HomeMy WebLinkAbout18 - Traffic Impact Study - Palisade Apartments & Silver Creek Subdivision pbodin Palisade Apartments &
traffic Silver Creek Subdivision
services
Traffic Impact Study
Bozeman, Montana
P,N
6
Prepared For: f, L
S51C�P��
C&H Engineering and Surveying z77,
1091 Stoneridge Drive
Bozeman, MT 59718
July, 2018
130 South Howie Street
Helena, Montana 59601
406-459-1443
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Table of Contents
A. Executive Summary...................................................................................... I
B. Project Description........................................................................................1
C. Existing Conditions........................................................................................I
AdjacentRoadways..............................................................................2
TrafficData......................................................................................... 3
Additional Developments ......................................................... 4
Future Road Construction Projects.......................................................4
Levelof Service.....................................................................................5
D. Proposed Development..............................................................................5
E. Trip Generation and Assignment................................................................6
F. Trip Distribution ..........................................................................................9
G. Traffic Impacts Outside of the Development.............................................10
H. Long Range Traffic Projections................................................................11
1. Impact Summary& Recommendations....................................................11
List of Figures
Figure 1 — Proposed Development Site...................................................................2
Figure 2— Proposed Palisade Development Site Plan............................................7
Figure 3— Proposed Silver Creek Site Plan................ . .... ..... .............. 8
Figure4—Trip Distribution.......................................................................................9
List of Tables
Table 1 — Historic Average Daily Traffic Data..........................................................4
Table 2— 2018 Level of Service Summary..............................................................5
Table 3— Palisade Apartments Projected Trips......................................................6
Table 4— Silver Creek Subdivision Projected Trips ................................................8
Table 5—Additional Development Trip Generation.................................................9
Table 6— Future Level of Service Summary...........................................................10
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Palisade Apartments & Silver Creek Subdivision
Traffic Impact Study
Bozeman, Montana
A. EXECUTIVE SUMMARY
The Palisade Apartments is a 3.9-acre development located east of 27t' Avenue and south of
Tschache Lane in Bozeman, MT. The project would include up to 74 new residential units and
will produce 432 new daily trips in the area at full build-out. The Silver Creek Subdivisions
development is a 4.2-acre development located at the northwest corner of North 27t'Avenue and
West Oak Street.This project that includes 118 apartment units will produce 642 new daily vehicle
trips in the area. The development of these project will affect traffic conditions at the intersection
of 27 h Avenue and Oak Street. The developers should work with the City of Bozeman to ensure
that the planned traffic control improvements for the intersection of Oak Street and 27 h Avenue
are completed prior to the full build-out of these two projects. The developers should also restripe
Oak Street to take advantage of the existing left-turn lane configuration at 27t' Avenue and to
create a similar left-turn lane at 25t'Avenue. The long-term improvements for Oak Street include
widening the entire roadway to a five-lane cross-section from 25t`Avenue to 10 Avenue which
will be necessary to maintain traffic operations along the corridor through 2038.
B. PROJECT DESCRIPTION
This document studies the possible effects on the surrounding road system from two proposed
residential subdivisions located west of North 19a`Avenue along the east side of North 27t'Avenue
between Tschache Lane and West Oak Street in Bozeman,Montana. The document also identifies
any traffic mitigation efforts that the developments may require. The Palisade project would be
developed to include 42 two-bedroom apartment units and 32 row-house condominiums. The
Silver Creek Subdivision project will consist of 118 residential apartment units. Based on the City
of Bozeman Subdivision Regulations, the developers must study all effected intersections within
'/2 mile of a proposed development, which includes the intersections of North 27a' Avenue with
Baxter Lane, Tschache Lane, Breeze Lane, and Cobblestone Place, as well as the intersection of
25t'Avenue and Oak Street. The intersection of Tschache Lane with North 19a'Avenue was also
analyzed.
