
Midwest Guardrail System Assembly Figures, AASHTO/FHWA Joint Implementation Agreegement for MASH Memo | NHS Routes: Letting on or after January 1, 2018 |
| 17-04 | 03/16/17 | Culvert Asset ID Number | None |
Culvert Asset ID Numbering System | Stage 3 on or after May 2017 |
| 17-02 | 02/02/17 | Rural Interstate Shoulder Width | None |
Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 16-35 | 11/21/16 | Undistributed Quantities | None |
Immediately | |
| 16-16 | 04/11/16 | Quantities | 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 |
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 |
| 16-10 | 03/16/16 | NEPA Compliance and Waterway Permitting for Bundled Projects | None | Immediately | |
| 16-06 | 03/08/16 | Portable Signals | 83-5.0 | Letting on or after September 1, 2016 | |
| 16-01 | 01/05/16 | Structure Number in ERMS, SPMS, and on Plans | None | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 15-11 | 05/01/15 | Anchored Temporary Concrete Barrier | None | Letting on or after May 1, 2015 | |
| 15-08 | 04/07/15 | Title Sheet Signatures for Local Public Agency (LPA) Projects | None | Letting on or after August 5, 2015 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | 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 | None | Policy and Procedure for Determination of Technical Infeasibility | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 13-10 | 04/15/13 | Roundabouts | 51-12.0 | Roundabout Design Checklist | Immediately |
| 13-09 | 04/12/13 | Small Structure Replacement, Guardrail Runout Length | Chapters 49 & 55 | RDG Table 5-10(b) | Preliminary Field Check on or after June 1, 2013 and as noted |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | 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 | Attachments | Effective Date |
| 11-12 | 07/08/11 | Metric-Units Plans | See Memo | Immediately | |
| 11-09 | 04/05/11 | High-Tension Cable-Barrier System (CBS) | 49-5.01(04) | RSP 627-R-546 RPD 627-R-546d |
Lettings on or after May 11, 2011 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 05-34 | 11/9/05 | Concrete Railings & Moment Slabs at Mechanically Stabilized Earth (MSE) Wall Systems | 49-4.01(05) | 706-R-504 RSP & RPD | 02/15/10 |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 03-07 | 07/02/03 | Policy for Context Sensitive Solution | Unknown | Immediately |
| Memo Number | Memo Date | Subject | Affected IDM Section | Attachments | Effective Date |
| 01-14 | 12/10/01 | Water Main & Sanitary Sewer Construction in Contracts | Unknown | Immediately |