Great Lakes Dredge & Dock Corporation Schedules Announcement for 2013 Second Quarter Results

  Great Lakes Dredge & Dock Corporation Schedules Announcement for 2013 Second
  Quarter Results

Business Wire

OAK BROOK, Ill. -- August 5, 2013

Great Lakes Dredge & Dock Corporation (NASDAQ: GLDD) today announced that it
will release its financial results for the three and six months ended June 30,
2013 on Thursday, August 8, 2013 at 7:00 a.m. C.D.T. A conference call with
the Company will be held the same day at 9:00 a.m. C.D.T. The call in number
is 877-377-7553 and Conference ID is 20061209. The conference call will be
available by replay until Monday, August 12, 2013, by calling 800-585-8367 and
providing Conference ID 20061209. The live call and replay can also be heard
on the Company’s website, www.gldd.com, under Events & Presentations on the
investor relations page. A copy of the press release will be available on the
Company’s website.

The Company

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. The Company is also one of the largest
U.S. providers of commercial and industrial demolition and remediation
services primarily in the Northeast and Midwest. The Company owns a 50%
interest in a marine sand mining operation in New Jersey that supplies sand
and aggregate for road and building construction and a 50% interest in an
environmental service operation with the ability to remediate soil and dredged
sediment treatment. Great Lakes employs over 150 degreed engineers, most
specializing in civil and mechanical engineering, which contributes to its
123-year history of never failing to complete a marine project. Great Lakes
has a disciplined training program for engineers that ensures
experienced-based performance as they advance through Company operations.
Great Lakes also owns and operates the largest and most diverse fleet in the
U.S. industry, comprised of over 200 specialized vessels.

Contact:

Great Lakes Dredge & Dock Corporation
Katie Hayes, Director of Investor Relations, 630-574-3012