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Excerpt from http://en.wikipedia.org/wiki/Pitt_Lake

"Pitt Lake is the second-largest lake in the Lower Mainland of British Columbia, being about 53.5 square kilometres in area. It is about 25 km long and about 4.5 km wide at its widest, and is also one of the world's largest tidal lakes, its confluence with the Fraser being only a few miles upstream from that river's estuary into the Strait of Georgia. Its southern tip, where the Pitt River resumes, is 40 km east of downtown Vancouver.

The upper Pitt River valley is a typical U-shaped glacial valley in the Coast Mountains of British Columbia. The over-deepening of the lower end of the valley over the span of the Wisconsin glaciation created a trough over 140 m below current sea level. After initial glacial retreat at around 13,000 years ago a saltwater fjord occupied this basin when relative sea levels were still ca 120 to 140m above current levels in the region. Unlike neighbouring Indian Arm and Howe Sound farther west this fjord basin became cut off by sedimentation of the lower Fraser River by ca 10,500 years ago and is now considered a tidal fjord lake."