Att_2_Industry_Day_Presentation_1_Provo_Area_Office_5.pdf
PDF 4 MB Posted
- Solicitation number
- 140R4024R0020
About this file
This document appears to be an Industry Day presentation for the Hyrum Dam Spillway Replacement project. The presentation provides an overview of the existing Hyrum Dam, including its key features, deficiencies in the current spillway, and the need for corrective action. The proposed solution is to construct a new spillway on a new alignment, with 100% design completion targeted for December 2024 and construction beginning in Spring 2025. The presentation also discusses construction constraints, such as impacts to the Hyrum Feeder and East Field Canal, as well as construction considerations, including the need for a robust foundation treatment due to the poor erosive soils. The goals of the project are to commission the new spillway as soon as possible, continue irrigation deliveries during construction, and achieve a fair price. The related federal contract opportunity is a Special Notice for an Industry Day, with the solicitation number 140R4024R0020, issued by the Department of the Interior Bureau of Reclamation.
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Text version
Hyrum Dam (UT)
Hyrum Dam
Located on Little Bear River near Logan, Utah
Provides Irrigation Water and Recreation
Completed 1935
Hyrum Dam Site Overview
Hyrum Dam
Existing Spillway
Key Features:
Trapezoidal Chute (~1,100 feet)
(3) 16 x 12.5-foot Radial Gates
Crest Elevation – 4660 feet
TOA Elevation – 4672.5 feet
Discharge Capacity ~9,000 cfs
Existing Spillway Deficiencies
Foundation
Spillway Chute
Stilling Basin
Crest Structure
Foundation Deficiencies Material
Low Strength
Erosive
Voids Under/Behind Spillway
Voids have been mapped with GPR
Spillway Chute Deficiencies
No Defensive Measures
No Waterstop Between Joints
No Drainage Behind Walls
Drainage Under Slab that is unfiltered
Poor Concrete Condition
Stilling Basin Deficiencies
Erosion in Downstream Channel
High Exit Velocities
Crest Structure Deficiencies
Lightly Reinforced
Not Designed for High Seismic Loads
Need for Corrective Action
Plan
Existing Spillway
Proposed New Spillway
• New spillway on a new alignment
• 100% Design – December 2024
• Construction Begin – Spring 2025
Outlet Works 24-inch pipe will only release 50 cfs
Outlet Works Improvements In the process to increase the outlet works size to a 36-inch pipe with a capacity of 200 cfs
Construction likely to start in September 2024
Construction Constraints
Features that will be impacted:
Hyrum Feeder
East Field Canal
Adjacent Landowner
East Field Canal Hyrum Feeder
Pipeline
Existing Spillway
Proposed New Spillway
Adjacent Landowner
Construction Considerations
Existing spillway is in poor condition Current outlet works are too small to impact reservoir operations Enlarged outlet works still too small to control reservoir during high runoff years East Field and Hyrum Feeder canals may be impacted by construction Downstream landowner access during construction Due to poor erosive soils, the foundation treatment (included in the design) will be a key consideration
Needs
Safe and reliable new spillway Continued operation of reservoir and existing spillway until new spillway is operational Open communication regarding impacts to East Field and Hyrum Feeder Canal
Goals
Commission new spillway as soon as possible Continue irrigation deliveries during construction Fair price
Questions
File details come from the government source that posted it. Updated .