Appendix D Traffic Impact Analysis - westplainseis.com

(Note the proportional share responsibility for the Craig Rd. intersection was calculated as 34.2%
in the TIA)
Resulting LOS & Delay (sec):
HWY 2 / Craig: A/7.1
HWY 2 / East Site Access: B/13.4
HWY 2 / West Site Access: B/10.1
Craig Rd. - HWY 2 to 6 th Ave.: Widen Craig Rd. and provide site access intersection
improvements as assumed and identified in the TIA. Construction frontage improvements along
the Spokane Tribe site frontage. Widen road to accommodate a three lane roadway section and
bike lanes; approximately 45-50ft depending on the ultimate design level determination of
appropriate lane widths. Construct site access driveways as indicated in the site plan and such
that no access aligns with 12th Avenue.
Craig Rd/SR 902: Construct or fully fund construction of either a traffic signal and related
intersection improvements or a roundabout. (Note the proportional share responsibility for the
was calculated as 23.7% in the TIA)
Resulting LOS & Delay (sec): B/15.1 / A/8.2
HWY 2/Hayford Rd.: Commit to funding a proportional share (based on project and phase
generated traffic) to improvements to the 21 st Ave./18 th Ave. corridor at the time of construction
of said improvements (See further discussion of HWY2/Hayford mitigation in the previous
section).
6th Street: In the event that the 6th Street extension (near and east of Craig R.) is not completed
prior to project implementation, the Tribe shall fully fund development of the unfinished portion
of the 6th Street extension from approximately South Aspen Street to Craig Road. The City shall
enter into an agreement with the Tribe to reimburse the Tribe for cost of development of the 6th
Street extension through development of local traffic impact fee assessment areas.
12th Avenue: The Tribe shall fully fund the posting of signage for the eastbound traffic on 12th
Avenue and Craig Road stating “Local Access Only” or provide other similar means of
discouraging the use of 12 th Ave. by Spokane Tribe site traffic. 12th Avenue shall be considered
within the future traffic impact analysis described under Traffic Mitigation Measure B. If the
results of the updated TIA determine that the traffic mitigation identified for 12th Avenue should
be adjusted due to changes in future traffic background conditions, the recommendations shall be
subject to review and approval by the City prior to any modifications to the traffic mitigation
plan.
2032 Cumulative Mitigation Improvements
The improvements identified below in addition to the improvements identified above are required to
mitigate 2032 Cumulative With Project conditions. Prior to buildout of the Spokane Tribe site it is
recommended that the TIA be updated based on the traffic conditions present at that time and the
subject intersections reevaluated to determine if mitigations are necessary and to recalculate the
proportional share contributions. Any remaining credits or overage from previously constructed or
funded mitigations shall be applied to the proportional share amount identified below.
2032 Alternative 1 Mitigations (in addition to Alt. 1 Ph. 3 2019 mitigations above):
In lieu of constructing the mitigations identified in the TIA at the Lundstrom, Lawson, Garfield
intersections along HWY 2 is recommend that the project contribute a proportional share to
improvements to the 21 st Ave. alternative route which will relieve traffic from the HWY 2 corridor
and likely eliminate the need for improvements to the Lundstrom, Lawson and Garfield intersections.
West Plains Development – Spokane Tribe Page | 7
Traffic Impact Analysis Addendum July 18, 2011