Standing Boy Creek. It curves to the north-northwest and has an interchange with SR 315. It crosses over Mulberry Creek and curves to the northwest. It winds its way to the north-northeast, traveling parallel to SR 219. It crosses over Little Creek just to the west of Peterson Lake and just south of an interchange with SR 116. The highway winds its way to the north and crosses over Mountain Oak Creek. At an interchange with Hopewell Church Road, SR 219 turns away from the Interstate. I-185 curves to the northeast and crosses over House Creek Tributary. It then has an interchange with SR 18. After it crosses over Ingram Creek, the highway parallels the creek briefly and then enters Troup County. Troup County I-185 curves to the north-northeast and crosses over Turkey Creek. It then crosses over Polecat Creek before curving to the north-northwest. It then crosses over Flat Shoals Creek. It curves to the north-northeast and has another interchange with US 27/SR 1 (Martha Berry Highway). The highway then crosses over Mud Creek. It curves to the north-northwest and crosses over Panther Creek. After curving back to the north-northeast, it has an interchange with Big Springs Road. It curves back to the north-northwest and crosses over some railroad tracks of CSX Transportation on the southeastern edge of LaGrange. The highway begins to skirt along the eastern edge of the city. It crosses over Long Cane Creek and then curves to the north-northeast again. It leaves the city limits of LaGrange and travels under a bridge that carries SR 109. It then meets its northern terminus, an interchange with I-85. National Highway System The entire length of I-185 is part of the National Highway System, a system of routes determined to be the most important for the nation's economy, mobility, and defense. History In 1966, the highway that would eventually become I-185 was under construction from its current southern terminus to Buena Vista Road, which, at the time, was signed as SR 357. However, the highway was signed as SR 1, since the current SR 1 had been redesignated as SR 1 Business (SR 1 Bus). SR 1 was proposed from SR 357 to US 27/SR 1 Bus in the northern part of Columbus. The next year, this segment was open. It was under construction from SR 357 to US 27/SR 1 in the northern part of Columbus. In