EP 1130-2-520
29 Nov 96
(d) The tabulations of depths should be amplified by footnotes or otherwise to show
clearly and definitely the location of controlling shoals, tendency of shoals to recur, and all other
critical information of special value and importance for safe navigation of the channel. Reaches of
channel not presently named should be identified in the tabular form by reference to charted aids
or features, or assigned identifying names, numbers or letters. For localized irregular project
areas where the application of the tabular form would not be practical, the controlling depth based
on a safe navigable width will be described as well as unusual or critical conditions of shoaling.
h. Charts will be updated and re-published on a regular basis. Update intervals will be
based on the nature of the waterway and extent of changes, but will not exceed every seven years.
i. A NTNI will be disseminated approximately six months in advance of availability of a
revised chart edition.
2-6. Special Reports.
a. Changes affecting navigation will be made promptly whenever information of
immediate concern to navigation becomes known. Refer to ER 1130-2-520 for the circumstances
requiring special reports. Items of information especially desired are: (1) channel condition as
revealed by surveys; (2) changes in channel conditions, either by natural causes or by dredging or
other work; (3) changes in approved projects for improvement with statements of results expected
from proposed-operations; (4) descriptions of proposed dredging or other Federal work of
improvement such as breakwater, pier, and revetment construction or alterations; (5) descriptions
of proposed or completed municipal or private improvements in or affecting navigable waters; (6)
accidents or equipment failures at USACE locks and dams or along navigable waterways, that will
result in closure of the lock or waterway for 24 hours or more, or will result in a significant
impact to navigation. For item (6), district commanders are to forward an incident report to
HQUSACE (CECW-OD) through their MSC office as soon as possible following the incident.
Reporting of navigation incidents to CECW-OD is required even though the districts may be
sending situation reports to the HQ Emergency Operations Center during natural disasters or
more regional or localized events.
b. Additional items of information desired are: descriptions of wrecks; uncharted shoals,
and other obstructions to navigation and particulars as to proposed or completed removal of
same; changes in buoys or lights; erection of new, or changes in existing bridges; new or revised
Federal or local rules and regulations for harbors and channels; establishment or existence of
danger areas in navigable waters. Reproductions of drawings or sketches which will be helpful
in interpreting the data shall accompany the reports. The reports will not be limited to a
reference to an accompanying drawing or sketch, but will contain a complete description in form
suitable for publication in notices to mariners and the monthly supplements to the U.S. Coast
Pilot. In this respect, the reports will provide enough information that a single notification to
navigational interests will suffice. In the case of dredging or construction work, the mere
statement that work will commence or has commenced on a certain date is insufficient. All
additional information possible, such as probable duration of operations and object of work, will
be given. In the case of dredging, extent of the area to be dredged and the depth expected will be
provided. The reports required by this paragraph will be identified by reference to the appropriate
engineer manual or regulation and will be numbered consecutively by each district during the
calendar year, starting with number 1 at the beginning of each year.
2-6
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