Granby Dam Flume Replacement

The flume replacement project near the base of Granby Dam was awarded to Meridiam Partners after submission of a Statement of Qualifications, proposal and client interview with the Northern Colorado Water Conservancy District. This proposal-based project consisted of removing the existing flume and measurement structure and replacing it with a concrete weir and updated measurement system.

Meridiam was chosen for this project due to the means and methods presented for construction, and experience and water diversion methods presented. Turbidity of the river during construction was always to be minimized as there is private fishing access downstream.

The project consisted of approximately 2,500 CY of excavation, construction of a 106’ concrete weir in the river bottom, 2,000 CY of riprap placement, stream restoration and installation of associated water measurement devices. This project was completed ahead of schedule and on-budget.

Meridiam crews used Trap Bags and supersacks to act as the river diversion. This element was crucial during construction of the project as river flows through Granby Dam were expected to reach 108 cubic feet per second during the fall. The Colorado River was diverted to the west to start the project and then diverted to the east to complete construction of the concrete weir. This enabled Meridiam to minimize turbidity in the river and minimize dewatering in the excavation.

Downstream water users and the Client continually monitored turbidity with meters during construction and Meridiam was able to stay well below measurement standards set for the project.

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