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Entergy to US Coast Guard Notice Form has Waterford Nuclear Safety Zone at Wrong River Mile Marker:
U.S. Coast Guard: Refer to Emergency Management Resources Book Offsite Response Agencies Section

We request the establishment of a safety zone in the immediate area of Waterford 3 to control marine traffic, in accordance with your letter of agreement. Waterford 3 is located at mile marker 128.” (Entergy)

Entergy cooling water intake is at 129.4 and 129.8. Entergy Reactor and Discharge is at 129.8. 128.1 is Union Carbide.
Waterford mile marker uS Army Corps
For the lower Mississippi zero is near the mouth and the miles are larger going upriver to Cairo, IL.

Maybe it’s been corrected by now. Maybe not. We found no updates. And nothing ever changes much in that region.

This notification is probably to help protect Mississippi River traffic in the event of a nuclear accident.

Proper location matters for water intake in the context of accidents and spills. See: https://lasinkhole.wordpress.com/2016/01/27/barge-crash/
Also, it may matter for emergency services by water as they are used in navigation.

Entergy Coast guard form

US Coast Guard on Recent accident in area:
UPDATE: Coast Guard reopens Mississippi River with restrictions near Hahnville Wed, 01/27/2016 – 11:07
NEW ORLEANS – The Coast Guard has reopened the Mississippi River to one-way traffic from mile marker 127 to mile marker 129 to all vessels, near Hahnville, Louisiana.

The Mississippi River was closed Tuesday in response to a collision between two towing vessels near mile marker 129 on the Mississippi River. One barge carrying caustic soda capsized in the river.

The capsized barge has been secured. The Coast Guard & the Port of South Louisiana are monitoring the area for any changing conditions that could affect vessel traffic.

High-water restrictions and advisories for the Sector New Orleans Captain of the Port Zone are still in place. For more details on these limitations, please visit https://homeport.uscg.mil/nola.

The cause of the incident is under investigation.http://www.d17.uscgnews.com/go/doc/4007/2780198/

Coast Guard responds to barge collision near Hahnville
Jan 26th, 2016 ·
NEW ORLEANS – The Coast Guard is responding to a barge collision between two towing vessels near mile marker 129 on the Mississippi River near Hahnville, Louisiana.

The Mississippi River has been closed from mile marker 126 to mile marker 131.

The Coast Guard is working with state & local agencies and the responsible party to recover one capsized barge carrying caustic soda in an effort to reopen waterways.

There have been no reports of caustic soda entering the water.

There were no reported injuries.

The cause of the incident is under investigation.

Tags:barge collisionhttp://coastguardnews.com/coast-guard-responds-to-barge-collision-near-hahnville/2016/01/26/

Text of Location
River Miles Waterford etc text
Entergy Cover Letter:
Entergy 2003 cover for coast guard safety

USGS Map of area
Usgs Waterford mile marker