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Amount appropriated by act of July 11, 1870..
Amount appropriated by act of February 2, 1871.
Amount appropriated by act of March 3, 1871..

Amount expended during the fiscal year ending June
30, 1871..

Amount available July 1, 1871

Amount required for fiscal year ending June 30, 1873....

(See Appendix C 1.)

$150, 000 00

100,000 00

250,000 00

108,318 41

391,681 59 885,000 00

2. Cheboygan Harbor, Michigan.-In compliance with the act of July 11, 1870, a survey was made by Captain Farquhar, and an estimate submitted for this improvement. He suggested, should it be determined to improve this locality, dredging a channel from 100 to 200 feet wide and 14 feet deep to reach the same depth of water in the lake, following the natural channel of the river as far as it goes, and continuing thence in a direction perpendicular to the shore-line of the lake. He estimated the cost of such improvement at from $334,000 to $395,000, according to the width adopted, including pier-head and sheet-piling and revetment on the sides of the cut.

The appropriation of $10,000 by the act of March 3, 1871, towards this improvement, being so small, it has been decided to expend it in dredging between the locality of the piers as proposed in the above plan, but to diminish the width and reduce the depth of the cut to 9 feet.

The work of dredging is now in progress under contract. It is believed that all the dredging immediately necessary can be done during the next fiscal year for $50,000.

(See Appendixes C 2 and C 7.)

3. Improvement of Au Sable River, Michigan.-Work performed during the eary part of the year consisted of repairing and replacing the 18-foot wide crib at the outer end of the north pier. This pier was also levelled up and the superstructure on it finished, the height above mean low water being 5 feet. Except the outer crib, this work has stood well. Several cribs have settled to some extent, caused by the scouring action of the current, which, however, has resulted in increasing the depth of water along the harbor face at the south pier. Some damage has also been sustained by the passage of heavy rafts, catching on the south pier and tearing off timbers as well as by drift-logs pounding upon it. Much of this difficulty will be obviated when the superstructure now in progress is built. A marked improvement is visible in comparing the depth of water in the channel with that of previous years. The river inside shows an average depth of 11 feet.

The recommendation of last year to extend the piers is renewed. Under the appropriation of $10,000 approved March 3, 1871, a contract has been made for the superstructure of the south pier.

Amount on hand July 1, 1870....

$9,089 63

Amount appropriated by act of July 11, 1870.

15,000 00

Amount appropriated by act of March 3, 1871..

10,000 00

Amount expended during fiscal year ending June 30, 1871. 24, 403 75 Amount available July 1, 1871....

9,685 88

All of which is pledged under existing contracts.

Amount required for fiscal year ending June 30, 1873.....

35,000 00

(See Appendix C 3.)

.4. Improvement of Saginaw River, Michigan.-This improvement is in an efficient state, and continues to prove valuable.

No further appropriations are at present required.

5. Harbor of refuge on Lake Huron.-The point on the shore of Lake Huron south of Point aux Barques, known as Port Hope, is recommended by Major Poe for the site of the proposed harbor of refuge, after a careful examination of the three localities named in his preliminary report of January, 1871.

Repeated borings at all three localities with an apparatus made efficient and trustworthy after many trials, established the existence at Port Hope of good holding-ground, better, even, than that at Sand Beach Bay; and as the locality possessed the requisite condition of near proximity to Point aux Barques, it was recommended by Major Poe, who, however, requested that the subject might be submitted to a board of engineers of high rank, before a final decision was made. As this request was in accordance with my own views, and was approved by you, a board of engineers, experienced in lake-harbor constructions, was at once convened and ordered to make personal examination of Port Hope and Sand Beach Bay, and report their views as to the site best adapted to meet the wants of navigation. Their report will be submitted to you as soon as received.

The design submitted by Major Poe aims to make the required protection from the sea by constructing a breakwater in the ordinary form of wooden cribs, filled with ballast stone. This breakwater, it is proposed, shall be 2,500 feet long, parallel with the shore-line; thence from the northern end a wing of the same character, to extend 1,500 feet toward the shore. In addition, it is proposed to construct on the north a smaller breakwater, its eastern end being southwest and distant 500 feet from the west end of the wing of the main breakwater, and its length 800 feet, extending toward the shore.

The estimated cost of the main work is
And for the auxiliary breakwater is

Total...

$449, 744 71 28,000 00

477, 744 71

As the cost of a harbor at either of the two points, Port Hope or Sand Beach Bay, will largely exceed the present appropriation of $100,000, the additional sum of $200,000 is recommended for appropriation at the next session of Congress.

6. Survey and estimate for removing middle ground at the mouth of Black River, in Saint Clair River, Michigan. This survey was directed by the act of March 3, 1871, and was completed during the year; a map, with detailed estimates for improvement, having been submitted. The officer in charge proposes building a dam across Black River and dredging out a new channel at its mouth at a cost of $66,924. His estimate for the removal of the middle ground to a depth of 15 feet, (involving the excavation of 168,300 cubic yards gravel at 40 cents,) is $67,320.