C. EXISTING CONDITIONS
The proposed Palisade development property currently consists of the undeveloped lots 5B and
5C located due west of Rose Park in the Annie Subdivision at the southeast corner of North 27t'
Avenue and Tschache Lane. The Silver Creek Subdivision is located adjacent to the Palisade
Development to the south at the northeast corner of North 27t`Avenue and West Oak Street. The
topography in this area is flat. See Figure 1 for a location map of the proposed developments.
Abelin Traffic Services 1 July,2018
Palisade Apartments&Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Fi ure 1- Proposed Develo ment Site
;++h
-
IT:1.
72
I Proposed Palisade JF
Development
t
Proposed Silver -�
Creek Subdivision"Site
�.
fA) la
r .
D'
• • • • <� ' I
i
b . n
` J t
Figure 1:Proposed Developments,study intersections,and road extensions
Adjacent Roadways
North 2711 Avenue is a two lane north/south major collector route which runs along the west
side of the Palisade Apartments and Silver Creek Subdivision.North 27`b Avenue extends north
of Oak Street and changes to Thomas Drive north of Baxter Lane. In recent years much of the
road has been reconstructed to accommodate development in this area. Between Oak Street
and Baxter Lane,North 27'Avenue has a newly constructed two-lane urban cross-section with
north and south bike lanes and a raised landscaped median. North 27'Avenue has a total road
width of 62 feet and the posted speed limit 25 MPH. The intersections with Tschache Lane,
Breeze Lane, and Cobblestone Lane are all STOP controlled on the side streets. The
intersections of North 27t'Avenue with Oak Street and Baxter Lane are STOP controlled on
Abelin Traffic Services 2 July,2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
North 27'h Avenue. Traffic data collected by ATS 2018 indicates that the roadway currently
carries 2,800 VPD.
Tschache Lane is a two-way east/west local route that provides access to the residential areas
west of North 19'h Avenue. Currently the road has a two-lane urban cross-section with a paved
width of 35-feet. Tschache Lane is STOP controlled at N 27'h Ave and the intersection with
North 19th Avenue is signalized. The roadway has a posted speed limit of 25 MPH and carried
2,500 Vehicles Per Day(VPD) in 2018 according to traffic data collected by ATS.
West Oak Street is an east-west principle arterial route which provides access to residential
areas west of North 19a' Ave. Oak Street has a paved width of 42-feet west of North 19th
Avenue with designated bike lanes. West of North 25'h Avenue the street widens to 90-feet to
accommodate four travel lanes,bike lanes, and a raised landscape median with left-turn lanes.
While the roadway technically has two through-lanes for eastbound traffic at 27'h Avenue,the
north lane is currently designated as a left-turn only lane for vehicles turning onto 27'h Avenue.
The posted speed limit is 35 MPH. Oak Street is controlled with a traffic signal at North 19'h
Avenue. Traffic data collected in 2017 by MDT indicates that Oak St Street currently carries
10,000 VPD west of 19'h Avenue.
Cobblestone Place is a two-way, east/west local street that extends from North 27'h Avenue
to the east and Tempest Court to the west. The road has a paved width of 32-feet with an urban
cross-section. Cobblestone Place is controlled by a STOP sign at the intersection with North
27`h Avenue. Traffic volumes on Cobblestone Place are approximately 200 VPD.
Breeze Lane is a two-way, paved east/west local road that provides access to the existing
residential developments west of North 27'h Avenue. The two-lane street has a paved width of
36 feet with an urban cross-section. Breeze Lane is controlled by a STOP sign where it ends
at 27'h Ave. Breeze Lane carries approximately 200 VPD.
North 2511 Avenue is a local north/south route that extends south from Oak Street to West
Babcock Street. North 25'h Avenue is controlled with a STOP sign where it intersects with
West Oak Street. The two-lane roadway has a paved width of 36 feet with an urban cross-
section.
