Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

Name	Jurisdiction of Incorporation
Great Lakes Dredge & Dock Company, LLC	Delaware
Great Lakes U.S. Fleet Management, LLC	Delaware
Great Lakes Dredge & Dock Environmental, Inc. (merged into Great Lakes Environmental & Infrastructure Solutions, LLC on December 31, 2019)	Delaware
Great Lakes Dredge & Dock Australia Pty Ltd (deregistered on July 7, 2019)	Australia
Great Lakes Dredge & Dock do Brasil Ltda.	Brazil
Great Lakes Dredge & Dock India Private Limited	India
Great Lakes Dredge & Dock (Bahamas) Ltd.	Bahamas
GLDD Mexicana, S. de R.L. DE C.V.	Mexico
NASDI Holdings, LLC	Delaware
Great Lakes Environmental & Infrastructure, LLC (sold on June 1, 2019; formerly Magnus Pacific, LLC and formerly Magnus Pacific Corporation acquired November 4, 2014)	Delaware
Great Lakes Environmental & Infrastructure Solutions, LLC	Delaware
Terra Contracting Services, LLC	Delaware
Terra Fluid Management, LLC	Delaware
Drews Services LLC	South Carolina