Design memos are listed by topic and open in PDF. Signed originals are filed in the Helena Construction and/or Design Office.

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Category Title/Subject Released
Miscellaneous Construction Modeling Deliverables 12/19/2023
Hydraulics Hydraulics / Road Design 2023 Manual Updates 12/11/2023
Road Design Hydraulics / Road Design 2023 Manual Updates 12/11/2023
Miscellaneous Plan-in-hand and Final Plan Review Reports 09/05/2023
Bridge Rescind the use of Polymer Overlay’s on Bridge Decks 08/28/2023
Curbs, Ramps, & Sidewalk Sidewalk & Approach Construction Agreement | Procedure 07/20/2023
Plans Preparation Project Limits on Plans 07/19/2023
Miscellaneous Alternative Contracting Projects Decision Process 05/10/2023
Signing & Pavement Markings Guidance on Signs, Sign Sheeting, Pavement Markings, and Delineation on Department Responsible Roadways 04/03/2023
Rumble Strips Centerline Rumble Strip Guidance 11/04/2022
Roadside Barrier MASH Box Beam Terminal-MBEAT and MASH Box Beam Updates 09/14/2022
Plans Preparation Quantity Splits 06/27/2022
Hydraulics Hydraulics Manual Update 01/28/2022
Plans Preparation Special Provision Process Improvement 10/04/2021
Roadside Barrier Concrete Barrier Compliance (Revised) 06/16/2021
Bridge Bridge Design 3D Modeling 5/21/2021
Miscellaneous MDT Geometric Design Criteria and Design Exceptions 03/25/2021
Bridge Bridge Width Standards and Guidelines 10/07/2020
Miscellaneous Finished Grade Control and Bridge Survey 09/17/2020
Miscellaneous Service Connections Utility Coordination Procedure Guidelines 08/17/2020
Traffic Control Interstate Median Crossover Guidance 03/04/2020
Plans Preparation Storm Drain Bid Item Changes 02/13/2020
Bridge MASH Bridge Rail Implementation Guidance 01/23/2020
Miscellaneous Proprietary Products 11/01/2019
Signing & Pavement Markings Guidance for Determining Pedestrian Crossing Treatment at Uncontrolled Locations 11/01/2019
Surfacing & Typical Sections New Plant Mix Items for Miscellaneous Paving 06/26/2019
Signing & Pavement Markings Centerline Pavement Markings for Rural Highways 06/18/2019
Roadside Barrier Temporary Impact Attenuators - Guidance for Inclusion as a Contract Bid Item 05/16/2019
Miscellaneous Project Linear Referencing 11/30/2018
Surfacing & Typical Sections Placing Topsoil on the Surfacing Inslope 09/28/2018
Miscellaneous Roadway Width and Rumble Strip Committee 09/26/2018
Miscellaneous Roundabout Landscape Committee 04/27/2018
Roadside Barrier MASH Guardrail Implementation Guidance 02/08/2018
Surfacing & Typical Sections Pavement Design Manual Implementation 11/16/2017
Erosion Control & Environmental Wetland Coordinates 11/15/2017
Miscellaneous Shared-use Paths 09/14/2017
Bridge Minimum Bridge Deck Thickness 02/06/2017
Bridge Bridge Plan Drawing Numbers, Q Sheet 12/30/2016
Surfacing Guidance on the Selection of Crushed Cover Aggregate – Cover Material 12/21/2016
Erosion Control & Environmental Temporary Erosion Control 10/12/2016
Plans Preparation Road Plan and Cross Section PDF With Authorized R/W Lines 09/29/2016
Surfacing 1/2 inch Plant Mix Surfacing 08/31/2015
Rumble Strips Rumble Strip Guidance 07/08/2015
Bridge Concrete Deck, Assumed Sacrificial Wearing Surface and Concrete Strength 06/10/2015
Bridge LRFD Bridge Deck Design 06/09/2015
Surfacing & Typical Sections 30-year Pavement Design at Bridge Ends 04/29/2015
Grading Obliterate Roadway – Re-establishment of Vegetation 12/15/2014
Miscellaneous Manhole and Water Valve Adjustments 10/29/2014
Grading Obliterate Roadway – Use/Disposal of Existing Plant Mix 10/16/2014
Fencing & Right of Way Right of Entry Procedure | Right of Entry Form Template 04/25/2014
Grading Obliterate Roadway 03/19/2014
Surfacing & Typical Sections Chip Seal Guidelines 12/06/2013
Roadside Barrier Guardrail Post Information 10/21/2013
Bridge Safe Posting Load, Railroad Car Bridges 02/08/2013
Signing & Pavement Markings Advance Warning Flashers at Signalized Intersections 01/18/2013
Signing & Pavement Markings Horizontal Alignment Sign Selection 01/11/2013
Signing & Pavement Markings Use of Vehicle Speed Feedback Signs (VSFS) on the State Maintained System - VSFS Guidelines 09/12/2012
Surfacing & Typical Sections 30-year Pavement Design at Bridge Ends
(See Supplemental 4/29/2015)
Traffic Control Guidelines - Interstate Median Crossovers 02/28/2012
Curbs, Ramps, & Sidewalk ADA Curb Ramp Design Requirements 02/10/2012
Surfacing & Typical Sections PTW Surfacing/Subgrade Treatment 10/28/2011
Roadside Barrier W-Beam Guardrail Height 10/04/2011
Grading Mass Diagram in Blue Sheet Plans 06/30/2011
Fencing & Right of Way Wildlife Friendly Fence Details 12/30/2010
Curbs, Ramps, & Sidewalk Public Rights-of-Way Accessibility Guidelines (PROWAG) 11/19/2010
Signing & Pavement Markings Policy on Sign Sheeting Materials for Permanent Signs 09/29/2010
Surfacing & Typical Sections PTW Surfacing/Subgrade Treatment
(see update 10/28/2011)
Roadside Barrier W-Beam Guardrail Height
(see update 10/04/2011)
Grading Shrink/Swell Factors in Grading Frames 03/24/2010
Roadside Barrier Guardrail End Section Widening - Modification 02/10/2010
Grading Balanced Earthwork 01/13/2010
Miscellaneous Type B Scale Sites 09/14/2009
Surfacing & Typical Sections Recycled Surfacing Options 03/16/2009
Surfacing & Typical Sections Use of Cold Millings in Federal-Aid Projects 03/10/2009
Grading Mass Diagram and Grading Frames 08/19/2008
Grading Mass Diagrams
(see supplemental 08/19/08 and update 06/30/11)
Curbs, Ramps, & Sidewalk Curb Dimensions 04/30/2008
Miscellaneous Specialty Items 04/25/2008
Fencing & Right of Way Wildlife Fence Issues 04/06/2007
Surfacing & Typical Sections Isolation Lifts 12/14/2005
Fencing & Right of Way Retracement Surveys - a guideline for RW Plans 08/11/2005
Fencing & Right of Way Access to Bridges 02/14/2005
Bridge Salvaged Bridge Material 09/30/2003
Bridge Vertical Clearance Railroad Separations 06/19/2003
Bridge Structure Excavation on End Bents as a Pay Item 10/03/2000