U-M Diag Upgrades: New Walkways, Better Drainage, and Accessibility

Construction on the Diag enhances U-M's spaces with new pavers, improved drainage, and an ADA ramp at Hatcher Library.

August 26, 2025

As the fall semester commences, the University of Michigan community is greeted by visible construction on the Diag, aiming to enhance the campus experience. This major project focuses on three key areas: upgrading brick pavers, preserving green spaces, and adding ADA-accessible features. These improvements reflect the university’s commitment to a safe and inviting environment for students and faculty.

The project entails installing new brick pavers, ensuring the preservation of the iconic Block M. Enhancements to drainage systems and tree health are also prioritized, maintaining the beauty and sustainability of campus green spaces. Additionally, a new ADA-accessible ramp is being constructed on the east side of Hatcher Library, promoting inclusivity and ease of access for everyone.

MORE INFORMATION

For project details and updates, visit the AEC projects page or contact avpfo@umich.edu

Currently, the renovation work, including brick paver replacement and tree improvements, is expected to wrap up by mid-September.

A construction worker uses a tool to blast sand and dirt — Custodial and Grounds Services staff used Air Spading to guide catch basin placement and protect trees By mapping major root structures first they minimized disturbance and later enriched the soil with a sand and compost blend to support healthy growth Courtesy of Facilities Operations

Keeping the Diag’s Walkways Strong

New brick pavers are being laid to enhance the frequently used walkways, ensuring they remain safe and smooth. This upgrade also preserves the iconic Block M, a central feature of the Diag.

Improving Drainage and Tree Health

Focus is also on enhancing drainage and promoting tree health. Poor drainage previously led to puddles or ice, necessitating excessive salt use, which harmed soil and trees. Heavy foot traffic compacted the soil, limiting water and oxygen for roots.

Instead of traditional stormwater systems, U-M’s teams employ innovative methods to protect trees while enhancing community safety:

Air spading to safely expose roots and loosen compacted soil.

Using sand-and-compost blends to support roots, with earthworms introduced for natural aeration.

Installing catch basins for stormwater infiltration, diverting it from storm pipes.

Adjusting sidewalks to channel water into basins, using lighter equipment to avoid further compaction.

Sidewalks around the DIag at U-M have been raised to assist with drainage — Sidewalks with poor drainage were reconstructed at a higher elevation with a gentle slope to direct water toward catch basins Courtesy of Facilities Operations

Opening Doors for Everyone

An ADA-accessible ramp on Hatcher Library’s east side is being added, enhancing accessibility for all, including those with mobility challenges. This addition ensures that the busy Diag is welcoming and navigable for everyone.

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