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Allison Draw Flood Control Channel Orchard Valley Phase

Laramie County, Wyoming

Cheyenne Field Office

The Orchard Valley Phase consists of the construction of a combination of earthen flood control channels, multiplate arched corrugated metal pipes, and a grouted riprap-lined channel section near the south end of town (Orchard Valley Subdivision) in Cheyenne, Wyoming.  Total length of constructed items was approximately 3,600 feet.  Approximately 140,000 c.y. of material was excavated, 5,000 c.y. of riprap was placed, and 775 feet of multiplate arched corrugated metal pipe was installed.  In addition, a separate channel and HDPE (High Density Polyethylene Pipe) with associated concrete inlet and outlet structures were constructed to capture runoff from a smaller watershed area and divert it into the main channel system.  Total cost of the project was approximately $1.9 million.  Construction of the project was completed by Connell Resources Inc., Ft. Collins, CO.  Design and project inspection was completed by the NRCS (Natural Resources Conservation Service) State Office Engineering Staff.  The project was designed to provide area residents flood protection from the 25 year storm event.

Project Map
Project Map

Historical Flooding Photographs

Historical Flooding
 

 

Near South 1st & Plum
Street

Historical Flooding
College Drive & Cedar
Street Intersection

Historical Flooding
College Drive & Cedar
Street Intersection

Historical Flooding
Looking East Toward
South 1st Street

Historical Flooding
West Greeley Phase
Channel

Historical Flooding
Near College Drive &
Cedar Street

Historical Flooding
West Greeley Phase
Channel


 

Orchard Valley Phase: Photographs During Construction

Channel Excavation
Channel Excavation

Channel Excavation
Channel Excavation

Channel Excavation
Channel Excavation

Excavation
Channel Excavation

Topsoil Placement
Topsoil Placement

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Multiplate Arched Corrugated Metal Pipe Installation
Multiplate Pipe Installation

Mechanical Compaction
Compaction

Density Test
Density Test

Final Backfill
Final Backfill

Final Backfill
Final Backfill

Final Backfill
Final Backfill

Final Backfill
Final Backfill

Final Backfill
Final Backfill

Concrete Toewall
Concrete Toewall

Concrete Toewall
Concrete Toewall

Geotextile Placement
Geotextile Placement

Geotextile Placement
Geotextile Placement

Riprap Placement
Riprap Placement

Riprap Placement
Riprap Placement

Riprap Placement
Riprap Placement

Riprap Basin
Riprap Basin Outlet

Riprap Basin Outlet
Riprap Basin Outlet

Riprap Lined  Channel
Riprap Lined Channel

Riprap Lined Channel Construction
Riprap Lined Channel

Riprap Lined Channel Construction
Riprap Lined Channel

Riprap Lined Channel
Riprap Lined Channel

Bedding Placement with Dozer
Bedding Placement

Bedding Placement
Bedding

Bedding Placement
Bedding Placement

Multiplate Pipe Installation
Multiplate Pipe Installation

Grouting of Riprap-Lined Channel
Riprap Grouting

Grouting of the Riprap Lined Channel
Riprap Grouting

Outlet Structure
Outlet Structure

Outlet Structure
Outlet Structure

Outlet Structure


Outlet Structure

Inlet Structure


Inlet Structure

Inlet Structure


Inlet Structure

Inlet Structure


Inlet Structure

HDPE (High Density Polyethylene Pipe) Installation


Pipe Installation

HDPE (High Density Polyethylene Pipe) Coupler


Marmac Pipe Coupler

HDPE (High Density Polyethylene Pipe) Installation


Pipe Installation

Erosion Control Fabric


Erosion Control Fabric

Erosion Control Fabric


Erosion Control Fabric

Erosion Control Fabric


Erosion Control Fabric

Mulching

Mulching

 

Orchard Valley Phase:  Photographs After Construction
North Channel

North Channel

North Channel


North Channel

North Channel

North Channel

North Channel

North Channel

South Channel

South Channel

South Channel Seeded and Mulched


South Channel Seeded and Mulched

North Channel Seeded and Mulched

North Channel Seeded and Mulched

North Channel Seeded and Mulched

North Channel Seeded and Mulched

South Channel

South Channel

South Channel


South Channel

Grouted Riprap-Lined Channel

Grouted Riprap-Lined Channel

Grouted Riprap Lined Channel

Grouted Riprap-Lined Channel

North Channel Side Slope Emerging Vegetation

North Channel Side Slope