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Category Archives: Dams

Riverside Dam Class EA – Update to Preliminary Preferred Alternative – Joint Submission

ORA understands the pressure municipalities are under when communities rally to maintain or rebuild their beloved mill ponds.  However, it is up to all authorities and municipalities to take a leadership role that places public safety and landscape scale ecological integrity above local individual or group interests.

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Decommission Howson Dam on the North Maitland River

Looking downstream at Howson Dam on the North Maitland River.

 On 23 – 24 June of 2017, the upstream Gorrie Dam failed and the Howson Dam was at capacity during an extreme rain event and flood when 175 mm of rain fell in just 7 hours, placing more than 150 property owners at risk and resulting in an estimated $11-million in damages in the Town of Harriston. This severe rain event broke previous records by approximately 40% and was the second highest flow on the North Maitland in the 48 years of record. Fortunately, no one was killed; however, it could have been much worse, as in October of 2015, when a South Carolina flood breached 18 dams, and resulted in 16 deaths.

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Gorrie Dam Failure, North Maitland River

Gorrie Dam Breach – Scour Hole

It has come to ORA’s attention that the Gorrie Dam on the North Maitland River failed as a result of flooding during an extreme rain event on 23 – 24 June 2017, and that Maitland Conservation is considering its options.  We understand that no one is more aware of the extremes of a volatile and changing climate than Conservation Authorities, and yours in particular; and we understand the pressure that Conservation Authorities and municipalities are under when communities rally to maintain their coveted mill ponds.  However, it is up to all authorities to take a leadership role that places public safety and landscape scale ecological integrity above local individual or group interests.

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Riverside Dam Class Environmental Assessment – Speed River

Drought conditions could place additional stress on riverine ecosystems, while more extreme rainfall will heighten the risk of dam failures (18 dams were breached in a South Carolina flood in October of 2015) with rapid release of high volumes of water.  There have also been recent dam failures right here in Ontario – the Gorrie Dam failure last year in Wingham was the most recent, putting more than 150 property owners at risk.

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Parkhill Hydro Generating Station, Grand River

In September of 2016, the Grand River Conservation Authority (GRCA) received a Feed-in-Tariff Power Procurement Contract from the IESO to sell power to the grid.  In June 2017, the GRCA initiated a Class Environmental Assessment to evaluate the construction of a waterpower project, the Parkhill Hydro Generating Station located at the existing Parkhill Dam in the City of Cambridge. If approved and constructed, this waterpower project would have a nameplate capacity of 500 kW. The project is subject to the provisions of the Ontario Waterpower Association “Class Environmental Assessment for Waterpower Projects.” Pursuant to the Class EA, this project is considered to be associated with existing infrastructure. Continue reading


EBR-013-1476 – Draft Government Response Statement for the Recovery of the American Eel

The American Eel Needs Your Help!  You have an opportunity to support the recovery of a species that has declined by 99% of its original population, has been completely extirpated from extensive areas of its native Ontario range, and is in steep decline where it still exists.  The Ministry of Natural Resources and Forestry has prepared a Draft Government Response Station for the Recovery of the American Eel in Ontario, and you have until January 11th to sign the Petition below.  More information can be found here.  To add your own comments just click on the letter and type.  Thank you for your help! Continue reading





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