Posted: March 05, 2018
Rapid City
Agenda Item Summary

Agenda Item Ref. #: 18TP006 – Acknowledge the I-90 Exit 61 to Exit 67 Corridor Study - Final Report

Agenda Item Title:

18TP006 – Acknowledge the I-90 Exit 61 to Exit 67 Corridor Study - Final Report

Origination Group:
Metropolitan Planning Organization
Origination Meeting Date:
Stage 2 Group Name:
Planning Commission
Stage 2 Meeting Date:
City Council Hearing Date:
Rapid City Area Metropolitan Planning Organization
Staff Contact:
Kip Harrington, Planner III
Agenda Item Summary:
Attached for your review and acknowledgement is the I-90 Exit 61 to Exit 67 Corridor Study Final Report. The study, initiated by SDDOT in conjunction with the MPO, identifies recommendations to address the following two issues: 1. I-90 Corridor Capacity: Traffic analyses were conducted to assess the need for additional travel lane capacity along I-90, regional roadway network improvements, or other multimodal mobility enhancements to provide acceptable traffic operations and safety today and into the future. 2. Interchange Access: The current interchange at Exit 63 provides for movements to and from the west only, which is not in compliance with current Federal Highway Administration policy requiring that interchanges provide service for all movements. The study investigated options to bring Exit 63 into compliance with current policy. The study recommendations include an ultimate I-90 typical selection and alignment. Year 2045 traffic volumes do not show a need for six lanes, and any future widening should be in the form of auxiliary lanes between Exits 61 and 63. Eleven interchange alternatives were evaluated, with three feasible options identified in the study. These options are a diamond interchange at West Gate Road, a diamond interchange at Highway 1416, or a diverging diamond interchange at Highway 1416, at an estimated cost for the three options ranging from $11.3 million to $23.8 million. Additionally, the study provides a listing of recommended Intelligent Transportation Systems solutions that provide safety and operational benefits to the I-90 corridor and the surrounding roadway network.

Funding Source & Fiscal Impact (if applicable):

Funding Cost Center


Origination Recommendation Action:
Origination Recommendation Notes:
Planning Commission acknowledged: 2/22/2018; Public Works Committee: 2/27/2018
City Council Recommendation Action:

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