2. A careful survey of the locality has just been made. Map (UR 88) resulting therefrom is herewith as Inclosure No. 1. Herewith, also, as Inclosure No. 2, is a set of small scale maps of earlier surveys, since May, 1925, inclusive. This set includes also a sheet showing the location of the mid-channel lines as they existed at the times of the May, 1925, to February, 1928, surveys. A set similar

to Inclosure No. 2, but showing surveys from 1850 to 1924, inclusive was forwarded with second indorsement on E. D. 7245 (Umpqua R.)-11, dated March 17, 1925. No copy of this set is herewith.

1

3. The maps referred to above have been studied in connection with the matter under consideration, and certain composite maps prepared, viz: Inclosure No. 3, Map (UR 89) showing high and low water lines 1903 to 1928. Inclosure No. 4 Map (UR 90) showing high and low water lines and 12-foot hydrographic contours from surveys of May, 1924, and February, 1928. There is also inclosed map on large scale of the survey of May-June, 1924 (UR 65-1), marked "Inclosure No. 5." Attention is invited also to U. S. C. & G. Chart No. 6004, a section of which is herewith as Inclosure No. 6.1

4. A study of the situation indicates that, while some surface. changes have taken place on south beach, the underwater area along that beach has in general filled in during recent years. This may be noted by reference to inclosure No. 4. Conditions now appear to be better than they were in 1924, when the ship channel followed close to the south beach, the axis being but 600 to 1,200 feet from the low-water line along that beach, while in February, 1928, the axis lay closer to the north jetty, and some 800 feet north of the 1924 axis. The extension of the north jetty, made in the interim, may be credited with the improvement.

5. It is my opinion that the surveys show the north jetty, as extended to date, to have justified the opinion expressed in paragraph 11 of House Document No. 320, as quoted above, and that further extension about to be made will serve to afford additional justification. It is, further, my opinion that the changes that have occurred are an argument in favor of adhering to a single jetty and dredging as the correct treatment for the entrance. While this opinion is based mainly on economic grounds, and a two-jetty improvement would likely be the correct engineering treatment if economic consideration could be ignored, the effect of the north jetty, as built to date and with the extension planned, supplemented by dredging, if needed, holds enough promise of success to justify indefinite postponement of south jetty construction. Experience with single jetties at the entrance to Coos Bay and at Tillamook Bay indicates that a single jetty will fix the direction of the channel across the ocean bar and will maintain depths from 18 to 20 feet throughout the year. Both of those jetties secured the project depths when they were first constructed; but, as they were not maintained and were not extended as the ocean bar moved seaward, they soon lost control of the ebb currents, which spread out soon after they pass the end of the jetty enrockments. (At Coos Bay the project depth was later increased

1 Not printed.

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to not less than 25 feet, which could not be maintained by a single jetty, and a second jetty was authorized.)

6. It is recommended that in deciding whether a south jetty at Umpqua River entrance should be authorized very serious consid eration be given to the likelihood of a movement of the bar seaward as a result of jetty influence, which would entail extension of the jetties at enormous cost in deeper and exposed waters. Even the single jetty at this entrance has advanced the bar about 400 feet. Restoration of the jetties after a lapse of a few years, in addition to the probable extension, may confidently be expected to be necessary.

G. R. LUKESH, Lieutenant Colonel, Corps of Engineers, District Engineer.

REPORT FROM THE CHIEF OF ENGINEERS ON PRELIMINARY EXAMINATION AND SURVEY OF WADDINGTON HARBOR, N. Y.

May 22, 1928.-Referred to the Committee on Rivers and Harbors and ordered to be printed, with illustration

WAR DEPARTMENT, Washington, May 19, 1928.

The SPEAKER OF THE HOUSE OF REPRESENTATIVES.

DEAR MR. SPEAKER: I am transmitting herewith a report dated May 18, 1928, from the Chief of Engineers, United States Army, on preliminary examination and survey of Waddington Harbor, N. Y., authorized by the river and harbor act approved January 21, 1927, together with accompanying papers and map.

Sincerely yours,

C. B. ROBBINS, Acting Secretary of War.

Subject: Preliminary examination and survey of Waddington Harbor,

N. Y.

To: The Secretary of War.

1. I submit, for transmission to Congress, my report with accompanying papers and map, on preliminary examination and survey of Waddington Harbor, N. Y., authorized by the river and harbor act approved January 21, 1927.

2. Waddington Harbor is located on a side channel of the St. Lawrence River south of Ogden Island. It is about 18 miles downstream from Ogdensburg, N. Y. There is an existing project which provides for a channel 11 feet deep and 200 feet wide through the bar in Little River at the head of Ogden Island, and for a channel near

106350°-H Doc. 322, 70-1