Great Lakes Dredge & Dock Corporation Declares Quarterly Cash Dividend

OAK BROOK, Ill.--(Business Wire)--
Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD) - announced today that its
Board of Directors ("the Board") has declared a quarterly cash dividend on its
common stock. The Board approved a $0.017 per share cash dividend, to be paid on
June 19, 2009 to the holders of record of common stock of the Company at the
close of business on June 11, 2009.

Great Lakes Dredge & Dock Corporation is the largest provider of dredging
services in the United States and the only U.S. dredging company with
significant international operations, averaging 30% of its dredging revenues
over the last three years. The Company is also one of the largest U.S. providers
of commercial and industrial demolition services. Additionally, the Company owns
a 50% interest in a marine sand mining operation in New Jersey which supplies
sand and aggregate used for road and building construction. Great Lakes has a
119-year history of never failing to complete a marine project and owns the
largest and most diverse fleet in the U.S. industry, comprised of over 180
specialized vessels.

Cautionary Note Regarding Forward-Looking Statements

Certain statements in this press release may constitute "forward-looking"
statements as defined in Section 27A of the Securities Act of 1933 (the
"Securities Act"), Section 21E of the Securities Exchange Act of 1934 (the
"Exchange Act"), the Private Securities Litigation Reform Act of 1995 (the
"PSLRA") or in releases made by the Securities and Exchange Commission ("SEC"),
all as may be amended from time to time. Such forward-looking statements involve
known and unknown risks, uncertainties and other important factors that could
cause the actual results, performance or achievements of Great Lakes and its
subsidiaries, or industry results, to differ materially from any future results,
performance or achievements expressed or implied by such forward-looking
statements. Forward-looking statements can be identified by, among other things,
the use of forward-looking language, such as the words "plan," "believe,"
"expect," "anticipate," "intend," "estimate," "project," "may," "will," "would,"
"could," "should," "seeks," or "scheduled to," or other similar words or
comparable language, or by discussion of strategy or intentions. These
cautionary statements are being made pursuant to the Securities Act, the
Exchange Act and the PSLRA with the intention of obtaining the benefits of the
"safe harbor" provisions of such laws. Great Lakes cautions that actual results
may differ materially from those contained in any forward-looking statements
herein, including, but not limited to, as a result of the factors, risks and
uncertainties described in other securities filings of Great Lakes with the SEC,
such as its most recent Annual Report on Form 10-K. You should not place undue
reliance on these forward looking statements. The forward-looking statements
contained in this press release are made only as of the date hereof and Great
Lakes does not have or undertake any obligation to update or revise any
forward-looking statements whether as a result of new information, subsequent
events or otherwise, unless otherwise required by law. All forward-looking
statements are qualified in their entirety by this cautionary statement.

Great Lakes Dredge & Dock Corporation
Deborah A. Wensel, Chief Financial Officer
630-574-3772

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