Edmontonians are being asked to “exercise extreme caution” as water levels rise on the North Saskatchewan River and its tributaries following continuous rainfall this week. City officials in a Thursday news release warned that the river, shorelines and trails directly near the river may be unsafe due to rising water levels and increased current flow following a rain storm that dumped a large amount of rain on the province over the last 24 hours. The city said flooding may occur in some areas along the North Saskatchewan River and other natural waterways.