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[5/19/2026 @ 5:00 PM]

 

Lake Williams Dam Project

Home > News & Updates > Lake Williams Dam Project > Labyrinth Weir Structures

Labyrinth Weir Structures

Construction frame on the new construction of the Lake Williams Dam.
Power conduits being laid at the Lake Williams Dam.

The new labyrinth weir structures are being constructed on the top of the spillway and the new power conduits that will supply all power to the site from the grid.

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Central Penn Business Journal’s 2025 Top Project Awarded to The York Water Company

Lake Williams Dam Recognized with 2024 Regional Best Projects by Engineering News Record
The York Water Company Awarded 2024 National Rehabilitation Project of the Year Award from Dam Safety Officials
Lake Williams Dam Rededicated
Lake Williams Reopens
Work at Stream Crossing
Lake Williams is Full Once More
The Process to Refill Lake Williams Begins
From Haul Road to Essential Feature of the Future Aquatic Ecosystem
Last Placement of Concrete on the Access Apron on the Dam’s Right Abutment was Poured

Top Lift of Conventional Concrete Placed on Dam Crest
Labyrinth Cycle Wall Completion
Drilling & Grouting
Lake Williams Dam Project Update
Armoring Work
Embankment Work Continues
Night Work at the Dam
Spillway Updates
Concrete Installation
Compliance Testing
Last Concrete Slab on the Reservoir Side
100+ Year Old Gate Houses
Labyrinth Weir Structures
Spillway Work
Timber Clearing
Control Building
Gravity Wall Curing
Concrete Work on the Spillway
Non-Overflow Section
Labyrinth Spillway Weir
Dam Control Building Work
Left Abutment Non-Overflow Section
Night Construction on the Spillway
Drain Fill Base Material
Valve Tower Work
The Dam’s New Spillway
Night Work Commences
Original 1911 Core Wall
Steel-Reinforced Core Wall
Parapet Wall Formwork
Two Sluice Gates
New Interconnecting Core Wall
The New Core Wall
Crest of the Dam
Quality Check
Drilling into the Metamorphic Bedrock
Portable Levee Bag System Dismantled
Bedrock Has Been Drilled
Foundational Spillway Plinth
Halfway Point of the Project

Foundation for the New Spillway
Dam’s Plinth Work
Right Transition Gravity Wall Work
Top RCC Lift Surface
Backfilling Begins
Right Training Wall Work
Valve Tower’s Top Deck Formwork
Preparation for the New Core Wall
New Dam’s Labyrinth Weir
Drone Image of Lake Williams Dam Construction
Valve Tower Deck
Formwork for the Valve Tower
Downstream Right Training Wall
Valve Tower’s Third Pour
Past President, Jeff Hines, Visits the Site
Encasement Formwork
Valve Tower’s Second Lift
Second Lift Rebar
Valve Tower to the Spillway
New 48” Pipe
Excavation Continues
Valve Tower Work
Concrete Foundations
The Dam is Being Dismantled
Original Wall Exposed
Core Exposed
Vegetation Visible
Diverting Excess Stream Flow
Soil Nails
Weathered Bedrock
Demolition Video
Roadway Removed
Water Street Bridge Removed
It’s Demolition Time
Water Street Bridge Closed
FAQs for the Lake Williams Dam Project
Lowering the Lake Williams Reservoir
Access Road

Work has Begun
Reservoir Lowered
Geotechnical Tests

Investigations Continue Through 2020
Long Term Project

Lake Williams is “Full”
Water Street Update
Phase 1 Complete
The New Sluice Gates

More Precipitation Than Usual
Lake Williams is Down 22 Feet
Water Street Closed