페이지 이미지
PDF
ePub

width was 145 feet. A very narrow channel of 20.6 feet could be traced through. The interruption to navigation for a vessel drawing 22 feet was 145 feet in length. With the exception of one small lump the 22-foot channel was 200 feet wide until a point was reached 1,270 feet from the present end of the east jetty; til a position is reachel 170 feet northerly from the end of the east jetty the least width of the 22-foot channel was 120 feet.

AUGUST 30, 1877. On the 30th day of Angust there was a 20-foot channel at average flood tide, which is the same as high title of August 30, through the bar at South Pass and throughout the pass and between the jetties. Its least width was 192 feet. A practicable channel of 20.8 feet was found; the interruption to navigation for a vessel drawing 22 feet was 114 feet in length.

Wherever found, that is with the exception of the interruption above noted, the 22-foot channel was at least 130 feet wide. The space lacking a 22-foot channel of the full width of 200 feet is about 900 feet in length. At low tide of August 30 these depths were lesseneil 1.1 feet. On August 29 a wide chanuel, 22.2 feet deep in its shallowest place, was found at the head of South Pass.

SEPTEMBER 29, 1877. On the 28th of September there was a 20-foot channel at average flood tide through the bar at South Pass, and throughout the pass and between the jetties. Its least width was 230 feet. A practicable channel of 20.7 feet was found. The interruptiou to navigation for a vessel drawing 22 feet was 85 feet in length.

Wherever found, that is with the exception above noted, the 22-foot channel was at least 110 feet wide. The space lacking a 22-foot channel of the full width of 200 feet is about 1,300 feet in length. At low tide of September 2 these depths were lessened 1.5 feet, and at high tide 0.7 feet. On September 25 a wide channel of 22.3 feet depth was found at the head of the pass.

NOVEMBER 1, 1877. On the 31st day of October there was a 20-foot channel at average flood tide through the bar at South Pass, and throughout the pass and between the jetties. Its least width was 210 feet. A practicable channel of 21 feet was found. The interruption to navigation for a vessel drawing 22 feet was 430 feet in length.

Wherever found, that is with the exception of the interruption above noted, the 22-foot channel was at least 160 feet wide. The space lacking a 22-foot channel of the full width of 200 feet is about 850 feet in length. At low tide of October 31 these deptlis were lessened 0.8 foot, and at high tide 0.5 foot. On October 24 a wide channel of 22.5 feet depth was found at the head of South Pass.

DECEMBER 2, 1877. On December 1 there was a practicable channel 21.3 feet deep in its shoalest part throughout South Pass to the deep water of the Gulf at average flood tide. A line 22.4 feet in depth could be traced through the bar to deep water.

The 20-foot channel was 212 feet wide and the 21-foot channel 120 feet wide at the narrowest contraction of each. The interruption to a practicable channel between 22 feet inside and the same depth outside was 90 feet in length.

At low water of the day these depths were lessened 1.6 feet and at high water 0.4 foot.

JANUARY 2, 1878. On Jannary 1 there was a channel 22 feet deep for a width of 200 feet at its narrowest point at average flood tide from the main Mississippi River through the jettied prolongation of South Pass to deeper water in the Gulf of Mexico. At the head of the pass the 22-foot channel was at least 264 feet wide. A practicable channel 22.4 feet deep exists from the main river to the Gulf. High tide of the day was nearly the same at average flood tide. At low tide of the day these depths were lessened about 1.7 feet.

FEBRUARY 4, 1878. February 2 there was a channel 22 feet deep at average flood tide from the main Mississippi River through South Pass jetties to deeper water in the Gulf of Mexico. Its least width was 190 teet.

A practicable chanuel at least 22.7 feet deep existed from the main river to the Gulf. At high tide of the day these depths were lessened 0.4 foot and at low tide 1.9 feet.

MARCII 4, 1878. March 4, 1878, there was a practicable channel 22.7 fert derp over South Pass bar, and from the main Mississippi River to the Gulf of Mexico at average flood tide. The tide remained on a stand, giving a depth of just 22 feet throughout the day.

The 22-foot channel at average tlood tide was at least 110 feet wiele, lacking the ful width of 200 feet for a length of 270 feet so far as is known or within the limit of survey, which covered all areas where a narrow channel is suspected.

APRIL 3, 1878. April 3 there was a channel 22 feet deep at average flood tide between South Pass jetties to deeper water in the Gulf of Mexico. Its least width was 70 feet, lacking a width of 200 fett for a length of 150 feet. A practicalle channel with a least depth of about 23 feet existed throughout the main pass and between the jetties. At high tide of the day these depths were increased 0.5 foot and at low tide lessened 0.8 toot.

