Close Calls at Michigan’s Dams Are a Climate Warning to America

Why It Matters

Aging dams amplify flood damage, threaten lives and ecosystems, and demand urgent investment and policy action as climate‑intensified storms become the new norm.

Key Takeaways

• Michigan floods left Cheboygan Dam within 5 inches of overtopping
• Over 50% of state dams exceed 50‑year design life
• U.S. dam rehab costs estimated above $165 billion, $1 billion for Michigan
• Dam removals, like Union Street, reduce flood risk and restore ecosystems
• Proposed Michigan bill would tighten inspections and fund upgrades/removals

Pulse Analysis

The United States faces a hidden climate threat: a aging dam fleet built for a milder past. With an average age of 64 years, most structures were designed for rainfall patterns that no longer exist. In Michigan, more than half of the 1,000 state‑regulated dams have outlived their 50‑year design life, and the nation’s 92,000 dams include 18% classified as high‑hazard. The recent northern Michigan floods, which brought the Cheboygan Dam within five inches of overtopping, illustrate how intensified snowmelt and rain can turn these relics into ticking time bombs. The estimated $165 billion needed for nationwide rehabilitation—about $1 billion for Michigan alone—highlights the scale of the challenge.

Communities are turning to dam removal as a cost‑effective, environmentally beneficial alternative to costly upgrades. The Union Street Dam removal in Traverse City, part of a multi‑million‑dollar river restoration, helped keep upstream water levels two feet lower during near‑500‑year flood conditions, demonstrating tangible flood mitigation benefits. Similar projects, such as the $25 million Boardman‑Ottaway River removal and the upcoming $4 million Sanback Dam dismantling, showcase how strategic decommissioning can restore river ecosystems, improve fish passage, and eliminate ongoing maintenance expenses. However, removal decisions often clash with local economic interests tied to reservoirs and hydroelectric generation, requiring nuanced stakeholder engagement.

Policy response is now critical. Michigan’s proposed legislation aims to tighten inspection protocols, address private ownership gaps, update design standards, and create new funding streams for upgrades or removals. While federal programs through FEMA and the Army Corps of Engineers provide some assistance, they cover only a fraction of the $165 billion shortfall and face potential budget cuts. Strengthening state oversight—currently covering roughly 70% of U.S. dams—and securing reliable financing will be essential to prevent future near‑disasters. As climate models predict more frequent, intense storms, proactive dam safety reforms will be a cornerstone of resilient infrastructure planning across the country.