Based on the latest information available, the boat ramp named County Road 73 Northeast 3556 in Alexandria, Minnesota is a concrete boat ramp that is approximately 12 feet wide. The ramp provides access to Lake Mary, which is a popular recreational lake in the area.

Lake Mary is known for its clear water and sandy beaches, and it is a popular destination for boating, fishing, and swimming. The lake is approximately 2,450 acres in size, and it has a maximum depth of 40 feet.

According to the Minnesota Department of Natural Resources, Lake Mary allows motorized watercraft up to 150 horsepower, as well as sailboats and other non-motorized watercraft. However, there may be specific rules and regulations regarding boating on Lake Mary, and it is important for boaters to check local ordinances and guidelines before launching their craft.