Traffic Counts
The traffic data used for this report was collected on the surrounding road system by ATS in
July of 2018. The collected data includes turning movement counts at the intersections of
North 27'h Avenue with West Oak Street,Tschache Lane,Breeze Lane and Cobblestone Place,
and at the intersection of West Oak Street with North 25'h Avenue. Traffic data for North 27'h
Avenue with Baxter Lane and Tschache Lane with North 19'h Avenue were obtained from
Abelin Traffic Services 3 July,2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
traffic counts conducted in 2017 for other developments in this area. The raw traffic data is
included in Appendix A of this report.
Historic traffic data was also collected for Baxter Lane, Oak Street, and North 19ffi Avenue
from the Montana Department of Transportation. The data for this location is presented in
Table 1. The only location which has long-tern traffic volume data for this area is North 19a'
Avenue south of Baxter Lane, which is not likely representative of the long-term traffic
volumes on the adjacent roadways. Traffic volumes along North 19''Avenue have increased
at a rate of 1.2%annually over the last ten years.
Table 1 - Historic Average Daily Traffic Data
Location 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
Baxter Ln W.of N 19th
Ave. - - - - - - - 9,430 7,686 7,625
#16-3B-096
Oak St E.of N 19th
Ave - - - - - - - - 9,853 9,774
#16-3B-033
North 19th Ave S.of
Baxter Ln 123,290 23,710 22,950 24,350 23,480 23,670 24,030 24,810 26,879 25,739
#16-3B-030
Additional Developments
Additional development projects taken into account for this analysis include the Bozeman
West Development (216 units) located north of Tschache Lane and Phases 4 & 5 of the West
Winds Subdivision(73 units) located to the Southwest of the Palisade Development at Oak St
and Davis Lane. The traffic studies performed for these developments was reviewed and the
relevant traffic volume projections from each project was applied to the future traffic
projections in this report.
Future Road Construction Projects
The 2017 Bozeman Transportation Master Plan includes recommended improvement projects
for West Oak Street in the vicinity of the proposed development. These improvements include:
MSN-9, Reconstruct Oak Street from North 27th Avenue to North 19th
Avenue to a five-lane urban principal arterial standard. Estimated Cost -
$2,100,000.
TSM-2, North 27th Avenue and Oak Street geometric improvements
including installation of a traffic signal, roundabout, or other adequate
traffic control device when warrants are met. Estimated Cost- $650,000.
Abelin Traffic Services 4 July, 2018
Palisade Apartments& Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
The intersection improvement at Oak Street and North 27'Avenue are currently included in
the Cities 5-year Capital Improvement Plan for streets. This project will likely be completed
in this timeframe. The planned widening of West Oak Street to a five-lane section is not
currently on the five year plan and is not yet scheduled for construction.
Level of Service
Using the data collected for this project, ATS conducted a Level of Service(LOS) analysis at
area intersections. This evaluation was conducted in accordance with the procedures outlined
in the Transportation Research Board's Highway Capacity Manual (HCM) - Special Report
209 and the Highway Capacity Software (HCS) version 7.5. Intersections are graded from A
to F representing the average delay that a vehicle entering an intersection can expect.Typically,
a LOS of C or better is considered acceptable for peak-hour conditions.
Table 2 shows the existing 2018 LOS for the AM and PM peak hours without the traffic from
the proposed Palisade Apartments and Silver Creek Subdivision. The LOS calculations are
included in Appendix C. The table shows that most of the existing intersections along North
27`t' Avenue between Baxter Lane and Oak Street are currently operating within acceptable
limits. The intersections of Tschache Lane with North 19th Avenue and Oak Street with North
25th Avenue are also operating with an acceptable level of reserve capacity. The intersection
of North 27' Avenue with West Oak Street is currently operating at LOS D during the PM
peak hour. As traffic volumes in this area continue to increase it is likely that additional traffic
control measures will be necessary at this location as was identified in the 2017 Bozeman
Transportation Master Plan.
