Nav Zone
Update on High Water
Spillways:
The Bonnet Carre Spillway was partially opened on Monday, May 9, 2011 in order to keep the volume of the Mississippi River flows at New Orleans from exceeding 1.25 million cubic feet per second (cfs). Currently a total of 330 bays of the 350 are open moving approximately 316,000 cfs of water through the structure.
The Morganza Floodway was opened on Saturday, May 14th with two gates to start, and as of Monday, May 16th, a total of 15 of 125 gates were opened.
Click here to see video on the opening of the Morganza Floodway.
River Gages:
Baton Rouge: Currently 44.6, expect to crest at 45.0 on May 18th
Morgan City: Currently 7.7, expected to crest at 11-13 on May 25th
Reserve: Currently 23.8 and cresting
New Orleans (Carrollton): Currently 17.0 and cresting
Waterway Report:
The Coast Guard said it closed the Mississippi River at the port in Natchez, Miss., because barge traffic could increase pressure on the levees. Several barges were idled at Natchez at the time of the closure, and many more could back up along the lower Mississippi
Atchafalaya River: North of Mile Mark 117AR (Morgan City Railroad Bridge) to Mile Mark OAR (Simmesport, LA) on the Atchafalaya River is closed to all commercial traffic.
The Morgan City - Port Allen Alternate Route is closed to all commercial traffic.
Bayou Chene: The Bayou Chene waterway from Bayou Penchant north to the GIWW is closed to all vessel traffic.
Algiers, IHNC and Harvey will have to close when gage at Carrollton reaches 17.5 feet, thought it is expected to stay below this stage due to the opening of the Bonnet Carre Spillway and the Morganza Floodway.
GIWW MM 99WHL: the intersection between the Atchafalaya River and the GIWW will be subject to additional traffic restrictions when the current reaches 3.5 knots. The restrictions will include: a max tow length of 600 feet, hp will be three times the length of the tow, all red flag barges are required to have an assist tug regardless of length.
Wax Lake Outlet: for currents greater than 3.5 knots the following restrictions will be in place: max tow length of 600 feet, will be three times the length of the tow, all tows of 400-600 feet will have an assist tug of at least 900 hp, red flag barges are required to have an assist tug regardless of length.
GIWW MM57WHL to MM62WHL: Durlarge Bridge and Houma Navigation Canal intersection will be restricted when the river reach 3 feet or 3 knots. Restrictions will be: max tow of 600 feet, will be three times the length of the tow,
USCG Navigation General Questions
A current perpendicular to a vessel's track has the greatest effect on the vessel's course made good _________.
A: at high vessel speeds B: at low vessel speeds C: in shallow water D: in deep water
In addition to the National Weather Service, what agency provides plain-language radio weather advisories for the coastal waters of the United States?
A: National Imagery and Mapping Agency B: U.S. Hydrological Survey C: U.S. Coast Guard D: American Meteorological Service
The four standard light colors used for lighted aids to navigation are red, green, white, and _____________.
A: purple B: orange C: blue D: yellow
When daylight savings time is kept, the time of tide and current calculations must be adjusted. One way of doing this is to _____________.
A: add one hour to the times listed under the reference stations B: subtract one hour from the time differences listed for the subordinate stations C: apply no correction as the times in the reference stations are adjusted for daylight savings time D: add 15ø to the standard meridian when calculating the time
You are running parallel to the coast and plotting running fixes using bearings of the same object. You are making more speed than assumed for the running fix. In relation to the position indicated by the fix you will be _____.
A: closer to the coast B: farther from the coast C: on the track line ahead of the fix D: on the track line behind the fix
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