HomeMy WebLinkAbout015_Simkins-2B-4B_Traffic_Update_LetterAugust 9, 2024
Taylor Lonsdale
City of Bozeman
20 East Olive Street
Bozeman, MT 59715
Reference: Simkins North Park Site Plan – Tract 2-B & 4-B Trip Generation Update
Project No. 21363.01
Dear Taylor:
The purpose of this letter is to provide a traffic impact study (TIS) update for the
North Park Master Site in Bozeman, Montana due to the proposed change in square
footage of land uses on Tracts 2-B and 4-B, located northeast of Wheat Drive and
south of Frontage Road. Tracts 2-B and 4-B include a truss shop, Simkins-Hallin main
store, storage buildings, and truck deliveries. Traffic impacts were previously
analyzed via the North Park Master Site Plan Traffic Impact Study completed by
Sanderson Stewart in June 2023.
The updated proposed layout for the main retail store includes a total building size of
42,703-square feet. This is approximately 177 percent of what was assumed in the
original TIS. The new layout for the truss shop is 54,082-square feet, which is 265
percent of the original assumption in the TIS. The proposed site plan for Tracts 2-B
and 4-B is attached.
Access to Tracts 2-B and 4-B would be via two (2) full-movement approaches from
Wheat Drive. Externally, this road provides access to Mandeville Lane and to North 7th
Avenue via Cultivar Street.
The June 2023 TIS evaluated trip generation for the North Park Master Site and
assumed land uses included mini-storage, a hotel, multifamily housing, offices,
general industrial uses, warehousing, and the Simkins-Hallin storefront with
supporting uses. The original TIS assumed a truss shop, main store, and truck
delivery uses on Tracts 2-B and 4-B.
This letter will compare trip generation rates for the proposed updated Tracts 2-B and
4-B building sizes to previous assumptions for Tracts 2-B and 4-B and the total site.
The assumed land uses from the Institute of Transportation Engineers (ITE) Trip
Generation Manual for the proposed buildings on Tracts 2-B and 4-B were
Manufacturing (Land Use Code 140) and Building Materials and Lumber Store (Land
Taylor Lonsdale
August 9, 2024
Page 2
Use Code 812). There is a proposed drive-thru building shown on the site plan which
was not included in the trip generation calculations as this building will be used
mainly for picking up orders made in the main store building and would not create
new external trips. Trip generation was then calculated using the square footage of
the use type as the independent variable. Truck trips were previously estimated
based on information provided by Simkins-Hallin and have not changed. The results
of the updated trip generation calculations are shown in Table 1 (attached).
Table 1 also shows separate trip generation totals for Tract 3-B of the Simkins-Hallin
site, Tract 5, and Tract 3 as they each have begun the City review process. The
remaining potential future development anticipated on the North Park Master Site is
shown following these three (3) currently proposed sites.
In total, the entire North Park Master Site is now proposed to generate approximately
107 percent of the weekday trips that were calculated in the June 2023 study if Tracts
2-B and 4-B and the remaining tracts are developed as currently proposed. When
comparing trip generation totals only for Tracts 2-B and 4-B, it was found that the
new proposed building sizes on Tracts 2-B and 4-B are projected to generate 182
percent of the total weekday trips assumed in the TIS. The currently proposed sites
(Tract 3, Tract 5, Tract 3-B, and Simkins-Hallin) account for approximately 65 percent
of the total external weekday trips calculated in the June 2023 study.
It was found in the June 2023 study that a traffic signal is projected to become
warranted at the North 7th Avenue/Cultivar Street intersection approximately upon
full buildout of the North Park Master Site. Therefore, at such time that active site
applications for development on the remainder of the Master Site equal the original
daily total number of trips, the need for this traffic signal should be reevaluated and
programmed as necessary as remaining tracts applications are reviewed. Once
Cultivar Street is built, traffic volumes should be checked yearly to monitor traffic
signal warrants.
If you have any questions or concerns, please feel free to contact me at 406-922-4306
or jstaszcuk@sandersonstewart.com.
