Design memos are listed by topic and open in PDF. Signed originals are filed in the Helena Construction and/or Design Office.
Tip: Click column heading to sort.
| Category | Title/Subject | Released |
|---|---|---|
| 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 |
| Signing And Pavement Markings | Type XI Sign Sheeting – Updated Application Guidelines | 01/11/2022 |
| 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 |
| Miscellaneous | Bid Item Changes | 10/18/2019 |
| Signing & Pavement Markings | Pavement Marking Quantities | 06/26/2019 |
| Surfacing and 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 |
| Plans Preparation | Removal of Geotechnical Boring Stick Logs on Plans | 09/10/2018 |
| Miscellaneous | Roundabout Design Exceptions | 05/09/2018 |
| 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 |
| Signing & Pavement Markings | Type XI Sign Sheeting – Application (see update 1/11/2022) |
09/26/2017 |
| Hydraulics | Updated Culvert Bedding and Hydraulic Standards | 09/22/2017 |
| Bridge | Minimum Bridge Deck Thickness | 2/06/2017 |
| Bridge | Bridge Plan Drawing Numbers, Q Sheet | 12/30/2016 |
| Surfacing | Guidance on the Selection of Crushed Cover Aggregate – Cover Material | 12/21/2016 |
| Signing & Pavement Markings | Pavement Markings Removal | 11/22/2016 |
| Miscellaneous | 2016 Road Design Manual and Geometric Design Standards | 10/31/2016 |
| Plans Preparation | Project Plans – Table of Contents | 10/27/2016 |
| Erosion Control & Environmental | Temporary Erosion Control | 10/12/2016 |
| Miscellaneous | Records Management Policy | Records Management Procedure | 09/16/2016 |
| Surfacing | Tack and Fog Seal | 06/17/2016 |
| Surfacing & Typical Sections | Taper Rates for Transitioning Shoulder Widths | 02/19/2016 |
| Roadside Barrier | Supplemental Specification Section 605 - Concrete Barrier Rail | 02/02/2016 |
| 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 | Changes to Fencing Items – Combination Fence and R/W Monument Breaks | 10/08/2014 |
| Fencing & Right-of-Way | Right-of-Entry Procedure | Right-of-Entry Form Template | 04/25/2014 |
| Miscellaneous | Geometric Design Standards for Urban & Developed Areas | 03/20/2014 |
| Grading | Obliterate Roadway | 03/19/2014 |
| Surfacing & Typical Sections | Chip Seal Guidelines | 12/06/2013 |
| Erosion Control & Environmental | Guidance for the Topsoil & Seeding Summary | 11/26/2013 |
| Roadside Barrier | Guardrail Post Information | 10/21/2013 |
| Miscellaneous | Cattle Guard Nomenclature | 10/03/2013 |
| 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 | Durable Interim Striping | 11/30/2012 |
| Signing & Pavement Markings | Temporary Striping (see update 06/26/19) |
11/16/2012 |
| Surfacing & Typical Sections | Revised Rounding Criteria for Subgrade Widths | 11/08/2012 |
| Surfacing & Typical Sections | Blotter | 10/31/2012 |
| Surfacing & Typical Sections | Final Sweeping and Brooming | 10/15/2012 |
| Signing & Pavement Markings | Use of Vehicle Speed Feedback Signs (VSFS) on the State Maintained System - VSFS Guidelines | 09/12/2012 |
| Traffic Control | Traffic Control and Sequence of Operation | 08/27/2012 |
| Surfacing & Typical Sections | 30-year Pavement Design at Bridge Ends (See Supplemental 4/29/2015) |
05/24/2012 |
| Traffic Control | Guidelines - Interstate Median Crossovers | 02/28/2012 |
| Curbs, Ramps, and Sidewalk | ADA Curb Ramp Design Requirements | 02/10/2012 |
| Signing & Pavement Markings | Delineation on Non-Interstate Roadways | 02/07/2012 |
| Curbs, Ramps, and Sidewalk | Sidewalk Permit - Revised | 01/31/2012 |
| Surfacing & Typical Sections | Aggregate Treatment | 01/03/2012 |