Table 2 -2018 Level of Service Summary
Dela
AM Peak Hour PM Peak Hour
Intersection Sec. LOS Delay Sec. LOS
N 27th Ave& Baxter Ln* 13.7/14.7 B/B 15.8/19.5 C/C
N 27th Ave & Tschache Ln** 10.5/10.4 B/B 10.7/11.3 B/B
N 27th Ave & Breeze Ln** 9.3 A 8.0 A
N 27th Ave & Cobblestone Ln** 9.1 A 9.0 A
N 27th Ave & Oak St * 14.1/16.8 B/C 34.3/32.7 D/D
N 25th Ave & Oak St* 14.5 B 14.8 B
N 19th Ave & Tschache Ln** 10.1 B 14.8 B
*North bound/Southbound Side Street LOS and Delay
"Westbound/Eastbound Side Street LOS and Delay
D. PROPOSED DEVELOPMENTS
The Palisade Development is currently under consideration for this site and includes 3.9 acres of
land located at the southeast corner of Tschache Lane and North 27'Avenue. This site would be
Abelin Traffic Services 5 July,2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
developed into 32 row-house condominiums and 42 apartment units. The project would also
include the extension of North 25t'Avenue along the east of the development from Oak Street to
Tschache Lane and the extension of Breeze Lane to the east through the development to connect
with 25t' Avenue. Access to the project would be through three approaches onto North 25t'
Avenue and a connection to Breeze Lane. Development of the property would be completed in
2020. The Palisade Apartments development plan is shown in Figure 2.
Silver Creek Subdivision is a 4.2 acre development project located at the northeast corner of
North 27°i Avenue and West Oak Street,just south of the Palisade Apartments. The development
will consist of 12 studio units, 52 one-bedroom units, 50 two-bedroom units, and 4 three-bedroom
units for a total of 118 units. The development will connect with the street network through two
access points onto North 25t' Avenue at the north and south ends of the subdivision. The
subdivision is expected to be completed in 2020.A detailed site-plan of the proposed Silver Creek
Subdivision is provided in Figure 3.
E. TRIP GENERATION AND ASSIGNMENT
ATS performed a trip generation analysis to determine the anticipated future traffic volumes from
the proposed developments using the trip generation rates contained in Trip Generation (Institute
of'Transportation Engineers, Tenth Edition). These rates are the national standard and are based
on the most current information available to planners. A vehicle "trip" is defined as any trip that
either begins or ends at the development site. ATS determined that the critical traffic impacts on
the intersections and roadways would occur during the weekday morning and evening peak hours.
According to the ITE trip generation rates, at full build-out the Palisade Development would
produce 30 AM peak hour trips, 36 PM peak hour trips, and 462 daily trips. The Silver Creek
Subdivision will produce 42 AM peak hour trips, 52 PM peak hour trips, and 642 daily trips. The
two developments combined will produce a total of 72 AM peak hour trips, 88 PM peak hour trips,
and 1,104 daily trips. See Tables 3 and 4 for detailed trip generation information.
Table 3 - Proposed Palisade A artments Pro ected Trips
AM Peak Total AM PM Peak Total PM
Hour Trip Peak Hour Trip Peak Weekday Total
Ends per Hour Trip Ends per Hour Trip Trip Ends Weekday
Land Use Units Unit Ends Unit Ends per Unit Trip Ends
Condominium 32 .46 15 .56 18 7.32 234
ITE#220
Apartment 42 .36 15 .44 18 5.44 228
ITE#221
TOTAL 30 36 462
Abelin Traffic Services 6 July, 2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Figure 2- Palisade Development Site Plan
ijit
! I
Ir
it -,
. � , j
f
C) r PALMAM APARIII KM aoxc�rvAL srr� ._
LOT SB AND LOOP= ANNM SUM M2 PL4N
rnr of WZFMAK MMrAM
Abelin Traffic Services 7 July,2018
Palisade Apartments&Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Figure 3- Silver Creek Subdivision Site Plan
8tTE It�FQ�
' ! 1 *oTiu`iiri-«ir„R,•;.>:cREs
U3ABl@ RESUNTiAL OPEN SPACE t -
! -ate.._ .0■M/{I!�� ND e u-.ZOD E`
4
0 Y►��1■! !ND i�t .ACD a
I '24IFY'.fNW - , aT00•F •a 11 •10C Af REOuIRE^-
TT CO aF OFEh t`.h p'/:RNCBC
r 4,100 Sf DOG- +RE< IY
30C 9• COY SF C Jh Tr ROOK ON IS'Ft OOR 1�.
