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Pacific Hwy/Gaarde/McDonald Intersection Improvement
Conceptual Design
Updated January 23, 2012
Virtual Open House:
According to the most recent community attitudes survey, traffic congestion continues to
be a major concern for city residents. In an effort to reduce traffic congestion, the
city is asking for your constructive comments on proposed improvements to the Pacific
Hwy./Gaarde St./McDonald St. intersection.
Tigard and our partners at ODOT have developed conceptual design alternatives to
improve traffic flow and safety at this intersection. Our plan is to gather as
many of your comments as possible as we narrow down the range of alternatives.
Our goal is to find the design that makes the best use of taxpayer funds to
improve our mobility and safety through this intersection.
Conceptual designs recommended for further study are:
- Concept B2: Widen the Gaarde and McDonald approaches and add a third southbound lane on Pacific Hwy/99W
- Concept C2: Add a third southbound lane and northbound right and dual left turn lanes on Pacific Hwy/99W
- Concept C5: Add a third southbound lane and northbound right turn lane on Pacific Hwy/99W
- NOTE: Along with the vehicular travel lanes shown, each option includes widened sidewalk and
bike lane in the areas of new construction and a new crosswalk across the north side of the intersection.
Options considered, but not recommended:
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The three options above are recommended because they provide the best value for the public dollar.
Other options were considered, but not recommended because they would either a) cost too much, b) provide
less benefit than other options of similar cost, or c) would not provide enough benefit.
Timeline:
Tigard, ODOT, and a consultant team will begin the detailed engineering process this spring after
the 'winning' concept has been chosen. It takes a couple of years to design a project of this magnitude,
and design is followed by coordination with utilities and acquisition of right-of-way. Actual
construction work on this project is still a few years in the future.
Funding:
$5 million is currently set aside for this project from City, State, and Federal sources.
As both options B2 and C2 would likely cost more than $5 million, some additional funding would be
necessary from the city (such as a portion of existing gas tax revenue) or from our agency partners
to complete the project.
Do you have any questions?
Would you like to meet in person to discuss this project? If yes, please contact:
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Do you have any questions?
Would you like to meet in person to discuss this project? If yes, please contact:
Mike McCarthy
Sr. Project Engineer
503-718-2462
Project Purpose
This conceptual design project is a technical feasibility
study for improvements to the Pacific Highway
99W/Gaarde/McDonald intersection. It is a joint effort
between the City of Tigard and ODOT to analyze and
develop potential intersection concepts.
Project Overview
The project includes the following phases of work:
• Review of existing plans and studies
• Existing year (2010) traffic analysis
• Future year (2035) traffic analysis
• Development of improvement concepts
• Evaluation of selected concept
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Preliminary Analysis
Completed Fall, 2011
Eight conceptual design options were analyzed. These options were evaluated based on factors such as traffic flow,
capacity, safety, property impact, business impact, and cost (expressed in order of magnitude—not actual dollar
figures). Click here to see the conceptual
designs and preliminary analysis summary.
Based on the analysis, the project team recommends three concept designs be advanced to the detailed analysis
phase. The TTAC concurred with the project team's recommendation at its September 28 meeting, and
City Council concurred at the October 18 meeting.
The designs are:
Concept A: Widen all approaches
Concept B: Focus widening on the Gaarde and McDonald Street approaches
Concept C: Focus widening on the Pacific Highway approaches
At this point in the process, there is room for minor variations within each of the concepts;
variations might include the addition or removal of a right turn lane, etc.
Existing Conditions
Collisions
The 99W/Gaarde/McDonald intersection
has a high frequency of collisions on
Highway 99W, with a substantial
number of rear-end collisions.
Bicycle and Pedestrian
The north leg of the project intersection does not
have a crosswalk, and east-west bike lanes terminate
200 feet from the intersection.
Motor Vehicle Operations
In the PM peak, the project intersection operates at or
near capacity, with the northbound left turn and the
eastbound through movements (Gaarde to McDonald)
experiencing the most delay, and large platoons of
vehicles moving southbound. The eastbound through
movement experiences high delay in the AM as well.
Transit
Northbound buses stop in the flow of traffic on the
far side of the project intersection, conflicting with
through traffic in the right lane of 99W northbound.
Future No-Build
PM Peak Hour
2035 Motor Vehicle Volumes:
Total entering volume at the project intersection is projected
to increase 46%.
Intersection Operations:
Analysis shows that the intersection operates over capacity
under future no-build conditions in the PM, with particularly
high delay for the eastbound through, westbound through,
northbound left, and southbound through movements.
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Click here to view all eight concepts considered in the preliminary analysis.
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Queuing:
Added growth in vehicle volumes in the future put additional
strain on some of the movements at the intersection creating long
queues. These movements are the eastbound left, eastbound
through, and northbound left.
AM Peak Hour
2035 Motor Vehicle Volumes:
Total entering volume at the project intersection is projected to
increase 58%.
Intersection Operations:
Analysis shows that the intersection operates over capacity under
future no-build conditions in the AM, with particularly high delay for
the northbound through and eastbound through movements.
Queuing:
Added growth in vehicle volumes in the future put additional strain
on some of the movements at the intersection creating long
queues. These movements are the eastbound left, eastbound
through, and northbound left.
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