HomeMy WebLinkAboutRS_Parking Analysis_v2From: Matt <Mattp@gibsontraffic.com>
Sent: Thursday, October 28, 2021 10:09 AM
To: Kyle Stevens <kstevens@grouparch.com>
Subject: Harrington Redevelopment retail traffic study update, GTC 20-112
Parking Information for Harrington Development 69 residential units and 4,125 SF of HTSD Restaurant
The parking demand calculations for the combined residential and commercial uses are based on the
information provided in Parking Generation, 5th Edition by the Institute of Transportation Engineers
(ITE). The parking demand for the commercial portion of the development is based on ITE LUC 932,
HTSD – Family, during a non-December, non-Friday weekday in a dense multi-use urban location or 6.47
vehicles per 1,000 SF. This would result in a demand of 27 parking stalls for the 4,125 SF of HTSD
Restaurant.
Based on King County Metro Transit’s Right Size Parking Project, the location of the proposed
development would have an anticipated unbundled parking demand rate of 0.84 parking stalls per unit
based on the number, type, and size of the units (42 one-bedroom and 27 two-bedroom) in the
development. This would result in a demand of 58 parking stalls for the 69 residential units.
Data provided in ITE Parking Generation shows the percent of peak parking demand for different uses
for various hours of the day. Summarized below is the shared peak parking demand for the site using
the same square footage and building uses. It considers the number of parking spaces being utilized
throughout the day with shared parking for every use. Utilizing a shared parking methodology, the
development is anticipated to have a maximum parking demand of 64 parking spaces which will occur at
8 PM and 10 PM.
Shared Parking Summary
ITE Average 0.84 /unit 6.47 /1,000 SF
Multifamily Mid-Rise HTSD Restaurant
Total 69 57.96 4125 26.69
Hour
Beginning
% Peak
Demand
Peak
Demand % Peak
Demand
Peak
Demand
12:00-4:00
AM 100 58 0 0 58
5:00 AM 94 54 0 0 54
6:00 AM 83 48 0 0 48
7:00 AM 71 41 0 0 41
8:00 AM 61 35 0 0 35
9:00 AM 55 32 0 0 32
10:00 AM 54 31 87 23 55
11:00 AM 53 31 90 24 55
12:00 PM 50 29 100 27 56
1:00 PM 49 28 98 26 55
2:00 PM 49 28 85 23 51
3:00 PM 50 29 73 19 48
4:00 PM 58 34 58 15 49
5:00 PM 64 37 63 17 54
6:00 PM 67 39 76 20 59
7:00 PM 70 41 78 21 61
8:00 PM 76 44 76 20 64
9:00 PM 83 48 55 15 63
10:00 PM 90 52 46 12 64
11:00 PM 93 54 0 0 54
Maximum 64
Matthew Palmer, P.E.
Gibson Traffic Consultants, Inc.
2813 Rockefeller Ave, Suite B
Everett, WA 98201
ph: 425.339.8266
fax: 425.258.2922
web: gibsontraffic.com