City of Sisters and ODOT move forward with final roundabout design
ODOT staff met with Sisters City Council, Thursday, April 14th to give an update on the US 20 @ Barclay roundabout design process. The city and ODOT are moving forward in the planning process and are working with local entities and property owners to gain input on construction staging and traffic management, aesthetics and public art for the roundabout. The design phase will continue through Winter 2016 when the project is put to bid.
Purpose of the Project
The purpose of this project is to improve safety, mobility, and access at the intersection of U.S. 20 and Barclay Drive located just west of the City of Sisters downtown area.
This proposed project, as outlined in the City of Sisters Transportation System Plan (TSP), involves designing and constructing a single-lane roundabout at the intersection of U.S. 20 and Barclay Drive and McKinney Butte Road.
Constructing a roundabout rather than a signal will reduce conflicts among vehicles, bicyclist and pedestrians while improving traffic flow for all users, including freight. It will also improve access to and from the Barclay/Locust alternate route and provide an aesthetically pleasing gateway into the City of Sisters and Central Oregon.
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Need for the Project
The performance of Highway 20 (U.S. 20/OR 126) as a corridor is one of the most significant transportation issues being faced by the City of Sisters.
According to the City of Sisters TSP adopted in January 2010, this intersection does not currently meet jurisdictional operating standards for both volume-to-capacity and safety conditions. In fact there have been recent serious crashes at the intersection and there is great concern for school related pedestrian safety.
Based on the TSP analysis, intersection failure occurs due to delays experienced by Barclay Drive traffic. In other words, delays are caused by the high volume of through traffic on U.S. 20 and the resulting lack of available gaps for Barclay Drive traffic to enter or cross the U.S. 20 traffic stream. Also a high level of truck traffic likely affects highway performance at this intersection.
The design should support one of the key focuses of the Motor Vehicle Improvement Plan in the City’s TSP. This project should be considered an initial phase for implementation of the TSP’s alternate route around downtown Sisters during peak periods of congestion.
Preferred intersection improvements at the intersection of U.S. 20 and Barclay Drive will support the Oregon Highway Plan, by including the following considerations:
- Geometric design for serving and accommodating truck traffic;
- Cost comparisons of traffic signal versus roundabout, including construction and operations/maintenance;
- Economic and business viability, especially during construction;
- Safety and access of pedestrian crossings;
- Safety and access of bicycle movements;
- Potential for motor vehicle queuing from downtown to extend into the roundabout
- Intersection capacity, including potential alternative measures of congestion and mobility
- Construction phasing including consideration of interim improvements transitioning to the long-term decision for signal or roundabout;
- Compliance with the American with Disabilities Act; and
- Storm water quantity and quality
Development of the right solution at this intersection will require close coordination with the freight industry. ODOT and the City gained support from the
freight industry for the roundabout design sizing, through the statewide Motor
Carriers Transportation Advisory Committee (MCTAC) on April 9, 2015.
The City of Sisters, with the cooperation of ODOT, has done a great deal of public involvement, planning and preliminary design for a roundabout at U.S. 20 and Barclay Drive. The City has indicated that their strong preference is for a roundabout at this intersection as a long-term solution. They have secured funding for a roundabout through the Central Oregon Area Commission on Transportation, and together ODOT and the City are working on a proposed design.
ODOT and the City continue to hear from stakeholders regarding this proposed project. The proposed design is slated for construction in late 2016.
Funding and Schedule