About Us

Southeastern Dock Supply is a 3rd generation, family-owned business based out of beautiful Lake Lanier, Georgia! The company began as a leading dock supplier when Ed Mahnke founded the company in the early 1980’s. Ed had opened the county’s first mini storage and saw the need in his customers to distribute dock materials to the lake’s residents. Ed retired and handed his business over to his daughter, Liz, who grew the company and became Shoremaster’s top distributor in the Southeast. In 2018, Liz followed in her father’s footsteps, passing the business along to her daughter, Colleen, and son, Patrick.

Patrick and Colleen grew up in Young Deer, on the south end of Lake Lanier, working in the family business since a young age. In 2018, Patrick graduated with a business degree from Ole Miss motivated to getting into the family dock business and partnered with his sister Colleen, who had recently decided to leave the corporate life of Atlanta after attending the University of Hawai’i. Southeastern Dock Supply had been mainly focused on distributing dock products to residents and dock builders but decided to help our customers even further by remodeling, repairing, and building docks. So, in 2019, Southeastern merged with Shoreline Floating Docks and Anthony Chastain. Anthony brings to Southeastern 25+ years of dock expertise and knowledge and a reputation of quality, integrity, and passion that has carried over into our craftsmanship today.

Today we continue the tradition of dock supply distribution to dock builders and lake residents all over the southeast. We purchase our supplies in bulk quantity, so we are able to pass our discounts along to our customers. We even offer further wholesale pricing to local dock builders to make sure our lakes are covered with the highest quality products available on the market. From winches to jet ski ports, to decking and boat lifts, we’ve got your dock covered!

Do you need a dock upgrade or remodel? Have you experienced recent storm damage?  How about a bi-weekly dock watch service that moves your dock in and out as water levels fluctuate? We are here to help with all of that! We have a friendly, dedicated team of professional dock builders and installers ready to assist with all your projects on the water. There is no job too big or too small and our in-house fabrication is always available to guide you with any ideas you may have.

Southeastern is comprised of a brother and sister, an uncle and a nephew, cousins, and even a husband and wife —We can truly call ourselves a family business. Our goal is to always reach the highest possible customer satisfaction and welcome those customers into our lake family. As a family that grew up on the lake, we understand the needs of our customers and want to provide the most positive experience possible! We know that the times spent on the water are you and your family’s most memorable, so purchasing products with your family’s safety in mind is our top priority. We hope you enjoy all of our products and that you will continue to support our local, family owned business!

- From our lake family to yours—Welcome!