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Active Design Memos

Active Design Memos

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 integral to applying a recurring special provision (RSP) or recurring plan detail (RPD) may remain on this page longer. Superseded memos are archived immediately.

The practice of distinguishing policy memos from techncial advisories was discontinued January 2018.

This Page Last Updated 02/12/2024

Memo Number Memo Date Subject Affected IDM Section Effective Date
24-03 02/12/24 Waterproofing Membrane and Partial Coating Limits IDM Sections 407-2.01(03), Figure 407-2A (deleted) Contracts Letting on or after September 1, 2024
24-02 01/09/24 Lightweight Concrete, Threaded Tie Bar Assemblies, and Concrete Cover IDM Sections 405-2.07(06) (new), 405-3.13 (deleted), and Figures 405-1A, 405-2C, 405-2AA, 405-3E As Noted
24-01 01/09/24 Subgrade Treatment IDM Chapter 603-4.0 Lettings on or after June 1, 2024
Memo Number Memo Date Subject Affected IDM Section Effective Date
23-21 12/08/23 HMA Pavement PG Binder IDM Chapter 601-2.0, 601-3.0, 601-5.01(04), and Fig. 601-5C
IDM Chapter 602-3.02, 602-3.02(01) thru -3.02(03)
IDM Chapter 607-1.0, 607-1.01
Lettings on or after September 1, 2024
23-20 11/15/23 Extended Pile Bents and Wall Pier on Single Row of Piles IDM Chapter 409-6.01(01), 409-6.03(05), 409-6.04(01), 409-6.04(02), 409-6.04(04), Figures 409-6B and 409-6C Stage 1 submittals on or after January 1, 2024
23-19 11/15/23 Joint Probability Analysis IDM Figure 203-2G Hydraulic Design submitted or completed on or after November 15, 2023
23-18 11/15/23 Survey Transmittal Updates IDM chapter 26 Design Survey on or after November 15, 2023
23-17 10/16/23 Placing and Terminating Temporary Traffic Barrier N/A Lettings on or after December 1, 2023
23-16 10/16/23 Public Rights-of-Way Accessibility Guidelines (PROWAG) N/A Lettings on or after July 1, 2024
23-15 10/16/23 Build America, Buy America IDM Chapter 104-2.02 Immediately
23-14 10/16/23 Foundation Review Procedure IDM Chapter 408-1.06(02), Figure 408-3A, 408-3B and Figure 408-1B(deleted), Editable Document 408-1B-LRFD and 408-1C-LRFD(new) Stage 3 Submittals on or after January 1, 2024
23-13 09/14/23 Hydraulic Reviews and Replacement-In-Kind IDM Chapter 201-1.02, 203-2.02, and 203-2.08 [new] Immediately
23-12 09/14/23 Design Exceptions IDM Chapter 14-2.01(03), Chapter 40-6.01(08),40-8.02, and 40-8.03 Immediately
23-11 09/14/23 Payment for Elastomeric Bearing Assemblies IDM Chapter 409-7.03(01) Lettings on or after June 1, 2024
23-10 08/14/23 Bridge Painting IDM Chapter 17-5.11 As Noted
23-09 07/19/23 2023 INDOT Standard Drawings N/A Lettings on or after September 1, 2023
23-08 07/11/23 Railroad Flagging IDM Chapter 105-3.03 Contracts letting on or after January 1, 2024
23-07 07/11/23 Guardrail End Treatments N/A Lettings on or after October 1, 2023
23-06 06/19/23 Cross Slope Correction 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)
Affected MOT Editable Documents
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
22-17 09/13/22 AASHTO LRFD Bridge Design Specifications N/A Stage 2 submittals on or after March 1, 2023
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
22-05 04/20/22 Concrete Median Barrier for Interstate Routes N/A Immediately
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
21-18 Rev. 09/09/21 rev. 02/09/22 rev. 07/11/2023 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
21-04 03/11/21 Full Depth Reclamation (FDR) Projects and Rule 5 Permits N/A Immediately
Memo Number Memo Date Subject Affected IDM Section Effective Date
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
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
18-05 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
17-27 12/04/17 Bridge-Length Culverts N/A Immediately
17-20 09/05/17 Complex Bridge Design Requirements N/A

Immediately

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
17-10 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
Non-NHS Routes: Letting on or after July 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
16-10 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
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
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

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