EXHIBIT 99.1 Great Lakes Reports First Quarter 2024 Results First quarter net income of $21.0 million First quarter adjusted EBITDA of$42.9 million Dredging backlog of $879.4 million at March 31, 2024 HOUSTON, May 07, 2024 (GLOBE NEWSWIRE) -- Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today reported financial results for the first quarter ended March 31, 2024. First Quarter 2024 Highlights Revenue wa ...