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Recurring Event Event Series: Reef Ball Builds

Mt. Harmony Reef Ball Build – Day 2

Mar 30

Reef Ball Build FAQs

What is a Reef Ball?

Reef balls are a specially designed artificial reef unit that are used worldwide to build and restore reef habitat. Here in the Chesapeake, reef balls provide important three-dimensional habitat for oysters and many other filtering organisms to attach to. They also provide hollow structure for juvenile fish and crabs to hide from predators. Yes, it’s those predators we pursue as anglers, so reef balls also make some great fishing spots too.

What am I volunteering to do?

Volunteers will be working on behalf of CCA Maryland. You will be outside in teams (or individually) to assemble reef ball molds and then help fill the reef balls with concrete delivered from a truck.

Bathrooms are available, as well as a place to sit in the shade and enjoy your lunch or take a break.

This is a simplified version of what we do for the Living Reef Action Campaign when working with students or other partners.  For most reef ball builds, we hand mix concrete or use small electric mixers.  For others, a concrete truck will arrive and you will help fill the molds you’ve assembled using gravity as your friend.

Depending which day you attend, you may remove the molds from previously built reef balls first and set molds up for another pour later that day.

Can I bring a group of friends or colleagues?

Yes!  There is no maximum sized group to participate.  We will aim to build around 25 reef balls per day, and can likely add to that number with additional molds for the right group.

To discuss organizing a reef ball building activity for your group or company, please contact David Sikorski at (443)621-9186 or via email to david@ccamd.org.

What should I wear?

We’d recommend long pants and multiple layers in light colors. For one, lighter colors are cooler in the sun. What’s the second reason? Some say that biting flies seem to be more attracted to darker fabrics.

Bring layers and changes of clothes based on your own assessment of the weather. We have gloves you can borrow. Closed toed shoes are best, especially ones that you can get dirty.

I have more questions

Include them in your volunteer form comments, or email information@ccamd.org and one of our staff or volunteers will be in touch.

reef ball build

Can't attend? Please consider making a donation to support all of our efforts to protect recreational fishing and marine habitats for future generations.


Mt. Harmony Elementary School
900 W Mount Harmony Rd
Owings, MD 20736 United States
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A reef ball building activity. Lo-Profile molds being poured by hand. Photo Credit: St. Mary’s River Watershed Assoc.
A reef ball building activity. Lo-Profile molds being poured by hand. Photo Credit: St. Mary’s River Watershed Assoc.
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