HomeMy WebLinkAbout32A_Roadway Width Memo_2024-1002
520 Kirkland Way, Suite 100, Kirkland, WA 98033
(425) 889-6747 www.tenw.com
MEMORANDUM
DATE: October 2, 2024
TO: Cristina Haworth, AICP
Jefferson County
FROM: Michael Read, PE
TENW
SUBJECT: Minimum Roadway Width – Response to SUB2023-00025 Technical Review Comments
Pleasant Harbor Master Planned Resort
TENW Project No. 2901
This memorandum summarizes the roadway width requirements for the Pleasant Harbor Master Planned
Resort project in response to the August 16, 2024 comments from Jefferson County that TENW received
on September 12, 2024. The project proposes several roadway sections that meet the minimum
requirements as outlined in the 2018 International Fire Code (IFC) and the Jefferson County Code (JCC).
Overview of Design Context
The Jefferson County Code (JCC) Title 18 Unified Code Development, Chapter 18.30 Development
Standards, Section 18.30.080 Roads adopts the American Association of State Highway and
Transportation Officials (AASHTO), A Policy on Geometric Design of Highways and Streets. P er the AASHTO
A Policy on Geometric Design of Highways and Streets, Section 5.2.2 Cross-Sectional Elements, Table 5-5,
Minimum Width of Traveled Way and Shoulders for Two-Lane Local Roads in Rural Areas, the minimum
width of traveled way for a volume of 400 to 2,000 vehicles per day (vpd) and a design speed of 15 to 25
MPH is 20 feet. Table 5-5 is included in Attachment A. Jefferson County code does not adopt any other
roadway references to alternative geometric standards that require wider dimensions.
Per the 2018 International Fire Code, Chapter 5 Fire Service Features, Section 503 Fire Apparatus Access
Roads, subsection 503.2.1 Dimensions:
Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (6096 mm),
exclusive of shoulders, except for approved security gates in accordance with Section 503.6, and
unobstructed vertical clearance of not less than 13 feet 6 inches.
For internal circulation and to provide access to community amenities and residences, the project
proposes to construct several internal roadways with varying sections. The proposed roadway sections
for the internal roadways are shown in Attachment B. The roadway sections vary depending on
anticipated use, with traveled way ranging from 20 feet to 24 feet. The posted speed of the interior
private roadways at the project are all proposed to be 20 MPH.
The design of the proposed roadways was based on multiple factors in addition to the minimum
roadway width standards described above. These private local roads are intended to be low speed,
neighborhood resort roadways. Therefore, the roadway widths provide additional traffic calming
measures to achieve this intent. In addition, the roadway design minimizes stormwater generating
surfaces to assist with achieving the mitigation requirement stormwater treatment on-site. Lastly, the
Exhibit 32A
Minimum Roadway Width Memo
Pleasant Harbor Master Planned Resort (Jefferson County)
October 2, 2024
Page 2
proposed design helps to achieve the mitigation requirements to blend with the natural setting and
improves the ability to preserve trees and other existing natural landscape features.
Conclusion
As demonstrated in our review, the 2018 International Fire Code and A Policy on Geometric Design of
Highways and Streets were considered in determining the minimum roadway width required for the
Pleasant Harbor Master Planned Resort project. As demonstrated, these criteria would be met or
exceeded with the proposed roadway sections provided in Attachment B. The proposed roadway widths
provide additional benefits to the Pleasant Harbor development including traffic calming/speed control,
stormwater management, and native vegetation preservation.
Please contact me at (206) 361-7333 x 101 or mikeread@tenw.com with any questions.
Attachments
Attachment A – AASHTO – A Policy on Geometric Design of Highways and Streets, Table 5-5
Attachment B – Proposed Site Plan and Roadway Sections
Exhibit 32A
Minimum Roadway Width Memo
Pleasant Harbor Master Planned Resort (Jefferson County)
ATTACHMENT A
AASHTO A Policy on Geometric Design of Highways and
Streets, Table 5-5
Exhibit 32A
Exhibit 32A
Minimum Roadway Width Memo
Pleasant Harbor Master Planned Resort (Jefferson County)
ATTACHMENT B
Proposed Site Plan and Roadway Sections
Exhibit 32A
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