At the head of passes a least depth of 21 feet at average Hood tide was found on the 19th of March. At the present stage of the river about 22 feet can be carried through the law of passes at high tide.

MAY 10, 1878. Mar Jat average flood tide there was a practicable channel between the South Pass jetties, and over the bar near their sea end, 23.2 feet (leep. The 22-foot channel was 210 feet wide. At high-water of the day the depths were three-tenthis greater and at low-water seven-tenthis less than at average tlood tide. A channel 24 feet deep, 250 feet in width, might be obtained by the immediate removal of 6,000 cubie yards of the bottom, provided that no deposition of sediment should be made simultaneously. Between a depth of 24 feet inside of the bar and the same depth outside the distance is 1-11 teet.

The length of channel lacking a depth of 24 feet for a width of 250 feet is 1,650 feet, including the 180 feet referred to just above.

At the head of South Pass the same date at average flood tide, there was a practicable channel 22.9 feet in depth. The 22-foot chamel had a least width of over 260 feet. At high tiile of the day these depths were increased about 1.7 feet. The reading for low-water of the day is not known. Rough water on the bar has prevented an earlier statemeut this month,

MAY 25, 1878. Mar 23 there was a practicable channel over South Pass har at the ends of the jetties with a minimin depth of 22.3 feet, if the pilot can avoid a small lump west of the deeper channel having on it 21.5 feet.

The deepest line of water along a curve had a minimum depth of 23.2 feet.

JUNE 4, 1878. Jime 3. at average flood tide, there was a practicable channel 22.2 feet deep throughout South Pass and between the jetties to deeper water of the Gulf.

The least width of the 22-foot channel was 100 feet.
At high tide of the day these depths were increased 1.0 foot and at low tide 0.8 foot.

Between 24 feet depth inside of the bar and the same depth outside the distance was 110 feet. The length of channel lacking a depth of 24 feet for a width of 250 feet was 1,100 feet.

By the immediate removal of 4,400 cubic yards from the bottom, a channel 24 feet deep, 250 feet in width might be obtained.

June 3 a practicable channel 22.9 feet deep was found at the head of passes at average flood tiile. At high tide of the day this depth was increased 1.6 feet and at low tide 0.5 foot.

JUNE 20, 1878. Jue 19 there was a 22-foot channel at average flood tide thronghout South Pass and between the jetties to deeper water in the Gulf. Its least width was 160 feet. At high tide of the day this depth was increased 0.4 foot and at low tide lessened 0.6 foot.

Between 24 feet depth inside and the same depth outside the least distance was 180 feet. The length of channel lacking a depth of 24 feet for a width of 250 feet was 870 feet.

JULY 4, 1878. July 2, at average flood tide, there was a channel over South Pass bar 21.9 feet deep, having a least width of 150 feet. At high tide of the day depths were increased 1 foot, and at low tiile lessened one-half a foot. Two small lumps, or one larger, if they comect, prevented the existence of a channel 23 feet deep at average flood tide.

FINANCIAL.

$1, 830 27

Amount available from appropriation for “ Examinations and surveys at

South Pass of the Mississippi River," July 1, 1877 ...
Amount allotted from appropriation for “Examinations, survers, and con-

tingencies of rivers au harbors," during the fiscal year ending Jue 30,
Amout expended during fiscal year ending June 30, 1978.
Amout available July 1, 1878,
Amount required for tiscal year ending June 30, 120.

9, 400 00 11, 230 27 15, (100) 24, 000 000

Estimate of funds required for examinations and surreys at South Pass of

the Mississippi River for the fiscal year en ting June 30, 1950. Pay of eight first-class seamen and two steam-engineers, and provisions $9, 875 00 Tlıree assistant engineers

5, 100 00 Purchase of a second small steam-launch, to be used in checking cost of

constructions, under act of Congress approved June 19, 1878, and for other purposes

2. 050 00 Repairs to old steam-launch

1, 3:30 00 Renewal and repair of row boats, cost of surveying apparatus, &c

1, 130 00 Traveling expenses, light chemical apparatus, and chemicals...

1, 000 00 Materials for running launch and comucting surveys-oil, rope, buoys, bunting, lumber, spikes, &c.

720 00 Coal for launches and office..

1, 230 00 Stationery and supplies for drafting, tide-gauge paper, &c

580 00 Photolithographing

450 00 Freight, telegrams, and express charges.

300 00 Office rent

300 00 Two water-level observers...

240 00

Total for 1879–80......

24, 805 00 Very respectfully, your obedient servant,

M. R. BROWN.

Captain Engineers, U. S. A. ACTING CHIEF OF ENGINEERS, U. S. A.,

Washington, D. C.

[ocr errors]
« 이전계속 »