i I ALCO,UAI-1050 Sf ISO6 QL_E FOR IAOOOQ
SOY.STf ROO'ON 1T,FLOOR
I I•
1 GO 4•C i TIL=10.$1 101 "_E FOR N0004
aC/Wy••p00�� a euE FD4 n00oR J ■,�
I 1 ( 1`�{1s��u..• \ .?:5'S�.11l Or��`�.C`F1- -_=`F�,-__
it��L11
a F
Z.I
1 Ile L it
You r_A
N Rik
I:4EEPI'!o" A2
Table 4 -Silver Creek Subdivision Projected rips
AM Peak Total AM PM Peak Total PM
Hour Trip Peak Hour Trip Peak Weekday Total
Ends per Hour Trip Ends per Hour Trip Trip Ends Weekday
Land Use Units Unit Ends Unit Ends per Unit Trip Ends
Apartment 118 .46 42 .56 52 5.44 642
ITE#220
1 L I
Other projects which were accounted for in the traffic modeling include the Bozeman West
Apartments and the West Winds Subdivision. The trip generation from these projects is shown in
Table 5. This data was obtained from the traffic impact studies prepared for each of these projects.
Abelin Traffic Services 8 July, 2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Table 5 -Additional Development Trip Generation
Total AM Peak Total PM Peak Total Weekday
Land Use Units Hour Trip Ends Hour Trip Ends Trip Ends
Bozeman West 216 104 129 1,360
Apartments
West Winds 105 54 72 689
Subdivision
TOTAL 321 158 201 2,049
F. TRIP DISTRIBUTION
The traffic distribution and assignment for the proposed subdivisions was based upon the existing
ADT volumes along the adjacent roadways and the peak-hour turning volumes. Traffic is expected
to distribute onto the surrounding road network as shown on Figure 4. The traffic from the two
residential subdivisions is expected to distribute onto the surrounding roadways in a similar
manner.
Figure 4 -Trip Distribution
0% 15%
5% Tschache Lane 5%
Proposed
Palisade
Development
0% Site
m
Breeze Lane a
a Q
K Z
N C4
N
Z Z
0% Proposed 15%
Silver Creek
Cobblestone Place Subdivision
Site
15%
W Oak Street 35%
15% 15%
Abelin Traffic Services 9 July,2018
Palisade Apartments&Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
G. TRAFFIC IMPACTS OUTSIDE OF THE DEVELOPMENT
Using the trip generation and trip distribution numbers, ATS determined the future Level of
Service for the area intersections. The anticipated intersection LOS with the Palisade Apartments
Development and Silver Creek Subdivision is shown in Table 6. The future traffic modeling
includes the projected traffic volumes from the undeveloped West Winds, and Bozeman West
Apartments as described in Section E of this report. The traffic volume calculations are included
in Appendix B of this report.
Table 5 indicates with the planned residential construction projects in this area the intersection of
North 27th with West Oak Street will function at LOS E/E. All other intersection will continue to
function at LOS A-C. The eventual need to signalize the intersection of North 27' Avenue and
Oak Street was identified in 2017 Bozeman Transportation Master Plan (TSM-2, estimated cost
$650,000) and is currently on the Cities five-year Capital Improvements Program. This
improvement would correct the LOS of the intersection of North 27a'Avenue and West Oak Street.
A theoretical traffic signal or roundabout at this intersection would function at LOS B. The traffic
signal or roundabout at this location would also provide the benefit of re-routing some traffic from
the intersection of Oak Street and 25' Avenue (which may fall of LOS D at full buildout of the
projects) to 27th Avenue therefore improving the LOS at 25th Avenue during peak-traffic
conditions. For this reason, no improvements are recommended for the 25`h Avenue intersection
if 27t'Avenue is signalized.
