Study Warns 10th Avenue Elevated Alignment Would Be “Globally Unprecedented”
A new study by transit researcher Dr. Willem Klumpenhouwer concludes that a 10th Avenue elevated alignment would be “globally unprecedented,” a finding the local Business Improvement Association says must be addressed before planning and design proceed. The report flags narrow corridor geometry and a range of engineering, community and business concerns tied to an elevated guideway through the 10th Avenue corridor. City officials and stakeholders are being urged to consider the study’s recommendations before committing to detailed design or procurement.
Study authorship and mandate
The study was authored by transit researcher Dr. Willem Klumpenhouwer and commissioned to evaluate the feasibility of an elevated transit alignment along 10th Avenue. It focuses on corridor width, structural requirements and the interaction between elevated infrastructure and adjacent land uses. The Business Improvement Association has cited the study in calling for the issues identified to be resolved before project planning and design move forward.
Main finding that alignment would be unprecedented
Klumpenhouwer’s principal conclusion is that an elevated alignment through the narrow 10th Avenue corridor would be without clear international precedent. The study describes the combination of a restricted right-of-way and dense commercial and residential frontage as creating design constraints rarely encountered elsewhere. As a result, the report warns that standard elevated transit solutions may not be directly transferable and will require bespoke engineering and urban design responses.
Engineering challenges tied to corridor geometry
The study highlights several technical challenges inherent to a narrow corridor elevated alignment, including support-column placement, foundation constraints and clearance requirements for road users and buildings. Structural spans would need to balance minimal footprint with adequate load-bearing capacity, complicating both design and construction sequencing. The report also raises concerns about construction staging, temporary traffic impacts and the need for specialized foundations where underground services and shallow utilities are present.
Implications for businesses and public realm
Local business groups emphasize the potential impacts on storefront access, deliveries and streetscape character during both construction and operation. The Business Improvement Association has pointed to the need for mitigation measures to protect small businesses and to preserve pedestrian activity along 10th Avenue. The study calls for early, formalized engagement with affected property owners and a detailed assessment of economic and visual impacts as part of any further planning.
Comparisons and lack of direct precedents
Klumpenhouwer’s report compares the 10th Avenue scenario to elevated transit cases in other cities and finds limited analogues where highly constrained mixed-use corridors were used for full-length elevated alignments. Where precedents exist, they frequently involve wider rights-of-way, dedicated median space or extensive property acquisition. The absence of a straightforward precedent increases uncertainty around construction risk, cost escalation and long-term maintenance obligations, the study notes.
Alternatives and design options urged before commitment
The study recommends that alternatives to a continuous elevated alignment be fully evaluated before the project advances to detailed design. Options identified for further study include at-grade alignments, partial tunnelling, short elevated segments combined with at-grade transitions, and route realignments that use wider corridors. The report stresses that selecting a technically viable and community-acceptable option will require comparative analysis of capital and operating costs, construction impacts and long-term urban design outcomes.
Next steps called for by the BIA and researcher
Both the Business Improvement Association and Dr. Klumpenhouwer urge that the study’s considerations be incorporated into the project’s next phase and used to inform procurement and design brief documents. They recommend expanded technical studies, independent peer review and transparent stakeholder consultations to validate assumptions and identify mitigation strategies. The study also calls for risk-sharing approaches in contracting to address the heightened uncertainty associated with a unique elevated solution.
The study’s findings arrive as municipal planners prepare to advance transit planning decisions that will shape 10th Avenue for decades, and they underscore the tension between delivering rapid transit and protecting existing urban form. The BIA has made clear that unresolved design, economic and visual impacts on the corridor should preclude any commitment to an elevated alignment until further evidence is produced.
