sentences:  Joseph Bigelow, a businessman and later the Reeve of Port Perry and James Graham, Reeve of Scugog, played a significant role in the construction of two causeways across the lake – the Scugog and the Cartwright Causeways.These were gradually reinforced over the span of a century (1856–1960) before reaching their present state, and now carry Highway 7A.Lake Scugog was created when William Purdy and his sons dammed the Scugog River in Lindsay (Upstream from the current dam and locks) in 1834 to power his grist mill.