A New Way to Prevent Ice Buildup

Due to ice buildup, the radial gates on the Morony Dam spillway were not operating correctly in the winter. NorthWestern Energy asked Morrison-Maierle to conduct a feasibility study to address this issue and found the best remedy: replacing the radial gates with new vertical lift gates with an internal heating system.

To ensure this solution performed correctly, Morrison-Maierle designed modifications, including cutting new guide slots in the existing piers and a new housing structure for the new hoist system. They also replaced the pier tops to support the new hoist structure.

Morrison-Maierle’s design also included procurement specifications for the new gates, hoists, heated guide system, and construction sequencing for the spillway and pier modifications.

Finally, Morrison-Maierle provided on-site inspections and construction observation to ensure compliance with the design drawings.