LOGAN HYDROELECTRIC PROJECT NO. 2
Logan City Light and Power Department
3rd Dam and Surge Tank Construction Improvements
Public Information Meeting
August 2, 2018
5:00 p.m.
Safety Share: Highway Work Zone Safety
Utah highways in 2016 experienced 3,024 vehicular crashes in work zones, causing 1,229 injuries and 11 fatalities
Tips for Drivers Traveling in Work Zones:• Stay alert and minimize distractions• Obey posted signs• Follow the posted speed limit
In order for all of us to go home safe to our families each night, we need everyone to do their part.
Purpose of 3rd Dam and Surge Tank
Construction Improvements
FERC Inspection Identified Concrete Deterioration
FERC Inspection Identified Surge Tank
Cover Concrete Deterioration
Logan City Plan Filed with FERC in Response to Inspection
Replace Gatehouse
Wall
Replace Spillway Gates
Replace Spillway Steps
Replace Spillway Walls
Replace Gatehouse
Remove Sediment
Replace Surge Tank Roof
Place Rock
Riprap
Remove Bypass
Pipe Install Stilling Basin
Public Information Meeting Overview
• Primary Construction Improvements Summary
• Construction Schedule Summary
• Public Safety Information Summary
– Temporary Trail Detours
– Temporary Public Road Closures
– Temporary Public Road Lane Closures
• Address Questions Following Presentation
Primary Construction Improvements Summary
Replace spillway crest gates with Obermeyer weir panels
Spillway crest gates
Obermeyer weir panels –view looking downstream
Obermeyer weir panels – view looking upstream
Air bladders inflated
Primary Construction Improvements Summary
Spillway abutment walls
Replace spillway abutment walls
Primary Construction Improvements Summary
Dam abutments
Protect dam abutments with
rock riprap
Primary Construction Improvements Summary
Spillway steps and concrete slabs
Stabilize spillway steps and replace
concrete slabs
Primary Construction Improvements Summary
End of spillway
Add a concrete stilling basin at end
of spillway for energy dissipation
of river flow
Primary Construction Improvements Summary
Gatehouse
Replace gatehouse, gatehouse wall, intake weir, and minimum flow
bypass
Intake weir (inside gatehouse)
Minimum flow bypass
Gatehouse wall
Primary Construction Improvements Summary
Replace intake trash rack and rehabilitate/raise
trash rake
Trash rake
Intake trash rack
Primary Construction Improvements Summary
Replace low-level sluice gate and sluiceway walls
Sluiceway walls
Low-level sluice gate (under wall)
Primary Construction Improvements Summary
Rehabilitate upstream concrete
dam face
Upstream concrete dam face
(below water surface)
Primary Construction Improvements Summary
Replace surge tank roof and repair surge tank walls
Surge tank roof
Surge tank walls
Future Construction Improvements
Sediment dredging in the reservoir
upstream from 3rd
Dam will be performed after
construction improvements are
completed
Sediment Bar
Sediment Deposit with Cattails
Construction Schedule Summary
Surge Tank Construction Improvements Started July 23, 2018
Surge Tank Construction Improvements Completed by August 31, 2018
Third Dam Construction Improvements Start September 1, 2018
Spillway Improvements Worked on First
Intake/Gatehouse Improvements Worked on Second
Third Dam Construction Improvements Completed by May 17, 2019
Logan City, Stantec, Gerber Construction, Forest Service, and UDOT have planned for public safety during 3rd Dam and surge tank construction improvements
• Local websites/social media will be provided with periodic construction updates
• Temporary Trail Detours
• Temporary Public Road Closures
• Highway 89 Traffic Safety – Lane Closures
Public Safety Information Summary
• Cache County Trails webpage (www.trails.cachecounty.org)
• Cache Hikers website (www.cachehikers.org)
• Cache Valley Visitors Bureau website (www.tourcachevalley.com)
• Utah Trailhead website (www.utahtrailhead.com)
• Stokes Nature Center website (www.logannature.org)
• Logan City 3rd Dam Project web-page (http://www.loganutah.org/government/departments/light_and_power/index.php)
• Forest Service Logan District Ranger and Recreation Specialist for posting on UWCNF Twitter and Facebook accounts
Local Websites/Social Media to be Provided with Updates
Temporary Trail Detours – September 1 to May 17
Temporary Trail Detours – Public Information Signs
Temporary Trail Detours – Detour Signs
Temporary Trail Detours – September 1 to May 17
Temporary Public Road Closures – FR 20125
FR 20125 and Gus Lind Flat Dispersed Camping Area closed from September 1, 2018to May 17, 2019
Temporary Public Road Closures – FR 27044
FR 27044 closed from September 1, 2018 to May 17, 2019
Temporary Public Road Closures – Highway 89
Highway 89 Flagger-Controlled Temporary Closures For Less Than 15 Minutes Each Direction During Critical Construction Activities from September 1, 2018 to May 17, 2019
Temporary Public Road Lane Closure – Highway 89
Highway 89 Temporary Eastbound Lane Closure With Flagger-Controlled Alternating Traffic Each Direction During Critical Construction Activities from September 1, 2018 to May 17, 2019
• Logan City appreciates your patience, understanding and help in
protecting public and contractor safety during 3rd Dam and surge
tank construction improvements.
• Local websites and social media will be provided with periodic
updates during construction to help keep the public informed of
Project progress.
Thank You For Your Interest in 3rd Dam and
Surge Tank Construction Improvements Project
Questions
and
Answers
Logan City Light and Power Department