HomeMy WebLinkAbout19 - Traffic Impact Study - Cottonwood SubdivisionCottonwood Subdivision
Preliminary Plat Application
Roads, Streets, and Alleys
Included in this section is a 2018 Traffic Impact Study for Cottonwood Subdivision by Marvin &
Associates. Please note that throughout the report “West Garfield Street” is referred to as “Club
House Lane”.
Streamline does not serve the project area currently. However, a discussion has started between
the project owners, Madison Engineering and HRDC Board Chair, David Kack, regarding a
potential stop on Cottonwood Road that would serve this part of town.
Please see the responses below to the items requested in Section 38.220.060 – Additional
Subdivision Preliminary Plat Supplements in the Bozeman Municipal Code:
a. Description. Describe any proposed new public or private streets, roads or alley, or
substantial improvements of existing public or private streets, roads or alleys. The
developer must demonstrate that the land to be subdivided has access onto a legal street.
Response: Access will be provided to the subdivision from two intersections with Cottonwood
Road; West Garfield Street and Loyal Drive. Cottonwood Road is being widened along the entire
western border of the subject parcel (from Town Pump south to the Farmers Canal crossing) and
infrastructure improvements for that project have been approved. Construction has begun in
summer 2019. West Garfield is a collector and will have a 90-foot wide Right of Way (ROW).
All other streets within the subdivision will be local streets with 60-foot wide ROWs. Upon
acceptance of road improvements, these roads will be maintained by the City of Bozeman.
Where Stafford Avenue terminates at the north property line requires further explanation. A 40-
foot wide roadway easement is being obtained along the west side of the east property line of the
adjacent lot to the north owned by Major Brands Distributing Co. Inc. (Town Pump). It is
understood that the future development of the Town Pump property will require the construction
of a partial street section for Stafford Avenue within said easement to continue from the
Cottonwood Subdivision north to Huffine Lane to tie into the existing approach for the Town
Pump. The adjacent property owner to the east of Town Pump has indicated that they are not
interested in providing a roadway easement for Stafford Avenue on their property at this time.
It is proposed to build the full Stafford Avenue road section with Cottonwood Subdivision and
for 99.27 linear feet within said 40-foot roadway easement to our northern-most property line.
The transition between the full 60-foot ROW for Stafford Avenue to the 40-foot ROW on Town
Pump’s property is clarified with three drawings attached to this section. The first drawing,
Figure A, shows the two proposed road sections for Stafford Avenue; the future partial section to
be constructed on Town Pump’s property and the full road section to be constructed on the
Cottonwood Subdivision and within the 40-foot easement for 99.27 linear feet. The second
drawing, Figure B, shows the area of the transition from 60-foot ROW to 40-foot ROW in plan
Cottonwood Subdivision
Preliminary Plat Application
view. The third drawing is a preliminary easement exhibit showing the 40-foot Public Roadway
Easement to be obtained on the Town Pump property.
b. Access to arterial. Discuss whether any of the individual lots or tracts have access
directly to arterial streets or roads, and if so, the reason access was not provided by
means of a street within the subdivision and how the access complies with section
38.400.090.
Response: Cottonwood Road is a Principal Arterial and none of the proposed lots have direct
access to it. Access to Cottonwood Road will be achieved through the intersections of W.
Garfield Street and Loyal Drive.
c. Modification of existing streets, roads or alleys. Explain any proposed closure or
modification of existing streets, roads or alleys.
Response: The only proposed modification to an existing street is the widening of Cottonwood
Road as previously mentioned. The improvements to Cottonwood Road are a separate project
that has been approved by the MDT and City and will be starting construction in summer 2019.
All other roads constructed within this subdivision will be contained on the subject property
and will not cause road closures for any existing streets.
d. Dust. Describe provisions considered for dust control on alleys.
Response: If alleys are constructed on site they will be paved, which will mitigate any potential
problems associated with dust.
e. Pollution and erosion. Explain how street, road and alley maintenance will be provided
to meet the department of environmental quality guidelines for prevention of water
pollution and erosion.
Response: The roads will be dedicated to the City and will be maintained like the rest of the
roads in the City. The boulevards and other disturbed areas will be seeded and stabilized,
which is a best management practiced outlined by the MDEQ as a means to reduce pollution
and erosion control, and reducing sediment from running into the roads and inlets. Temporary
erosion control will also be provided at the dead ends of streets between phases of construction.
f. Traffic generation. Discuss how much daily traffic will be generated on existing local
and neighborhood streets, roads and alleys, when the subdivision is fully developed, and
provide the following information:
1. The report format must be as follows:
a. Trip generation, using the Institute of Transportation Engineers Trip
Generation Manual;
Cottonwood Subdivision
Preliminary Plat Application
b. Trip distribution;
c. Traffic assignment;
d. Capacity analysis;
e. Evaluation; and
f. Recommended access plan, including access points, modifications and any
mitigation techniques.
2. The report must include the following information:
a. Land use and trip generation in the form of a table of each type of land
use, the number of units or square footage, as appropriate, the trip rates
used (daily and peak) and resulting trip generation.
b. Traffic graphics, which show:
i. A.M. peak hour site traffic;
ii. P.M. peak hour site traffic;
iii. A.M. peak hour total traffic;
iv. P.M. peak hour total traffic; and
v. Total daily traffic (with site-generated traffic shown separately).
c. A.M. and P.M. capacity analysis with an A.M. and P.M. peak-hour
capacity analysis provided for:
i. All major drive accesses that intersect collector or arterial streets
or roads; and
ii. All arterial-arterial, collector-collector and arterial-collector
intersections within one-half mile of the site, or as required by the
city engineer during the pre-application review, concept plan review,
or informal project review.
d. For two-way stop controlled intersections, analysis of whether the intersection
would satisfy signalization warrants if the two-way stop control was removed.
Response: Please see Traffic Impact Study performed by Marvin & Associates that includes the
requested information.
Cottonwood Subdivision
Preliminary Plat Application
g. Capacity. Indicate the levels of service (before and after development) of existing and
proposed streets and roads, including appropriate intersections, to safely handle any
increased traffic. Describe any anticipated increased maintenance that will be necessary
due to increased traffic and who will pay the cost of maintenance.
Response: Please see Traffic Impact Study performed by Marvin & Associates that includes the
requested information.
h. Bicycle and pedestrian pathways, lanes and routes. Describe bicycle and pedestrian
pathways, lanes or routes to be developed with the development.
Response: Bike lanes are included with the improvements to Cottonwood Road. All the roads
within the subdivision will have sidewalks on both sides for pedestrians. West Garfield Street
is considered a collector so it is likely to include bike lanes. However, it is unclear from the
Bozeman Transportation Master Plan (TMP) and Appendix K: Corridor Striping Plans of said
TMP whether the long-range plan for this section of West Garfield Street will include bikes
lanes or not. At this time, it is assumed that bike lanes will be required on West Garfield Street.
i. Traffic calming. Detailed drawings of any proposed traffic calming installations,
including locations and turning radius templates.
Response: No traffic calming installations are proposed on any of the new roads through the
site.
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LOT L,
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COTTONWOOD SUBD.
HUFFINE LANE
ALLEY
MADISON ENGINEERING
895 TECHNOLOGY BLVD SUITE 203
BOZEMAN, MT 59718
(406) 586-0262
FIGURE
B
Stafford Ave. R.O.W.
Cottonwood Subd.COTTONWOOD SUBDIVISION
BOZEMAN, MT
40' R.O.W. ALIGNMENT
STAFFORD AVE. NORTH OF SUBD.
1 inch =
0
SCALE
1000'
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