Log arches enable low-impact operations in sensitive places, resulting in less ground disturbance and clean logs for portable sawmilling. LogRite arches are available in three sizes: small, medium, and giant. The length of each leg can be adjusted to fit the site requirements. The legs can be locked into position with pin locks or welded into place. Architects use the term "log arch" to describe a structure built from prefabricated panels that are shaped like large tree trunks and then joined together at right angles, much like the ribs in a wooden boat. These structures provide support where it is needed while leaving the remainder of the site intact. They are ideal for areas where heavy equipment traffic is expected, such as logging camps or mining sites. Because the individual trunk-shaped panels can be made in various lengths, log arches can also be used where space is limited. The first log arches were built by Native Americans for timber bridges over creeks or rivers. Early European settlers also used log arches for this purpose. Today, log arches are employed primarily for parking garage floors and similar applications where resistance to wear due to vehicle traffic is required. The first road-worthy log arch was built in 1913 by W.C. Bruderleer in Minneapolis, Minnesota.