Accotink Tributary at Danbury Forest Stream Restoration (SD000031-179)
Project Update: October 27, 2023
The construction contractor for the project, Avon Corporation, Inc., was given Notice to Proceed on October 21, 2022. The construction contract duration is set at 500 calendar days. Substantial completion is scheduled for April, 2024. The Lake Accotink Trail will remain open during construction. Warning and stop signs are posted for construction vehicles requiring them to stop and wait for the trail to clear before proceeding. Trail users are advised to also look out for construction vehicle traffic along the paved portion of the Lake Accotink Trail. The paved trails within the Danbury Forest Community Association will be closed along the floodplain between Kirkham Ct., Mitcham Ct. and Danbury Forest Dr. for much of the construction duration to allow for construction access, replacement of the existing asphalt trails used for construction access and replacement of the pedestrian bridge.
The tributary to Accotink Creek is in the Accotink Creek Watershed, upstream of Lake Fairfax. The existing channel is eroded and actively downcutting and widening. The stream receives flow from several stormwater outfalls that convey water from the surrounding neighborhoods, schools and commercial areas. The project was identified for implementation in the Accotink Creek Watershed Management Plan. In March of 2017 staff of the Stormwater Planning Division initiated the design of the project and coordination with the Danbury Forest Community Association.
The project will restore approximately 4,000 linear feet of a tributary to Accotink Creek within the Danbury Forest neighborhood, upstream of Lake Accotink. The stream restoration plan utilizes Natural Channel Design (NCD) techniques to create a stable channel cross section, longitudinal profile and planform geometry for the severely degraded stream channel. NCD restores a degraded stream by mimicking the characteristics of a stable, natural stream. Through the use of geomorphic principles, NCD achieves long-term, self-sustaining stability given current and future flow rates. The project will improve water quality by restoring the ability of the stream and riparian corridor to biogeochemically process phosphorous, nitrogen and sediment. These water quality benefits will be achieved by stabilizing the channel, installation of grade control structures, floodplain connectivity, enhancement of the hyporheic zone, incorporation of large woody debris into the channel substrate and native landscape plantings.
The project is located in the Braddock Magisterial District, within the Danbury Forest neighborhood, in the Accotink Creek Watershed.
The project is in the Construction Phase
Restore and maintain aesthetic and recreational benefits for County residents
Protect and improve water quality in Accotink Creek, the Potomac River and Chesapeake Bay, and help to meet regulatory requirements
Reduce streambank erosion
Protect at-risk infrastructure (utilities, trails and footbridges)
Establish a stable stream and riparian buffer that will be planted with a diverse mix of native vegetation
Improve ecological functions and processes of the stream and riparian area
Total Suspended Solids load reduction of 188,265 lbs/yr
Total Phosphorous load reduction of 586.27 lbs/yr
Total Nitrogen load reduction of 1,432.78 lbs/yr
Construction Start: October 2022
Construction Completion: April 2024
What To Expect
Installation of a staging and stockpile area on the floodplain, adjacent to the Driveway Road off of Rolling Road. Installation of fencing to define the project’s limits of disturbance and tree protection areas. Installation of timber matting along the construction access pathways to protect trees and utilities. During construction, equipment and materials will be transported along the Driveway Road at 5701 Rolling Road to the staging and stockpile area and then along the construction access pathways on the floodplain and the Dominion right of way to the active construction areas along the channel. Signage for construction vehicles access will be posted along the Driveway Road, which is an extension of Lake Accotink Rail Trail.
Construction activities will occur throughout the week starting after 7 a.m. on weekdays. Note that at some periods during construction work may occur on weekends after 9 a.m. Construction activities are permitted until 9:00 pm throughout the week and weekend.
For more information, please contact Justin Pistore, Project Manager II, Justin Pistore, Watershed Projects Implementation – Central, Stormwater Planning Division, Department of Public Works and Environmental Services, or call 703-324-5685, TTY 711.