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SPILLWAYS

Project Description

Spillways: In the wake of 2017 failure of the Oroville Dam Spillway, the Division of Safety of Dams (California Department of Water Resources) is requiring owners of high-hazard dams to conduct a comprehensive study of their spillways. PID has two spillways affected by this requirement: one each at Paradise Lake and Magalia Reservoir. Following the detailed analysis, PID will be required to make any required spillway repairs/upgrades that come to light as a result of the study.

Additionally, Magalia Dam, built in the early 1900's and needs rehabilitation. 

Magalia Dam, built in 1918 is a hydraulic-filled dam, rated poor by the Division of Dam Safety and at full capacity is considered a high downstream hazard should there be a significant earthquake. Because of this rating, the State Division of Dam Safety (DSOD) limits the reservoir elevation to 2200 feet at a loss of approximately 2000 acre-feet of water storage.

The Paradise Irrigation District is actively working on a design to bring Magalia Dam and spillway back into compliance with the DSOD, as well as widen the top of the dam to allow for future widening of Skyway for future fire evacuation needs (limited evacuation routes were an issue during the Camp Fire). While not in compliance, Magalia reservoir’s storage capacity is limited to 796 acre-feet, a small fraction of its designed volume, which reduces water storage that could be used for fire-fighting efforts. The project is designed to also replace and relocate the spillway to the opposite side of the dam reducing damage risk to the water treatment plant.

 Current Design Status

The design is fully funded and 60% complete. Design was delayed almost a year by FEMA pending environmental approval for investigative boring. 100% design is expected by Fall 2024. We are also engaged with Bute County to see if there is a desire to reconstruct the road that runs across the dam into Magalia.

Spending Plan (will be updated to reflect necessary spending as a result of design work in progress)

 Project Phase Previous Fiscal Year Expenses  Fiscal Year 15/16  Fiscal Year 16/17  Fiscal Year 17/18  Fiscal Year 23/24  Fiscal Year 24/25 Estimated Future Construction Cost Total
 Design / Management  -   -   -  $350,000  $579,912 $2,000,000 $6,000,000 $8,929,912
 Construction  -   -   -  $100,000    -  $60,000,000 $100,000
 Total - - - $450,000  $579,912  $2,000,000 $66,000,000 $69,029,912

Project Manager

  • Blaine Allen
    Department: Engineering

Funding Source

Project Status

design icon Planning

 

 

Benefits to PID and its Customers

Increased spillway safety.

Anticipated Project Timeline

 concept3
Concept Approval
planning icon
Planning
design icon
Design
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Construction
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Completion
June 2017 May 2017 - Sept. 2017 current - -
 

 

Project details updated December 2017

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