Experience That Runs Deep

Serving the Mid-Atlantic since 1991 with integrity, innovation, and care.
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Why Choose Us

 
30
30 Years of Experience

Proven experience with a nationwide reach.
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Licensed & Trusted

We follow strict compliance standards
from OSHA, EPA, and state authorities
in all operations.
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Modern Fleet

With one of the most advanced
and responsive drilling fleets,
we handle jobs of any size and terrain.

Our Core Services
 

Our Equipment

We operate one of the most diverse and advanced drilling fleets in the Mid-Atlantic, suitable for both remote and urban drilling environments.


Featured Projects

Connelly sonic 3 1 5

As part of the preliminary geotechnical investigations for the replacement of the Francis Scott Key Bridge, our team successfully completed a critical subsurface exploration program along the Patapsco River in Baltimore, Maryland.
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As part of an environmental remedial investigation for the Florida Department of Environmental Protection (FDEP), our firm successfully executed its first Direct Push Technology (DPT) drilling project in Florida. This milestone effort was conducted at the Co-Ops Fuels & Lubricants site in Gulfport, utilizing our newly acquired Geoprobe® 3216GT.
Cbbt grouting project

Our team was engaged to support an emergency geo-stabilization effort on the Chesapeake Bay Bridge-Tunnel (CBBT), a 13-mile transportation corridor composed of a series of bridges and tunnels connecting Virginia Beach to the Eastern Shore. The project, which expands the capacity of U.S. Route 13, was nearing completion when a tunnel boring machine (TBM) encountered unstable ground conditions, halting progress on a critical segment of the tunnel.
 
Mt. storm

This was a large-scale geotechnical drilling project in support of a proposed wind farm development along an eastern ridge of the Allegheny Mountains near Mount Storm, West Virginia. The project involved the replacement and installation of wind turbines as part of a renewable energy infrastructure initiative led by Barr Engineering.
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Selected by HDR Engineering, we provided geotechnical drilling services for the Virginia Department of Transportation’s (VDOT) I-95 Bidirectional Lanes project. This major infrastructure initiative addresses congestion on one of the busiest sections of Interstate 95 between Springfield and Dumfries, Virginia.
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Corporate Address

1513 Tilco Drive
Frederick, MD 21704

Let's Drill Into Success

Partner with Connelly & Associates for reliable, efficient, and certified drilling services tailored to your unique project needs.
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About Connelly & Associates, Inc.

Connelly & Associates, Inc. is a leading drilling contractor serving
Frederick, MD and the Mid-Atlantic region. We specialize in geotechnical and environmental drilling, sonic drilling, limited access projects, and water well and geothermal drilling.