Sweden is often identified as one of the countries where implementation of Agenda 2030 and the Sustainable Development goals (SDGs) is high. There is still, however, considerable room for improvements, especially considering the mitigation of climate change, and in addition, the reinterpretation of Agenda 2030 and the SDGs have been proven challenging in Swedish sustainability governance. Infrastructure, responsible for approximately 80%, has been identified as an area where strategies for climate change mitigation are likely to have a significant impact. Simultaneously, infrastructure development has been identified as key in driving human development and fulfilling Agenda 2030 and the SDGs. As sustainable infrastructure is becoming increasingly important, understanding what constitutes sustainable infrastructure is essential. Using a case study approach, this study explores the conceptualization and integration of sustainability in Sweden, explicitly focusing on road culvert replacements in northern Sweden. The findings reveal a lack of a shared understanding of what constitutes sustainable transport infrastructure but show a partially shared understanding of what constitutes sustainable road culvert replacement practices. The analysis highlights challenges faced by public organizations in implementing sustainability and emphasizes the importance of stakeholder collaboration and knowledge exchange. This research provides insights into strategies for integrating sustainability into road culvert replacements and highlights the importance of stakeholder collaboration for sustainable outcomes, contributing to future sustainable infrastructure development.