A substantial effort continued in 2016 to accelerate the maintenance program for the Chippewa Flood Control Project. The 2009/10 inventory of our 33 miles of Channel indicated that more than 400 pipe structures (typically culverts) are in need of replacement. These pipes were original to the Project, and have exceeded their expected lifespan of roughly 25 years. Current assessment dollars provide the funds to address many more pipes than was possible in the past. This year 5 pipe structures were replaced with much more durable HDP plastic pipe, with the work occurring in Reach CC04. The cost to replace these pipes, including the restoration of access points, was roughly $77,000.
Maintenance berms alongside nearly the entire 33 miles of Channel provide us the access to perform channel inspections, periodic mowing, and the maintenance/replacement of pipes. Some of our maintenance berms are mowed annually, while others have not received sufficient attention. In 2016 nearly 5 miles of channel had projects to reestablish the berm.
Chippewa’s eight Flood Control Dams are in excellent condition, receiving annual inspection, mowing and debris cleanup.
Dams foundation inspection
This year we used remote conrol camera's coordinated with a GPS system to inspect the dams foundation drainage system.
Vegetation management is key to preserving channel capacity for flow, and providing access for maintenance activities along the 33 miles of channel that we are responsible for.
CC04 LB Structure Replacement
Five Pipe Structures were replaced, and two improved, between Coal Bank and Black Diamond Rds.
Security fencing and gates were replaced and installed at several locations along the channels and at one of the dams.
Hazardous Tree Removal
In the 40 years since the project was constructed, many trees have grown to a size and condition that they become a problem.