Sincerely,
Joey Staszcuk, PE, PTOE, RSP1
Senior Engineer | Community Transportation Studio Manager
Taylor Lonsdale
August 9, 2024
Page 3
SJW/ars/SG
Enc:
Site plan
Trip generation table
P:21349_03_North_Park_MSP_8.9.2024
Intensity Units total enter exit total enter exit total enter exit
141 1000 Sq. Ft.670 335 335 96 73 23 104 32 72
230.95 1000 Sq. Ft.395 197 198 39 30 9 42 12 30
24.1 1000 Sq. Ft.347 173 174 40 33 7 52 18 34
32.86 1000 Sq. Ft.560 280 280 52 32 20 74 34 40
53 1000 Sq. Ft.91 45 46 9 7 2 10 3 7
54 1000 Sq. Ft.257 128 129 37 28 9 40 12 28
43 1000 Sq. Ft.728 364 364 68 42 26 96 44 52
36 Trucks 72 36 36 2 0 2 5 5 0
3120 1558 1562 343 245 98 423 160 263
75 1000 Sq. Ft.109 54 55 7 4 3 11 5 6
150 1000 Sq. Ft.257 128 129 26 20 6 27 8 19
50 Dwelling Units 337 169 168 20 5 15 26 16 10
265 1000 Sq. Ft.1291 645 646 196 172 24 172 24 148
5114 2554 2560 592 446 146 659 213 446
(1)Mini-Warehouse - Land Use Code 151*Units = 1000 SF GFA
Average Weekday Average Rate = 1.45 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.09 (59% entering, 41% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.15 (47% entering, 53% exiting)
(2)Hotel - Land Use Code 310*Units = Rooms
Average Weekday Average Rate = 7.99 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.46 (56% entering, 44% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.59 (51% entering, 49% exiting)
(3)General Light Industrial - Land Use Code 110*Units = 1000 SF GFA
Average Weekday Average Rate = 4.87 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.74 (88% entering, 12% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.65 (14% entering, 86% exiting)
(4)General Office Building - Land Use 710*Units = 1000 SF GFA
Average Weekday:Average Rate = 10.84 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 1.52 (88% entering, 12% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 1.44 (17% entering, 83% exiting)
(5)Warehousing - Land Use Code 150*Units = 1000 SF GFA
Average Weekday Average Rate = 1.71 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.17 (77% entering, 23% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.18 (28% entering, 72% exiting)
(6)Multifamily Housing (Low-Rise) - Land Use 220*Units = 1000 SF GFA
Average Weekday:Average Rate = 6.74 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.40 (24% entering, 76% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.51 (63% entering, 37% exiting)
(7)Manufacturing - Land Use Code 140*Units = 1000 SF GFA
Average Weekday Average Rate = 4.75 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 0.68 (76% entering, 24% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 0.74 (31% entering, 69% exiting)
(8)Building Materials and Lumber Store - Land Use Code 812*Units = 1000 SF GFA
Average Weekday Average Rate = 17.05 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 1.59 (62% entering, 38% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 2.25 (46% entering, 54% exiting)
(9) Small Office Building - Land Use Code 712* Units = 1000 SF GFA
Average Weekday Average Rate = 14.39 (50% entering, 50% exiting)
Peak Hour of the Adjacent Street, One Hour between 7 and 9 AM:Average Rate = 1.67 (82% entering, 18% exiting)
Peak Hour of the Adjacent Street, One Hour between 4 and 6 PM:Average Rate = 2.16 (34% entering, 66% exiting)
*Trip Generation, 11th Edition , Institute of Transportation Engineers, 2021
**Trip Generation Handbook, 3rd Edition , Institute of Transportation Engineers, 2017
†Truck Deliveries calculated based on information from Simkins-Hallin
Total Site Gross Trips
Independent Variable Average Weekday
Warehousing5
Multifamily Housing (Low-Rise)6
General Light Industrial3
Tract 3-B (Simkins-Hallin)
Warehousing5
Mini-Warehousing1
Tract 5
Warehousing5
Office9
Showroom & Sales8
Truck Deliveries†
Other Future Development
Current Proposed Gross Trips
Tract 1
PM Peak HourLand Use AM Peak Hour
Current Application/Review in Process
Tract 3
Timber Manufacturing7
Main Store8
Tract 2-B and 4-B (Simkins-Hallin)
Truss Shop7
Tract 4
Tract 6