Cook Lake Spillway Reconstruction

On July 8, 2019, Cook Lake Recreation Area on Bearlodge Ranger District closed to the public for spillway reconstruction. The project includes demolition of the existing spillway and construction of a new spillway, embankment, stilling basin, and bridge. Cook Lake Recreation Area is expected to reopen in November 2019.

This site will provide updates on the project.

September 16, 2019

Dentates and baffle blocks in spillway chute.

Baffles and dentates in spillway chute

 

Stilling basin with forms removed from walls.

Stilling basin with forms removed

 

August 29, 2019

Placing concrete into the wall forms.

Image of concrete being placed into wall forms

 

Spillway formwork done and braced, ready for concrete.

Image of formwork for spillway walls

 

August 15, 2019

Spillway slab placement nearly completed.

Image of workers placing concrete for new spillway slab

 

Formwork for the mud slab over the sand/gravel filter drain.

Gravel formwork for spillway slab

 

Cleaning out the stilling basin footprint.

Image of heavy equipment cleaning out the spillway stilling basin

 

August 9, 2019

Lake drawdown was completed on August 8. 

Image of drained lake and cattails, 8/9/2019

 

July 30, 2019

The lake level has dropped significantly.

Cook Lake Update

 

Three of the four culverts have been removed and excavation for the new spillway floor has begun.

Cook Lake Update

 

July 18, 2019

Pumps are draining the lake. Recent rain has slowed this process.

Pumps draining the lake

 

The embankment below the culverts has been removed.

embankment below culverts removed

 

July 11, 2019

U.S. Bureau of Reclamation workers are staging equipment and preparing to draw down the lake prior to spillway demolition.

Cook Lake Spillway Reconstruction

 

The log mat that dissipated outflow below the culverts has been removed.

Cook Lake Spillway Reconstruction





https://www.fs.usda.gov/detail/blackhills/landmanagement/?cid=FSEPRD642862