Middle Fork Snoqualmie River Road, Snohomish Co., Washington

From IHSDMDownload

User Information

Organization/Agency: DJ&A, PC

Basic Project Information

Project Name/Description: Middle Fork Snoqualmie River Road

Nature of the Project/Study: 3R, with alignment improvements that were due to IHSDM evaluation

Project Location: Snohomish County, Washington

Highway Length: 14 mi

Functional Classification: Rural Arterial

Design Speed: 35 mph

Posted Speed: 25-35 mph

Terrain Type: Mountainous

Application of IHSDM

IHSDM Module(s) used:

• Policy Review

• Crash Prediction

• Design Consistency

Purpose of using IHSDM on this project:

Review the alignment for inconsistency, spot improvement and overall improvement using the three modules mentioned above. Width and alignment alternatives were evaluated simultaneously to determine the quantifiable difference in each, as well as the expected safety of each alternative.

Stage(s) of the project development process in which IHSDM was applied (e.g., planning, preliminary design, final design, etc.):

Planning and Preliminary/Conceptual Design

How IHSDM results were used to make design decisions:

Revisions to alignment were evaluated quickly to evaluate options and design alternatives.