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December -
Phase II compaction grouting
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December -
Installing remedial stone columns on the 284 bench, land side
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December -
Lower dewatering wells on the north end ready to be energized
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December -
Predrilling for sheet piles for S-2 and starting sheet pile installation for S-2 on the river side
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November -
S-2 drilling & grouting, 20 hr. days
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November -
Emergency Floodgate Structure (EFS) spillway grouted
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November -
Phase II ground improvement
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November -
Flood gate installation, final grouting
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October -
Excavating down to elev. 260
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October -
Aerial photo taken October 25, 2011
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October -
SPT Testing near southwest corner of power house
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October -
Phase I stone column installation
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September -
Sheet pile driving on the river side
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September -
Redevelopment of south, lower dewatering wells, river side
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September -
EFS construction
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September -
Testing for the Phase II ground improvements
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August -
EFS base slab construction
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August -
Excavation starting at 260
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August -
Low mobility grouting
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August -
Aerial photo taken August 25, 2011
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July -
EFS construction
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July -
Stone column installation
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July -
Pre-drilling for sheet pile driving
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July -
First concrete placement for EFS
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June -
Access road repairs
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June -
Sheet pile driving
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June -
Dewatering of cofferdam
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June -
Aerial photo taken June 23, 2011
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May -
Dewatering of the cofferdam
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May -
100 year flood - May 2, 2011 - The Army Corps of Engineers, with agreement from the Federal Energy Regulatory Commission (FERC), directed AMP to flood the cofferdam.
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May -
100 year flood
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May -
100 year flood
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April -
Access road flooding
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April -
Rip rap lining
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April -
Sheet pile cut off wall installation
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April -
Stone column installation
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March -
Demolition of Corps gate structure
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March -
Sheet pile cut off wall installation
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March -
Setting up for stone column installation
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March -
Cofferdam excavation
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February -
Demolition of the old Corps test gate structure
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February -
The completed upper dewatering manifold, as seen looking west toward Smithland Dam and Illinois
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February -
Primary excavation in progress, as seen looking north over the upper dewatering manifold
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February -
Primary excavation is ongoing
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January -
View of the fixed weir from the southwest corner of the cofferdam
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January -
Construction of upper dewatering manifolds
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January -
Test gate demolition
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January -
Demolition of the test gate facility