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Design Memos

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

 
Bridge Memos Released
Specifications for Concrete used in Bridges 02/08/11
Concrete Deck, Assumed Sacrificial Wearing Surface and Concrete Strength 12/02/09
Access to Bridges 02/14/05
Salvaged Bridge Material 09/30/03
Vertical Clearance Railroad Separations 06/19/03
Structure Excavation on End Bents as a Pay Item 10/03/00
 
Curb and Guardrail Memos Released
Concrete Barrier Compliance 01/05/12
Hardware Compliance - Concrete Barrier 12/02/11
W-Bean Guardrail Height 10/04/11
Guardrail End Section Widening – Modification 02/10/10
Concrete Barrier Installation - Clarification 11/12/09
Median Barrier Installation 10/20/09
Guardrail End Section Widening 11/26/08
Public Interest Finding on Guardrail Terminal Sections and Impact Attenuators 12/19/07
Bridge Approach Guardrail Details 09/17/07
W-Beam Guardrail Reassessment of the BCT 07/31/07
Median Concrete Curb - Type B 07/26/07
Concrete Median Barrier Rail 08/27/03
 
Detours and Crossovers Memos Released
Interstate Median Crossover Guidelines 02/28/12
Milling Tapers 11/02/05
Temporary Detours 07/01/03
 
Erosion Control Memos Released
Erosion Control Blanket and Turf Reinforcement Mat 12/17/09
Permanent Erosion & Sediment Control Design Guidelines 12/28/05
 
Fencing and Right of Way Memos Released
Wildlife Friendly Fence Details 12/30/10
Wildlife Fence Issues 04/06/07
MDT Fencing Policy and Procedure (Non-Interstate) 04/10/06
Retracement Surveys - a guideline for RW Plans 08/11/05
R/W Bureau Red Line Process 12/05/02
 
Grading Memos Released
PTW Surfacing/Subgrade Treatment 10/28/11
Shrink/Swell Factors in the Grading Frames 03/24/10
Balanced Earthwork 01/13/10
Furrow Ditches - Clarification 12/17/09
Furrow Ditches 11/30/09
Mass Diagram and Grading Frames 08/19/08
Mass Diagram 07/07/08
Haul Quantities 12/21/07
Embankment-in-Place 11/27/06
Back Slope Rounding 01/27/03
Placing Soils Information on Road Plans 11/18/01
 
Hydraulic Memos Released
Reinforced Concrete Box – Steel Pipe Options 08/24/10
New RCP Fill Height Tables 08/13/10
Culverts – Abandon in Place 06/25/10
Special Culvert Installation Guidelines | Details 02/20/09
Alternative Culvert Pipe Material Selection Guidelines 06/12/07
Alternative Culvert Pipe Material Selection Guidelines
Part B		 06/12/07
Culvert Excavation - Clarification 11/27/06
Culvert Excavation 11/17/06
Guidelines for Hydraulic Report Data as Requested by the DFWP 05/18/05
Hydraulic Reports 04/05/05
DEQ Storm Drain/Water Main Requirements 06/15/04
Water Resources Investigations Report 03-4308:
USGS - Methods for Estimating Flood Frequency in Montana Based on Data through Water Year 1998		 03/29/04
Pipe Cleaning 09/05/03
Culvert and Trench Excavation 07/24/02
 
Miscellaneous Memos Released
Wetland Table 05/09/12
2005 Edition Detailed Drawings Supplemental Release 03/01/12
EPM/Design Meeting Minutes 02/10/12
Sidewalk Permit - Revised 01/31/12
Public Rights-of-Way Accessibility Guidelines 11/19/10
Scales on the title Sheet 08/27/10
Public Rights-of-Way Accessibility Guidelines (PROWAG) Adopted | Guidelines 08/17/10
Road Design Manual - Chapter 9: Superelevation 01/08/07
Intelligent Transportation Sytems (ITS) 01/30/07
ADA Ramps - Truncated Domes 01/07/05
Context Sensitive Solutions on Projects 10/23/03
Speciality Items 04/25/02
 
Pavement Memos Released
Aggregate Treatment 01/03/12
Percent Asphalt Map 06/14/11
Project Specific Asphalt Content 04/29/11
Type I and Type II Cover Material Selection 04/29/11
Bituminous Prime 02/28/11
Reference Posts on Title Sheets 01/13/11
PTW Surfacing/Subgrade Treatment 09/23/10
Bituminous Prime 01/15/10
Recycled Surfacing Options 03/16/09
Use of Cold Millings Fed Aid Projects 03/10/09
Modified Surfacing Design Requirements 02/09/09
Application Rate - Seal (CRS-2P) 01/12/09
Fog Seal Isolation Lifts 10/06/08
Plant Mix Special Provisions 06/11/08
Tack and Aggregate Tack Quantities 01/08/08
Fog Seal 12/28/07
PG 64-34 Asphalt Binder 07/26/06
Revised Surfacing Structural Coefficients and Layer Thicknesses 05/11/06
1/2 in (12.5 mm) Plant Mix Surfacing 01/04/06
Isolation Lifts 12/14/05
Surfacing Design Guidelines 04/07/05
Cover Material Revision Asphalt Cement Quantities 06/29/04
Widening Projects - Vertical Notch 04/12/04
Colored Concrete 12/15/03
Aggregate Treatment 07/28/03
Aggregate Treatment 07/23/03
Isolation Lifts and Tack in the Payment for Plant Mix 06/29/05
Asphalt Cement Content in Grade S Plant Mix 05/15/02
 
Plan Preparation Memos Released
Quantity Splits Revision 02/15/12
Significant Figures in Road Plans 11/12/09
Worker Visibility 11/16/07
Project Limits 01/05/07
Horizontal Curve Data 11/29/06
Special Provision 07/31/06
Summary Subtotals 04/06/06
Quantity Splits Reference Guide for Designers 11/04/05
Quantity Splits 10/14/05
Plans Change Clear Zone Table 08/23/05
Road Design Manual Revision 03/09/05
Title Sheet - Design Data 01/10/05
Project Connections to the Existing Roadway 08/21/02
Curb Dimensions 04/30/08
Contract Time Calculation Procedures 06/03/08
 
Signing, Marking and Electrical Memos Released
Deliniation on Non-Interstate Roadways 02/07/12
Sign Replacement to Maintain Minimum Sign Retroreflectivity and Sign Sheeting Policy 10/06/10
Policy on Sign Sheeting Materials for Permanent Signs 09/29/10
Electrical Special Provisions 03/26/09
Pavement Marking Quantities 07/20/06
Temporary Pavement Markings 03/27/06
Rumble Strip Policy Revision 09/30/04
Temporary Pavement Markings 01/16/04
Reflectors on Concrete Barrier 01/28/03
Pavement Marking Quantities 04/10/02