Grand Lake St. Marys

Grand Lake St. Marys
40.5253° N, -84.4932° W
Grand Lake St. Marys

Grand Lake St. Marys, Ohio’s largest inland lake, sprawls across 13,500 acres, inviting adventurers, wellness seekers, and families to indulge in its vast waters. Constructed between 1837 and 1845 as a reservoir for the Miami and Erie Canal, this lake is a testament to human labor, built by men using only shovels, pickaxes, and sleds pulled by mules.

Here, water recreation is king: fishing, swimming, boating, skiing, and tubing are just a few of the many activities that draw visitors. The lake’s historic past is as intriguing as its natural beauty, with eagle watching and picnicking offering serene moments amidst the bustling water sports.

Nearby, the Memorial Park in St. Marys boasts the Belle of St. Marys Canal Boat, Memorial Covered Bridge, and Veterans Walkway, while the Splash Pad provides a refreshing spot for families during summer. The Armstrong Air and Space Museum in Wapakoneta and the Bicycle Museum of America are must-visits for those intrigued by history and innovation. For those seeking relaxation, the lake’s expansive shoreline offers perfect spots for camping and reconnecting with nature. Whether you’re seeking adrenaline-pumping adventures or tranquil retreats, Grand Lake St. Marys is a destination that caters to all.

Surface area (mi)
32.68
Max depth (ft)
16.01
Elevation (ft)
869.42
Shoreline length (mi)
73.94
Best time to go
Visit Grand Lake St. Marys in late summer, ideally August, when the sun bathes the shimmering waters in golden light. Enjoy tranquil fishing days, vibrant sunsets, and the sensory delight of warm breezes. The annual Art Deco Weekend brings local charm, making it a perfect escape while crowds dissipate. Embrace the peaceful allure of this pristine oasis.
Water Quality
The water color at Conchas Lake can vary but is often described as stained, which might appear brown or tea-colored due to the presence of sediments. The water clarity is typically around 2-4 foot visibility, making it somewhat murky. The shoreline scenery features medium- to light-gray sandstone formations, particularly from the Trujillo Formation, with red hues produced by the oxidation of iron in the minerals, set against a backdrop of rocks deposited during the Mesozoic Era.

Ideal for

  • Family friendly:
  • Pet friendly:
  • Romantic getaways:

Popular activities

  • Boating
  • Waterskiing
  • Kayaking
  • Canoeing
  • Fishing
  • Hiking
  • Jet Skiing

Islands

Amidst the serene expanse of Grand Lake St. Marys, a couple of charming islands offer a splendid retreat into nature’s embrace. Used primarily for recreation, these lush escapes serve as both tranquil oases and exciting adventure hubs. Historically, the islands reflect the vibrant lore of the area, once utilized by Native Americans and later as waypoints for early settlers. A leisurely hike unveils captivating trails lined with wildflowers and towering trees, leading to scenic lookouts perfect for photography. Remnants of the past still whisper from historical structures, adding character and depth to the landscape. Embrace the unparalleled opportunity to explore the islands’ diverse wildlife, or simply unwind by the water’s edge, savoring the sunset that paints the sky in hues of gold and crimson. This serene getaway is a hidden gem, inviting those seeking solace and adventure in an enchanting natural setting.

Nearby amenities

Visitors will find an abundance of amenities around this scenic Ohio lake. For boating enthusiasts, Grand Lake St. Marys offers several options including the Grand Lake St. Marys State Park marina, public boat ramps, and a boat rental service at the marina. Those interested in water activities can launch canoes or kayaks directly at designated areas. The nearby Walmart and local grocery stores provide convenient shopping for supplies, while the nearby town has bait shops and fishing supply stores for anglers. Dining options include the popular Skillet Restaurant, which features scenic lakefront views and outdoor seating. For overnight stays, campers can enjoy facilities at the State Park campgrounds, while cabins and vacation rentals are also available around the lake. If you’re looking to unwind, the area hosts picnic spots with BBQ grills and even a floating water park for families. Accessible parking and restrooms are widely available, ensuring a comfortable visit for everyone.

Frequently Asked Questions

Ready to dive into what Grand Lake St. Marys has to offer? Let’s tackle some of the burning questions you might have as you plan your visit!

  • No, it is not safe to swim in Grand Lake St. Marys. The lake has public health advisories due to high levels of algal bloom toxins like microcystin, which can cause serious illnesses, including liver damage and other health issues. Swimming and wading are not recommended at the lake’s beaches.

  • Grand Lake St. Marys is a popular destination because it is Ohio’s largest inland lake, offering various water activities like fishing, swimming, boating, and skiing. The lake also provides opportunities for picnicking, eagle watching, and camping, making it a versatile spot for outdoor recreation.

  • There are no specific fishing hours or restrictions unique to Grand Lake St. Marys, Ohio. General statewide fishing regulations apply, and anglers must follow those rules. The lake is open for fishing from sunrise to sunset, but this is not a lake-specific rule, it applies to certain other areas in Ohio.

  • No, dogs are not allowed on the swimming beaches at Grand Lake St. Marys. However, dogs are permitted in other areas of the park and there are dog parks available for them to play off-leash. Dogs can also be walked on leashes in other parts of the park.

  • Towns near Grand Lake St. Marys include Celina, Wapakoneta, Sidney, and Van Wert. These towns are all located in the same general area in western Ohio, with Celina being the closest and situated directly along the lake.