Table 6 —Future Level of Service Summary
AM Peak Hour PM Peak Hour
Intersection DelaySec. LOS DelaySec. LOS
N 27th Ave& Baxter Ln* 14.5/15.1 B/B 16.7/20.2 C/C
N 27th Ave & Tschache Ln** 10.6/10.3 B/B 11.1/11.7 B/B
N 27th Ave & Breeze Ln** 9.5/9.5 A/A 9.3/9.4 A/A
N 27th Ave & Cobblestone Ln** 9.2 A 9.1 A
N 27th Ave & Oak St* 17.2/21.3 C/C 43.0/45.3 E/E
N 25th Ave & Tschache Ln * 9.2 A 9.2 A
N 25th Ave & Oak St* 14.7/16.0 B/B 15.7/26.1 C/D
N 19th Ave & Tschache Ln** 11.0 B 16.0 B
'`Northbound/Southbound Side Street LOS and Delay
**Eastbound/Westbound Side Street LOS and Delay
The development of the Palisade Apartments and the West Winds Subdivision will impact traffic
conditions in this area. The City of Bozeman has plans to install a traffic signal at this location
within the next five years. However, it is likely that the Palisade Apartments, Silver Creek
Subdivision, and the other anticipated developments in this area will warrant improvements before
the projects can be completed by the City.
Abelin Traffic Services 10 July,2018
Palisade Apartments &Silver Creek Subdivision Traffic Impact Study Bozeman,Montana
Although the eastbound though lanes on Oak Street at North 27th Avenue currently extend to North
25th Avenue,the northern lane is currently designated as a turning lane for drivers turning left onto
North 27th Avenue. This lane then extends east to 25' Avenue and should be restriped to also
provide a left-turn lane for drivers turning onto North 25th Avenue towards the Palisade
Apartments until West Oak Street can be fully widened to a five-lane cross-section. The Bozeman
Transportation Master Plan identifies the widening of West Oak Street to a five-lane principle
arterial route as a Major Street Network Recommended Improvement(MSN-9).
H. LONG RANGE TRAFFIC PROJECTIONS
The City of Bozeman requires a long-range 20-year traffic projection at effected intersections to
help evaluate future traffic system needs. The 2017 Bozeman Transportation Master Plan projects
traffic conditions on roadways throughout Bozeman through 2040 and takes into account all
anticipated land development projects which are expected to occur in Bozeman over the next 20
years. The 2017 Bozeman Transportation Master Plan suggests that traffic volumes on Oak Street
and North 27th Avenue will increase by approximately 220% over the next 20 years. With the
projected 220% increase in traffic volumes along West Oak Street and North 27th Avenue, most
of the area intersections will still function at LOS B & C during the peak hours through 2038.
However, the intersection of West Oak Street and North 27th Avenue will fall to LOS F by 2038
even with a traffic signal at this location. This area will require additional widening on Oak Street
to a full five-lane section to improve capacity. With the full widening of Oak Street five-lane
cross-section the intersection of West Oak Street and North 27'Avenue will function at LOS B
through 2038. These lane and traffic control improvements will also correct any potential traffic
congestion issues at the 25t'Avenue and Oak Street intersection.
I. IMPACT SUMMARY & RECOMMENDATIONS
The construction of the Palisade Development and the Silver Creek Subdivision will affect traffic
conditions at the intersection of 27th Avenue and Oak Street.The developers should work with the
City of Bozeman to ensure that the planned traffic control improvements for the intersection of
Oak Street and 27th Avenue are completed prior to the full build-out of these two projects. The
developers should also restripe Oak Street to take advantage of the existing left-turn lane
configuration at 27th Avenue to create a similar left-turn lane at 25th Avenue. The long-term
improvements for Oak Street include widening the entire roadway to a five-lane cross-section from
25th Avenue to 19th Avenue which will be necessary to maintain traffic operations along the
corridor through 2038.
Abelin Traffic Services 11 July,2018