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E1: Vegetation Control and Sediment Removal for Flood Protection

This project supports the District’s ongoing vegetation control and sediment removal activities that reduce flood risk by maintaining design conveyance capacity of flood protection projects. These activities also provide access for maintenance personnel and equipment. The project includes: controlling in-stream vegetation growth, removing sediment at appropriate intervals, removing hazardous trees, and performing weed abatement and pruning to provide access and establish firebreaks. Before carrying out in-stream maintenance, District personnel perform biological pre-construction surveys to minimize environmental impacts. Allocations for Project E1 also helps fund future maintenance of flood protection projects completed under the Safe, Clean Water program.

This project is comprised of 4 sub-projects that support the District's ongoing vegetation control and sediment removal activities. Reference Appendix B in the 5-Year Implementation Plan for project descriptions. These sub-projects are:

E1.1 Vegetation Control for Capacity
E1.2 Sediment Removal for Capacity
E1.3 Maintenance of Newly Improved Creeks
E1.4 Vegetation Management for Access


  • Ensures that existing flood protection projects continue to provide maximum flood protection
  • Provides safe access for maintenance of creek channels
  • Reduces fire risk along creeks and maintains compliance with fire codes
  • Improves water quality

Project Status

(As of June 2017)

E1.1: Vegetation Control for Capacity
Completed 391 acres of in-stream vegetation management to reduce flood risk on 116 miles of streams throughout the county using an integrated combination of mechanical, hand labor and herbicide methods.

E1.2: Sediment Removal for Capacity
Completed 17 sediment removal projects, 83,792 cubic yards of sediment removed to maintain design capacity.
The Safe, Clean Water Program funds 14% of this work, which translates to approximately 11,730 CY.

E1.3: Maintenance of Newly Improved Creeks
As no Safe, Clean Water flood protection capital improvement projects have yet been completed, no maintenance work was conducted on newly improved creeks in FY17, and therefore, no expenditures have been made from the $19.1 million identified in the original 15-year plan. These funds will remain set aside for this project.

E1.4: Vegetation Management for Access
Completed 2,976 acres of maintenance access work in all five watersheds during FY17 relative to an annual target of 2,720 acres.
Of this total acreage, 15% of the completed work was funded by Safe, Clean Water.
During the first four years of the program, the total accomplishment for the program is 1,786 acres, compared to a four year target of 1,632 acres. To date, the program is on target for year four.

Key Performance Indicator

  1. Maintain 90% of improved channels at design capacity
  2. Provide vegetation management for 6,120 acres along levee and maintenance roads. 

Priority E-200

Project Information

StatusOn Target
Project StartFY 2014
Project FinishFY 2028
Safe Clean Water
Program funding

$59.2 M**

(2015 Dollars)

**More financial information: 5-Year Implementation Plan, pages: 19-27

For more information:



Smith Creek Upstream of Granada Way


Smith Before


Smith After