(ST. CLAIR COUNTY) -- Shell Canada experienced a crude oil tank leak at their facility in Ontario, Canada Thursday afternoon. Residents near the St. Clair River may detect a strong odor that could be present over the next day or two. St. Clair County Emergency Management Director Jeff Friedland says there is no immediate threat to citizens in St. Clair Township in Ontario, Canada or in St. Clair County, Michigan. Canadian and U.S. authorities continue to monitor the situation. The Michigan Department of Environmental Quality says there is no threat to the St. Clair River. The City of Port Huron and the Marysville Fire Department are monitoring air quality as a precautionary measure only. At this time, Shell is allowing crude to flow to an oily water separator and estimate the pump-out time to be up to four days. Once again, there is no threat to area residents along the St. Clair River following a crude oil spill at Shell Canada.