Re: {Tidal Potomac Fly Rodders} Four Mile Run - Flood Management

That's actually great news. I've fished four mile run a handful of times when I lived in Arlington with varied luck. It'll be nice to have a lot of deeper holes to fish in once they've completed the project.

On Mar 24, 2021, at 10:13 AM, Rob Snowhite <rob@robsnowhite.com> wrote:

I'm really looking forward to this. The Army Corps built the current itiration of Four Mile Run in the 70s after Agnes came through. Due to erosion and sand on streets in winter the area of 4MR that is designed to absorb flood water has filled in. The section between Mt. Vernon and Rte 1 will be dredged to remove sediment and allow the Army Corps to adjust the flow. 

I'm sure the wildlife will be fine. There isn't much other than clams in the sediment. Otters and birds will return once the equipment is gone.  I'm looking forward to deeper water that fish will explore. 

Rob Snowhite

On Wednesday, March 24, 2021, 10:10:46 AM EDT, Cody Schultz <cody92schultz@gmail.com> wrote:

It looks like they will be dredging 4MR in late summer or early fall.  I'm newer to the area, but are efforts like this the extent of solutions to combat flooding?   Also since this isn't the first dredging they have done at 4MR, what are the general wildlife impacts (fishing and otherwise) that you have seen?

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Four Mile Run flood channel maintenance agreement 

The County Board approved an intergovernmental agreement with the City of Alexandria for the two jurisdictions to share maintenance costs and the dredging of the two-mile Four Mile Run flood channel, which extends from Shirlington to the Potomac River.  The channel straddles the boundary between the County and the City of Alexandria.

Maintenance of the open channel includes clearing debris, sediment and vegetation, and re-stabilizing stream banks as required by the United States Army Corps of Engineers (USACE) annual inspection program. The two jurisdictions have agreed to a 50-50 split of the costs of the dredging, which will help preserve the flood channel's capacity and reduce flood risk in neighborhoods surrounding South Four Mile Run.

The work will begin in late summer or early Fall, 2021 and take approximately four months. The Four Mile Run Levee System, a USACE flood risk management project, was completed in 1984 in response to several devastating floods in South Arlington. The Board voted unanimously to approve the agreement. To view the staff report, scroll to Item No. 26 on the agenda for the Saturday, March 20, 2021, County Board Meeting agenda.

Previous dredging of Four Mile Run Channel

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