ACHD Comments PZDate: October 9, 2014
To: Sonya Watters, Associate City Planner
City of Meridian
33 E. Broadway Avenue
Meridian, ID 83642
John S. Franden, President
Mitchell A. Jaurena, Vice President
Rebecca W. Arnold, Commissioner
Sara M. Baker, Commissioner
Jim D. Hansen, Commissioner
Subject: Hill's Century Farm Subdivision/MPP14-0018/AZ14-012/PP14-014
5340 S. Eagle Road
Sonya,
Thank you for the opportunity to review and provide comments on the annexation, rezone, and
preliminary plat application for Hill's Century Farm Subdivision, located at 5340 S. Eagle Road.
ACHD staff is currently working to complete the staff report, as a review of the traffic impact study
submitted on September 24, 2014 has been completed and recommends that you move forward with
the Planning and Zoning Commission meeting scheduled on October 16, 2014. A draft ACHD staff
report will be available prior to the Planning and Zoning Commission meeting.
Below is a summary of the trip generation, ACHD's concerns with the site plan, and the executive
summary from the traffic impact study.
Please let me know if you have any questions.
Sincerely,
Mindy Wallace, AICP
Planner III
Development Services
CC: Project file,
Mike Wardle — Brighton Corporation
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208-387-6100 • FX 345-7650 • www.achdidaho.org
Trip Generation:
This development is planned to be construct over a 10 year period, with 3 phases:
Site Plan:
ACHD is generally supportive of the proposed lay out of the development. Staff will be
recommending that the collector roadway proposed to stub to the future school parcel be redesigned
to stub to the north; consistent with the Master Street Map (MSM).
Consistent with ACHD's Access Management and Roadway Offset policies, which allow for public
streets to intersect principal arterial roadways, such as Eagle Road, at the half mile. Staff will be
recommending that the segment of Lachlan Street which is proposed to intersect Eagle Road be
constructed as a temporary access until 2 points of ingress and egress have been constructed
meeting Meridian Fire Department Standards.
The submitted traffic impact study recommends the installation of a either a roundabout or a signal at
the Eagle Road/Taconic intersection. To ensure there is sufficient right-of-way to accommodate the
construction of either improvement in the future staff will be recommending that additional right-of-
way be dedicated at the intersection to allow for future construction of a single lane roundabout; a
signal would also fit within the roundabout right-of-way.
Traffic Impact Study:
Horrocks Engineering prepared a traffic impact study for the proposed Hill's Century Farm. Below is
an executive summary of the findings as presented by Horrocks Engineering. The following
executive summary is not the opinion of ACHD staff.
Report Summary
This study was prepared with the Ada County Highway District's (ACHD's) requirements for Traffic
Impact studies listed in Section 7106 of the current ACHD Policy Manual. It evaluates the traffic
impacts generated by the proposed Hill's Century Farm Subdivision. The study's principal findings
and recommendations are summarized below.
Propose Development
Hill's Century Farm Subdivision is a proposed 224 acre single-family development located within the
Meridian City limits in Ada County. The planned land uses in the development consist of:
675 single family detached residential dwelling units
The development is planned to be constructed over a 10 -year period, with three phases:
Phase 1 constructs 212 single-family detached residential dwelling units by 2018
Phase 2 constructs 251 additional single-family detached residential dwelling units by 2022
Phase 3 construction of the remained of the development (build -out) is planned by 2025
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208-387-6100 • FX 345-7650 • www.achdidaho.org
Five accesses for the development are proposed to be connected to existing streets. There are five
other accesses that will connect to future adjacent developments that are not yet planned. Traffic
was distributed to the follow three project accesses:
• Eagle Road/E. Taconic Road
• S. Newbridge Avenue/Lake Hazel Road
• Eagle Road/E. Lachlan Boulevard
The off-site study intersections include:
• Eagle/Amity Road (Roundabout)
• Eagle/Lake Hazel Road (Unsignalized)
• Locust Grove/Amity (Unsignalized)
Study area roadway segments:
• Eagle Road, from Victory Road to Lake Hazel Road (Principal Arterial)
• Amity Road, from Eagle Road to Locust Grove (Minor Arterial)
• East Taconic Road, from Eagle into project (Collector)
• South Newbridge, from Lake Hazel into project (Collector)
Proposed Roadway/Intersection Improvements for Existing Traffic
Roadways: Under the existing traffic conditions, using the existing roadway lane configurations, all
study area roadways meet ACHD's minimum operational thresholds. No roadway improvements are
needed to mitigate the existing traffic.
Intersections: For the existing intersection traffic conditions analyzed using the existing intersection
control and lane configuration, all study are intersections meet ACHD's minimum operational
thresholds. No intersection improvements are needed to mitigate the existing traffic.
ACHD's Planned Improvements
Years 2017-2021: reconstruct the Amity Road and Locust Grove Road intersection to a dual -lane
roundabout.
Years 2022-2026: widen Amity Road from Locust Grove Road to Eagle Road to 5 -lanes.
Years 2022-2026: widen Eagle Road from Lake Hazel Road to Amity Road to 5 -lanes.
Years 2022-2026: reconstruct the Amity Road and Eagle Road intersection to a dual -lane
roundabout.
Years 2022-2026: widen Eagle Road from Amity Road to Victory Road 5 -lanes
2018 (Phase 1) Background Traffic
Roadways: Eagle Road north of Amity Road will need a two-way left turn lane (TWLT) prior to
adding project traffic to the road network.
Intersections: No intersections need to be improved for this phase.
Turn Lane Analysis: No additional turn lanes needed.
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208-387-6100 • FX 345-7650 • www.achdidaho.org
2018 (Phase 1) Site Plus Background Traffic Conditions
Roadways/Intersections: No additional improvements needed to maintain acceptable operating
levels of service at roadways or intersections.
Turn Lane Analysis: The southbound left and southbound right turning movements from Eagle
Road to Taconic Drive merit separate turning lanes
2022 (Phase 2) Background Traffic Conditions
Roadways/Intersections: No additional improvements needed to maintain acceptable operating levels of
service at roadways or intersections.
Turn Lane Analysis: The southbound left turning movement from Eagle Road to Lachlan Boulevard merits a
separate turning lane.
2022 (Phase 2) Site Plus Background Traffic Conditions
Roadways: Eagle Road (north of Amity Road) will need to be increased to two lanes in each direction. This is in
addition to the TWLTL recommended under the 2018 Background traffic conditions. Eagle Road (between Amity
Road and E. Taconic Drive) will need median control/channelized left tum lanes at major intersections.
Intersections: Eagle Road/Amity Road roundabout will need a northbound right tum lane to eastbound
Amity Road.
Turn Lane Analysis: No additional turn lanes needed.
2025 (Build -Out) Background Traffic Conditions
Roadways: There are no roadways that will need improvements for this phase.
Intersections: Eagle Road/Amity Road intersection will need to be a dual lane roundabout. Eagle Road/E.
Taconic Drive intersection will need to be a roundabout or signalized intersection
Turn Lane Analysis: No additional turn lanes needed.
2025 (Build -Out) Site Plus Background Traffic Conditions
Roadways/Intersections: No additional improvements needed to maintain acceptable operating levels of
service at roadways or intersections.
Turn Lane Analysis: The northbound right turning movement from Eagle Road to Taconic Drive merits a
separate turning lane
Ada County Highway District • 3775 Adams Street • Garden City, ID • 83714 • PH 208-387-6100 • FX 345-7650 • www.achdidaho.org