Onondaga Creek
Onondaga Creek is a major tributary of Onondaga Lake which is located in Onondaga County, New York. The headwaters of the creek originate south of the city of Syracuse near the hamlet of Vesper, in the town of Tully, New York. The creek flows north through the Tully Valley and through the city of Syracuse where it empties into Onondaga Lake. The major tributaries of Onondaga Creek are the West Branch of Onondaga Creek, Hemlock Creek and Rattlesnake Gulf. History. In the late 1940s, the Army Corp. of Engineers built a flood control dam and reservoir within the  Onondaga Nation Reservation for the purpose of regulating the peak flow that reaches the city of Syracuse. The structure influences the creek's flow pattern only in the event of a large runoff when a portion of very high flow is stored in the reservoir and later released back into the creek when the water recedes.