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Navajo Lake Spillway Reconstruction and Embankment Maintenance
Region: Southern
ID: 6054
Project Status: Completed
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Project Start Date
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Project End Date
Fiscal Year Completed
2023
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Final Methods
The final methods did not deviate from the original plan in any meaningful way. The existing, severely deteriorated 20' Navajo Lake concrete spillway was widened to 30' and entirely rebuilt. Additionally, maintenance work was completed along the dirt and rock embankment of the dike (the embankment maintenance work was primarily to replace sections of the dike that had eroded and establish a consistent level, which would help with reducing future erosion). Material for the project was taken from on-site or nearby.
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Project Narrative
An engineering firm was hired in the summer of 2022 through a public bid process and finished the preliminary design for rebuilding the spillway and repairing the embankment. A contractor was then hired through the public bid process in the early fall of 2022 to complete the work to the specifications of the engineered designs. The Utah Department of Facilities, Construction, and Maintenance (DFCM) and the engineering company oversaw the vast majority of the project, with Utah Division of Wildlife Resources personnel assisting DFCM and helping to supervise construction. All work was completed by late fall of 2022. The old dike and spillway was only capable of passing a 10-year flow, while the new dike and spillway are now capable of passing up to 500-year flows. The new spillway and dike performed well in the early summer of 2023 when extremely high flows occurred from the melting of a historic snowpack.
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Future Management
The new spillway and restored embankment will be inspected by the UDWR several times each year and maintenance completed as needed. The fishery is monitored through annual gill net surveys and periodic angler surveys.
Submitted By
Nic Braithwaite
Submitted Time
08/30/2023 09:12:03
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