The Hana Highway is a long stretch of Hawaii Routes 36 and 360 which connects Kahului with the town of Hana in east Maui. On the east after Kalepa Bridge, the highway continues to Kipahulu as Hawaii Route 31 (the Piilani Highway). Although Hana is only about from Kahului, it takes about 2.5 hours to drive when no stops are made as the highway is very winding and narrow and passes over 59 bridges, 46 of which are only one lane wide. There are approximately 620 curves along Route 360 from just east of Kahului to Hana, virtually all of it through lush, tropical rainforest. Many of the concrete and steel bridges date back to 1910 and all but one are still in use. That one bridge, badly damaged by erosion, has been replaced by a portable steel ACROW bridge erected by the United States Army Corps of Engineers.