HomeMy WebLinkAbout011.02 - Appendix J.3 - Intersection Deviation Letter•
• Engineers and Land Surveyors
851 Bridger Drive, Suite 1, Bozeman, MT 59715 | phone: 406-522-8594
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1
February 14, 2025
Cody Flammond, PE
City of Bozeman Engineering Division
RE: Stockyard Site Minimum Horizontal Curve Radius and Tangent Length at Intersection
Design Standard Deviation
Cody:
The purpose of this letter is to request deviations from City of Bozeman Design Standards regarding
minimum horizontal curve radii and minimum horizontal tangent lengths near intersections.
As noted in the Infrastructure Review, the proposed intersection of Stockyard Way (referred to as
Huyser Dr. in our previous submittal) with Hillside Lane does not meet the standards set forth in
The City of Bozeman Design Standards & Specifications - Table IV-2.
We believe the proposed arrangement is the safest and most efficient way to connect these two
streets. Without the curves proposed, the existing alignment of Hillside Ln. and the alignment of
Stockyard Way as proposed with the upcoming Story Mill Community Park – East Parking Lot
Project will intersect at an angle of 49 degrees. This will result in limited sight distance for those
turning onto Stockyard Way off of Hillside Ln. This will also result in a difficult turning movement for
those travelling north on Stockyard Way turning East onto Hillside Ln.
The proposed plan is to re-align Hillside Ln. to intersect Stockyard Way at 90 degrees. This
arrangement yields the greatest sight distances and turning radii for all travel directions. This
arrangement also maximizes parking availability along Stockyard Way in the Story Mill Community
Park property.
The 100-foot radius was proposed on Hillside Ln. in lieu of a 150-foot radius to encourage lower
speeds and provide traffic calming. The 150-foot radius specified in the Design Standards applies to
all locations on local streets. Given this instance is at the approach to a stop-controlled intersection,
traffic speed will be greatly reduced in the vicinity of the proposed curve making the 100-foot radius
curve safer and more comfortable for drivers. The 100-foot radius also preserves the existing
alignment of Blue Silos Way as the standard 150-foot radius would require an extension of Blue
Silos Way.
Our design team believes the proposed solutions mentioned above will have no adverse affect on
the health, safety, and welfare of the public.
Please let us know if you have any additional questions.
Stahly Engineering & Associates
William L. Newman, PE
Project Engineer 02/14/2025