throughout the existence of the structure which it marks, whether or not nets are attached, until the last pole of the structure has been removed. The light shall be fixed at an elevation at least six feet above normal high water, and shall be visible in clear night weather for a distance of one mile from all points of the compass and from the air. The light shall be subject to inspection and approval by the District Engineer before and at any time during use. The owner shall make provision for its proper attendance, so that it shall be in effective condition and properly lighted. The owner of each fish net structure shall provide such additional lights as may be prescribed by the United States Coast Guard. Fish net structures situated more than 100 yards away from any established fishing structure limits, fairway, or navigation lane in the following localities need not be lighted except as may be required by the United States Coast Guard: Mobjack Bay; the western portion of Chesapeake Bay south of a line from New Point Comfort Light to Can Buoy 9A and north of an east-west line through Old Point Comfort Light; York River; and James River upstream from longitude 76°35'. In these localities the channelward ends of fish net structures which are within 100 yards of any fairway or navigation lane shall be marked with a light conforming to the requirements set forth in this paragraph.

(2) Crab pots. Each crab pot shall be marked by a buoy made of cork or other buoyant material of such size and color as to be readily discernible from a distance of 200 feet under normal weather conditions. The line securing the buoy to the trap shall be rope of cotton or similar material and shall not exceed one-fourth inch in diameter.

(3) Oyster ground markers. Oyster ground markers shall be of such size and type and shall have such markings as may be prescribed by the laws of the State having jurisdiction.

(d) Location—(1) Fishing structure limits. The geographic positions of control points marking the established fishing structure limits are given in

paragraphs (e) and (f) of this section, and the limits are shown on United States Coast and Geodetic Survey charts. Positions of intermediate points marking the fishing structure limits which are not given may be found by referring to the charts. The points listed are connected by straight lines unless otherwise indicated. Fishing structure buoys, which are special buoys painted with horizontal black and white stripes, have been placed to mark the fishing structure limits, and regular aids to navigation are used in conjunction with the fishing structure buoys where possible. Aids to navigation used as control points may be renumbered or shifted by the Coast Guard. In such cases the fishing structure limits do not change, and the location of the control point remains fixed at the geographic position indicated. The fishing structure buoys are identified by a series of letters and numbers. The first letter preceding a number indicates the body of water, as "J2" for James River and "H2" for Hampton Roads, for buoys in the Norfolk District The letter "B" following a number, as "1B" and "2B", indicate buoys in the Baltimore District.

(2) Oyster ground markers. Oyster ground markers may be placed outside or channelward of established fishing structure limits under such conditions as may be prescribed by the District Engineer.

(3) Fishing structures other than oyster ground markers. In localities where fishing structure limits are established, fishing structures other than oyster ground markers shall not be placed outside or channelward of such limits. In localities where fishing structure limits are not established, such structures shall not be placed in dredged or natural channels or other lanes used by watercraft, or within 200 feet of the edge of any dredged channel. A clear fairway at least 200 feet wide shall be maintained from navigable channels to established boat landings. Such structures shall not be placed within 500 feet of any aid to navigation other than fishing structure buoys. The approach to the mouth of any navigable tributary or to the mouth of any navigable branch of

any tributary shall be left free and unobstructed. Where fishing structure limits are not established, this free and unobstructed approach shall lie along the channel usually followed by boats and shall have a width of not less than one-third of the width of the mouth of the tributary or branch. Within the navigable tributaries where fishing structure limits are not established, a channel in deep water of at least one-third of the total width of the waterway at the locality shall be left free and unobstructed.

(e) Baltimore District-(1) West side of Chesapeake Bay north from Cove Point to Middle River.