ALLISON DRAW FLOOD CONTROL CHANNEL 

Laramie County, Wyoming

Cheyenne Field Office

This "3-Phase"project consists of the construction of a flood control channel through the southern part of Cheyenne, Wyoming.  The watershed is approximately 11,500 acres and the channel is designed to contain the 100 year storm event.

West Greeley Phase: Photographs During Construction

Channel Excavation	Dozer and Excavator	Channel Excavation
Geotextile Placement	Geotextile and Riprap  Placement	D6 Topsoiling
D6 Topsoiling	Scraper Spreading  Topsoil	Channel Excavation
Fine Grading Side Slopes	Concrete Lined Channel  Crossing	Royden James, Project  Engineer Running Air  EntrainmentTest
Concrete Pour on  Channel Crossing Slab	Concrete Pour on  Channel Crossing Slab	1-1/4" Slab Connnecting  Dowels
Concrete Channel  Crossing, Prep Work for  RiprapPlacement on  Sideslope	Concrete Channel  Crossing

West Greeley Phase:  Photographs After Construction

Riprap Lined Channel, Looking West	Mark Opitz, State Conservation Engineer & Royden James, Project Engineer	Riprap/Earth Channel Width  Transition, Looking  South to Prosser Road
Earth Channel, Looking North	Earth Channel, Looking South Toward College Drive	Channel Curve with Riprap into Prosser Road Crossing
Channel Side Slope	Channel Bottom, Looking South to College Drive	Channel Curve Riprap with Side Drainage Inlet
Channel Curve with Riprap Protection, Looking East	Earth/Riprap Channel Width Transition, Looking North	Grouted Riprap Protection from Side Drainage Inlet
Concrete Lined Channel Crossing	Side Drainage into Channel w/ Riprap Protection	Riprap Lined Channel w/ Concrete Crossing and Open Channel Drainage Covered w/ Roadway Grating
Roadway Grating	Channel Seeded	Channel Seeded
Channel Seeded	Channel Seeded	Riprap Lined Channel w/ Seeded Banks