Exhibit 21.1

LIST OF SUBSIDIARIES

Name of subsidiary	Jurisdiction of Formation	Effective Ownership
Orion Administrative Services, Inc.	Texas	Orion Marine Group, Inc.	100%
OCLP, LLC	Nevada	Orion Marine Group, Inc.	100%
OCGP, LLC	Texas	OCLP, LLC	100%
Orion Construction, LP	Texas	OCLP, LLC	99%
		OCGP, LLC	1%
Orion Marine Construction, Inc.	Florida	Orion Construction, LP	100%
Orion Industrial Construction, LLC f/k/a	Louisiana	Orion Marine Group, Inc.	100%
F. Miller Construction, LLC
Orion Marine Contractors, Inc.	Delaware	Orion Marine Group, Inc.	100%
Northwest Marine Construction, ULC	Canada	Orion Marine Contractors, Inc.	100%
Schneider E&C Company, Inc.	Florida	Orion Marine Group, Inc.	100%
SSL South, LLC	Florida	Orion Marine Construction, Inc.	100%
Industrial Channel and Dock Company	Texas	Orion Marine Construction, Inc.	100%
Commercial Channel and Dock Company	Texas	Orion Marine Construction, Inc.	100%
Orion Concrete Construction, LLC	Delaware	Orion Marine Group, Inc.	100%
East & West Jones Placement Areas, LLC	Delaware	Orion Administrative Services, Inc.	100%
Preferred Tool Services, Inc.	Texas	Orion Administrative Services, Inc.	100%
Orion Marine Group, LLC	Texas	Orion Administrative Services, Inc.	100%
Kingfisher Marine Services, LLC	Texas	Orion Marine Construction, Inc.	100%
Misener Marine Construction, Inc.	Georgia	Orion Marine Construction, Inc.	100%
T. LaQuay Dredging, LLC	Texas	Orion Marine Construction, Inc.	100%
Orion Contractors Australia Pty Ltd	Australia	Orion Marine Contractors, Inc.	100%

Orion Marine de Mexico, S de RL de CV	Mexico	Orion Marine Construction, Inc.	99%
		Orion Administrative Services, Inc.	1%
OM Marine Services de Mexico, S de RL de CV	Mexico	SSL South, LLC	99%
		Orion Industrial Construction, LLC f/k/a	1%
		F. Miller Construction, LLC
Orion Marine Construction TCI, Ltd	Turks and Caicos	Orion Marine Construction, Inc.	100%
T.A.S. Commercial Concrete Construction, LLC	Delaware	Orion Concrete Construction, LLC	100%
Tony Bagliore Concrete, Inc.	Texas	T.A.S. Commercial Concrete, LLC	100%
T.A.S. Proco, LLC	Texas	Orion Concrete Construction, LLC	1%
		T.A.S. Commercial Concrete, LLC	99%
Orion Corporate Services, LLC	Texas	Orion Marine Group, Inc.	100%
T.A.S. Commercial Concrete Solutions, LLC	Texas	Orion Concrete Construction, LLC	100%
Orion Government Services, LLC	Washington	Orion Marine Construction, Inc.	50%
		Orion Construction, LP	50%