| Surfacing & Typical Sections | PTW Surfacing/Subgrade Treatment | 10/28/2011 |
| Roadside Barrier | W-Beam Guardrail Height | 10/04/2011 |
| Traffic Control | Median Crossover Changes (see update 02/28/12) |
07/06/2011 |
| Grading | Mass Diagram in Blue Sheet Plans | 06/30/2011 |
| Surfacing & Typical Sections | Bituminous Prime (see update "Aggregate Treatment" 01/03/12) |
02/28/2011 |
| Fencing & Right-of-Way | Wildlife Friendly Fence Details | 12/30/2010 |
| Curbs, Ramps, and Sidewalk | Public Rights-of-Way Accessibility Guidelines (PROWAG) | 11/19/2010 |
| Signing & Pavement Markings | Sign Replacement to Maintain Minimum Sign Retroreflectivity and Sign Sheeting Policy | 10/06/2010 |
| 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) |
09/23/2010 |
| Roadside Barrier | W-Beam Guardrail Height (see update 10/04/2011) |
09/13/2010 |
| Curbs, Ramps, and Sidewalk | Public Rights-of-Way Accessibility Guidelines (PROWAG) Adopted | Guidelines | 08/17/2010 |
| Grading | Shrink/Swell Factors in Grading Frames | 03/24/2010 |
| Roadside Barrier | Guardrail End Section Widening - Modification | 02/10/2010 |
| Surfacing & Typical Sections | Bituminous Prime (see update 02/28/11) |
01/15/2010 |
| Grading | Balanced Earthwork | 01/13/2010 |
| Erosion Control & Environmental | Furrow Ditches - Clarification | 12/17/2009 |
| Erosion Control & Environmental | Furrow Ditches (see supplemental 12/17/09) |
11/30/2009 |
| Miscellaneous | Type B Scale Sites | 09/14/2009 |
| Miscellaneous | Electrical Special Provisions | 03/26/2009 |
| Surfacing & Typical Sections | Recycled Surfacing Options | 03/16/2009 |
| Surfacing & Typical Sections | Use of Cold Millings in Federal-Aid Projects | 03/10/2009 |
| Surfacing & Typical Sections | Application Rate - Seal (CRS-2P) (supplemented with memo "Tack and Fog Seal" - 06/17/2016) |
01/12/2009 |
| Roadside Barrier | Guardrail End Section Widening (see update 02/10/10) |
11/26/2008 |
| Surfacing & Typical Sections | Fog Seal and Isolation Lifts (Partially Updated with memo "Tack and Fog Seal" - 06/17/2016) |
10/06/2008 |
| Grading | Mass Diagram and Grading Frames | 08/19/2008 |
| Grading | Mass Diagrams (see supplemental 08/19/08 and update 06/30/11) |
07/07/2008 |
| Miscellaneous | Contract Time Calculation Procedures | 06/03/2008 |
| Curbs, Ramps, and Sidewalk | Curb Dimensions | 04/30/2008 |
| Miscellaneous | Specialty Items | 04/25/2008 |
| Surfacing & Typical Sections | Aggregate Treatment | 02/28/2008 |
| Miscellaneous | Worker Visibility | 11/16/2007 |
| Fencing & Right-of-Way | Wildlife Fence Issues | 04/06/2007 |
| Plans Preparation | CADD Procedures for Hydraulic Details | 03/27/2007 |
| Surfacing & Typical Sections | Road Design Manual - Chapter 9: Superelevation | 01/08/2007 |
| Miscellaneous | Special Provisions Format | 07/31/2006 |
| Signing & Pavement Markings | Pavement Marking Quantities (see supplemental 11/30/12) |
07/20/2006 |
| Signing & Pavement Markings | Temporary Pavement Markings | 03/23/2006 |
| Surfacing & Typical Sections | Isolation Lifts | 12/14/2005 |
| Fencing & Right-of-Way | Retracement Surveys - a guideline for RW Plans | 08/11/2005 |
| Surfacing & Typical Sections | Isolation Lifts and Tack (Partially Updated with memo "Tack and Fog Seal" - 06/17/2016) |
06/29/2005 |
| Fencing & Right-of-Way | Access to Bridges | 02/14/2005 |
| Roadside Barrier | W-Beam Guardrail Reassessment of the BCT | 07/12/2004 |
| Surfacing & Typical Sections | Widening Projects - Vertical Notch | 04/12/2004 |
| Signing & Pavement Markings | Temporary Pavement Markings | 01/16/2004 |
| 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 |