at the head of the Oatka Valley it follows for the rest of its run. Again crossing under Route 19, it has descended since its rise. From Newburg it meanders northwest, then north, staying close to the highway on the valley floor. Several miles further downstream it enters Warsaw, the county seat. It goes under Route 19 again and trends to the west, flowing under U.S. Route 20A to pass to the west of Warsaw High School and its athletic fields. North of the village the valley widens, staying generally level. The creek and NY 19 cross again amid large cultivated fields. The valley begins to angle northeasterly towards Wyoming, which the Oatka bypasses to the southeast into a large wooded area. It then passes through the largest wetlands along it course. North of that it crosses Route 19 again as that road turns eastward briefly. The two return to each other when they cross into Genesee County at Pavilion, where NY 63 crosses as they resume a northward heading, and there is another significant wetlands area. In another small wood two miles (3.2 km) north of Pavilion, US 20 crosses. The creek bends west, reaching its greatest distance from Route 19, then north-northeast back to the highway's vicinity. It enters the village of Le Roy on a northeast course, crossing Route 19 again as it widens into a reservoir behind the dam just south of NY 5. It narrows again north of the village towards Buttermilk Falls and the section that flows underground in warm, dry weather. The valley here is broad, its walls now long and gently sloped instead of steep and short. After going over the falls, marking the Onondaga Escarpment, it turns east, leaving NY 19 a mile south of the New York State Thruway. This geologically distinct section is known as the lower Oatka. It dips south, north and then south again through a largely wooded area as it approaches Genesee Country Village and enters Monroe County near Mumford. After bypassing that hamlet to the north, NY 383 parallels on the north and the CSX rail line across New York on the south, as the creek reaches Oatka Creek Park, a large tract of former farmland to its south. Here both road and rail are to the north of the stream, widening again. Beyond the park it enters an area of predominantly farmland again as