Bobs Lake Dam 1 Bobs Lake Dam History of Dams at Site History - - PowerPoint PPT Presentation

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Bobs Lake Dam 1 Bobs Lake Dam History of Dams at Site History - - PowerPoint PPT Presentation

Bobs Lake Dam 1 Bobs Lake Dam History of Dams at Site History Dams at outlet of Bobs Lake date back to 1821 Government of Canada purchased the dam site in 1870 In 1871 the size of the dam was significantly increased and Bobs


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Bobs Lake Dam

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Bobs Lake Dam – History of Dams at Site

History

  • Dams at outlet of Bobs Lake date back to 1821
  • Government of Canada purchased the dam site in 1870
  • In 1871 the size of the dam was significantly increased and

Bobs Lake’s place as a reservoir for the Tay and the Rideau Canals was enhanced.

  • Concrete dam dates to around 1930 – several major

repairs and rehabilitations to date

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Bobs Lake Dam

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Bobs Lake Dam

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Bobs Lake Dam – Current

  • A Dam Safety Review concluded that the dam is in poor

condition and did not satisfy dam safety guidelines

  • In June 2015, major rehabilitation work was announced for

Bobs Lake Dam

  • Following geotechnical analysis of the existing dam site, the

rock was determined to be of poor quality.

  • As a result of this analysis, in May 2016 the Government of

Canada announced additional resources in order to complete the full replacement of the Bobs Lake Dam

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Bobs Lake Dam

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Bobs Lake Dam – Replacement

  • Plan is for dam to be located about 40m upstream of existing

site near the location of remnants from an older dam

  • Water management strategy / approach will not change due to

construction – old dam will continue pass water until new dam is built

  • A second spillway will be added in order to meet current

Canadian Dam Association safety guidelines. A second spillway will not alter water management practises, it is being added as a redundancy in case one spillway is blocked (for ex.)

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Bobs Lake Dam – Site of new dam

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Bobs Lake Dam – Preparations

  • Environmental Assessment has progressed
  • More detailed Fish Habitat Assessment and Species at Risk

Study completed

  • Enhanced environmental investigation and design work for

stream channel rehabilitation between old and new dam with intent of creating Walleye spawning zone

  • Archaeology undertaken on provincial property and marine
  • areas. Federal property disturbed by previous projects
  • Engagement with Algonquin First Nation of Ontario underway
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Bobs Lake Dam – Considerations

  • In-water work timing restriction March 15-June 30 to protect

warm and coolwater spawners (i.e. Walleye)

  • Downstream flow will be maintained throughout project
  • Some fish habitat loss as the approximate 40m section between

the old dam and new dam will switch from lake habitat to river habitat; however, new channel designed to allow for Walleye spawning and includes riparian planting of trees, shrubs and grasses

  • Mitigations for species at risk (Gray Ratsnake, Blanding’s

Turtle, Snapping Turtle, Butternut)

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Bobs Lake Dam – Next Steps

Further investigation and preparation work still underway:

  • Fisheries permitting (currently under DFO review)
  • Completion of Detailed Impact Assessment
  • Completion of design, tender and award contract
  • Property right of way purchase for long term access and lease for

construction

  • Liaison with township on new access entrance
  • Continued community engagement

As a result of outstanding project requirements and importance of timing window: Construction target now Summer 2018

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For further information on infrastructure projects: www.pc.gc.ca/rcInfrastructure To be added to the community engagement list – email RideauCanal.info@pc.gc.ca and include Bobs Lake in the subject heading Or Contact: Darryl Whitehead External Relations Manager, Infrastructure Darryl.Whitehead@pc.gc.ca