Merced Avenue Greenway Project: A Model for Future Urban Street Retrofits

Introduction.
The Merced Avenue Greenway Project is a transformative planning, design, and construction initiative focused on revitalizing a 1.1-mile urban corridor in the City of South El Monte, California. This stretch of Merced Avenue has long suffered from challenges including inadequate stormwater management, recurring flood risks, limited green spaces, and a lack of safe, accessible pedestrian and bike pathways. These issues have not only impacted water quality and urban sustainability but have also contributed to the area's vulnerability to climate change effects such as extreme heat and storm events.

The project was initiated as a response to these pressing environmental and community challenges, with a commitment to align with the goals of the Upper Los Angeles River Watershed Enhanced Watershed Management Program (ULAR EWMP). The ULAR EWMP prioritizes water quality improvement through the integration of climate-resilient stormwater infrastructure and green street designs. Recognizing the need for a holistic approach, the Merced Avenue Greenway Project incorporates strategies for stormwater capture and infiltration, vegetative habitat restoration, and enhanced mobility for pedestrians and cyclists.

The work includes the implementation of innovative stormwater Best Management Practices (BMPs) such as bioswales, permeable pavements, and rain gardens. Additionally, the project prioritizes urban greening efforts, with tree planting and native vegetation to reduce the urban heat island effect and support biodiversity. Community engagement has been a cornerstone of this project, with outreach programs designed to educate residents and foster their involvement in shaping the project outcomes.

This pilot effort aims to establish a replicable model for green street retrofits, addressing not only the immediate needs of Merced Avenue but also setting a precedent for sustainable urban design in similar communities. The outcomes of this initiative are expected to include improved stormwater management, enhanced water quality, increased community resilience to climate change, and a more livable urban environment.

Objectives.
To decrease flood risk, increase vegetative cover, restore habitat, improve active transportation, and reduce urban heat island effects.

Status.
The southern portion of the project is nearing construction completion. The northern portion of the project is currently in the planning and design phase, with a strong emphasis on community outreach and education.

Methodology.
The project leverages the Upper Los Angeles River Watershed Enhanced Watershed Management Program (ULAR EWMP) to implement climate-resilient stormwater BMPs and urban greening elements.

Findings.
The project will serve as a pilot for developing green street design standards and contribute to water quality improvement strategies in Los Angeles County.

Significance/Conclusion.
This initiative exemplifies an integrated approach to urban street retrofits, blending infrastructure improvements with community and environmental benefits.