Page 106 - TransportationPlanUsetsGuide

Issues that need to be examined in greater detail include:

• Evaluate alignment options and their environmental impact;
• Integrate the proposal with the concept plan and transportation system plan for the newly ex-
panded UGB area and any new Urban Reserves that are designated in the area;
• Address any requirements that may result from adoption of an exception to Goal 14 (if needed)
for an urban facility outside the UGB;
• Integrate the proposal with the regional mobility corridor between Tigard to Wilsonville to ensure
these east-west arterials and I-5 itself could effectively function together; and
• Determine the most appropriate approach to connecting the Southern Arterial to I-5, including
options for improvements to the I-5/North Wilsonville interchange, or consideration of extending
the Southern Arterial east across I-5 to Stafford Road, thereby providing better access to I205.

Many of the regional conditions can be met within the land use planning for the recent UGB expansion areas
and/or Urban Reserves areas. Land use planning processes within the area may require additional transpor-
tation system refinement planning to integrate the plan with the I-5 to Highway 99W corridor strategy.

Since the completion of the I-5/99W Connector Study, Washington County led the Basalt Creek Transporta-
tion Refinement Plan along with Metro, ODOT and the Cities of Tualatin and Wilsonville. The purpose of this
ADOPTED TEXT The plan sets the stage for land use concept planning and comprehensive plan development for the Basalt
refinement plan was to determine the major transportation system to serve the Basalt Creek Planning Area.

Creek area. The need to plan for the future transportation system was driven by future growth in the Basalt
Creek area itself as well as almost 1000 acres of future industrial development targeted for surrounding
areas. This plan refined the recommendations from the I-5/99W Connector Study and the Regional Trans-
portation Plan, generally for the area between 124th Avenue on the west, and I-5 on the east. As a result of
this planning effort agreement was reached regarding a set of roadway improvements including the exten-
sion of SW 124th Avenue, a new east-west roadway between that extension and Boones Ferry Road, a new
overcrossing of I-5 to Stafford, a new overcrossing of I-5 at Day Road, and several upgrades to the existing
roadway network between Tualatin and Wilsonville. The results of the Basalt Creek Transportation Refine-
ment Plan have been incorporated into the multi-modal network of complete streets depicted on the various
transportation maps in this TSP.

West of 124th Avenue and through the Brookman Addition Concept Plan area additional refinement effort is
still needed. There continue to be concerns related to potential urban development, and the intersection of
the Southern Arterial with Highway 99W. During the development of the Brookman Addition Concept Plan the
ultimate location of Southern Arterial was not known. The coordination of the two processes resulted in the
recommendation of the Brookman Addition Concept Plan that the existing intersection of Brookman Road
and Highway 99W be realigned to the north to avoid conflicts with a potential Southern Arterial alignment
further south. The Brookman Addition Concept Plan indicated that Brookman Road would serve as a collec-
tor roadway, to provide access to future development within the area. No identified location for the Southern
Arterial has been established since the adoption of the Brookman Addition Concept Plan, the I-5 to 99W Con-
nector Study and designation of Urban Reserves south of Brookman Road. Therefore, this area remains as a
refinement area.

90 PART 3: TRANSPORTATION MODAL ELEMENTS
Effective November 27, 2015 • Updated December, 15 2016