Green Alley Project

Basic Project Overview
The City of Fort Bragg and the California Water Resources Control Board are partners on the Green Alley Project.  The goals of the Green Alley project are to increase the amount of storm water that can be absorbed in place, and to filter that it to reduce the pollution from cars that enters local wetlands. This project will be built in summer 2015 at 2 city alleys and at 5 city storm drain inlets.  Locations for project elements are: 

  • Purity Alley between Franklin & McPherson from Redwood to Alder
  • South Alley between Harrison and Whipple, running from Oak to Madrone 
  • 5 storm drain inlets will be retrofit: 2 on Whipple Street, 2 at VFD parking lot, and 1 in the alley east of Harold Street and south of Oak Street.
  • Columbi Alley between Oak & Madrone from Corry to Harold
  • Minnesota Alley from Willow, south halfway to Chestnut, east of the CV Starr Center

Technical Project Overview
A grant was received from the State’s Water Resources Control Board for ($643K) the purposes of demonstrating beneficial effects of Low Impact Development (LID) on urban receiving waters. LID tools are encouraged by California and other states to improve water quality in our local receiving waters while reducing the need and costs associated with conventional storm water infrastructure (curb and gutter, storm water conveyance piping) needed to drain storm waters from hardened urban areas. The hard surfaces common in urban areas (streets and buildings) have inadvertently become barriers to water infiltration, percolation, and groundwater recharge.

The purpose of the Green Alley project is to demonstrate LID concepts by infiltrating urban storm water now running off City streets and alleys.  Infiltrating urban runoff will allow earthen particles and the microbial community in underlying soils to filter out typical urban pollutants, like motor oil and bacteria, and minimize the amount of these pollutants that enter nearby surface waters.  This approach is meant to revive natural conditions before urbanization when native soils absorbed a greater portion of rainfall and runoff and allowed for downward percolation of storm water to recharge the groundwater table and feed our surface waters during long dry summers.  Repaving with permeable pavements is meant to demonstrate that we can improve the aesthetics and serviceability of alley conditions while also recharging groundwater and improving the quality of nearby surface waters. 

The alleys chosen were chosen because they were slated for LID. Not all of the alleys in town are able to utilize LID due to the depth of utilities, etc.

2015 Green Alleys map (air photo)