To obtain a depth of 18 feet requiring the excavation of 393,800 cubic yards, at 40 cents, $157,520.

(See Appendix C 5.)

7. Improvement of Clinton River, Michigan.-The appropriation of July 11, 1870, ($5,000,) was expended under contract during the past year, and resulted in obtaining a channel 2,700 feet long, with an average width of 98 feet at top and 58 feet bottom, and depth of 9 feet. The sum appropriated by the act of March 3, 1871, will be expended

dering the present season in making a survey of the improvement with the view of adopting the necessary measures for maintaining its efficiency.

No appropriation is recommended for the next fiscal year.

See Appendix C 6.)

8. Examination of the mouth of Pine River, Saginaw Bay, Michigan.-— This is a small stream emptying into Saginaw Bay, on its northern side. It has a depth of about 7 feet for a width of less than 100 feet, with only feet on the bar at its entrance.

A harbor here can be of no general importance, and is not required as a harbor of refuge. A channel, to be useful, should be at least 100 feet wide at top and 7 feet deep. To dredge this will cost about $7,500. The officer in charge made no estimate for piers, because the cost of building them is not warranted by the existing commerce of the place.

IMPROVEMENT OF THE SAINT CLAIR FLATS, LAKE SAINT CLAIR.

Agent in charge, Colonel Thomas J. Cram, Corps of Engineers, (retired.)

Saint Clair Flats Canal.-This work was completed and opened to the public on the 25th July, 1871.

A small force is kept at work during the season as a precaution in watching and caring for the newly made embankments, under the direction of the custodian in charge.

An appropriation will be required for the fiscal year ending June,

1873.

For wages of the custodian and for contingent repairs, $2,500. (See Appendix C 8.)

HARBORS ON LAKE ERIE WEST OF DUNKIRK,

Officer in charge, Major Walter McFarland, Corps of Engineers, to April 25, 1871, since which time Captain George L. Gillespie, Corps of Engineers.

1. Monroe Harbor, Michigan.—During the year 8,000 cubic yards have been removed from the bar at mouth of the ship-canal, giving a good 12-foot channel into it.

Amount on hand July 1, 1870.....

Amount expended during the fiscal year ending June 30,

1871....

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$6,253 71

6,101 60

152 11

(See Appendix D 1.)

2. Harbor of Toledo, Maumee Bay, Ohio.-The improvement of the Western channel by dredging has been carried on during the season. The excavation amounts to 54,573 cubic yards on June 30.

The balance on hand June 30, 1871, will be expended during the present

fiscal year.

Required during the fiscal year ending June 30, 1873, to complete this dredging as contemplated, $20,000.

Amount on hand July 1, 1870..

Amount appropriated by act of July 11, 1870.

Amount appropriated by act of March 3, 1871...

Amount expended during fiscal year ending June 30, 1871.

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Amount available July 1, 1871..

Amount required for fiscal year ending June 30, 1873....

(See Appendix D 2.)

$100, 879 31 20,000 00

3. Sandusky River, Ohio.-No further improvement of this river has been made since June 30, 1869, for the want of funds.

An appropriation of $20,000 could be profitably expended in widening the present channels through the bars of this river.

4. Sandusky City Harbor, Ohio.-The contract made in September, 1869, for dredging the inner channel of this harbor was completed in November, 1870, resulting in the removal of 28,192 cubic yards of material, in a cut 60 feet wide and 2,500 feet long.

The appropriation of July 11, 1870, ($10,000,) will be expended this season in excavating about 25,000 cubic yards from the channel cut in inner bar, in a cut half a mile in length and 90 feet in width. No appropriation is recommended for the next fiscal year.

Amount on hand July 1, 1870..........

$9,749 81

10, 000 00

Amount appropriated by act of July 11, 1870.
Amount expended during fiscal year ending June 30, 1871.. 10,604 56
Amount available July 1, 1871...

(See Appendix D 4.)

9, 145 25

5. Huron Harbor, Ohio.—The east and west piers of this harbor have been repaired. They are now in good condition and the channel-way full 15 feet depth of water at low stage.

No appropriation for the next fiscal year is required except $1,000 as the probable annual cost of keeping the piers in repair. Amount on hand July 1, 1870....

Amount expended during the fiscal year ending June 30, 1871

Amount available July 1, 1871....

(See Appendix D 5.)

$12, 551 52

3,156 76

9,394 76

6. Vermillion Harbor, Ohio.-No funds have been available for any improvement here during the year. The piers are in fair condition, and there is ample water in the channel to meet all requirements of the commerce of the harbor.

No appropriation for the next fiscal year is required.
Probable annual cost of keeping the piers in repair, $1,000.

(See Appendix D 6.)

7. Black River Harbor, Ohio.-Nothing of consequence has been done during the year. The piers are in good repair, and there is a good channel with 12 feet of water to the harbor.

No appropriation for the next fiscal year is required. Probable yearly amount required to keep the piers in good condition, $1,000.

Amount on hand July 1, 1870..........

Amount expended during fiscal year ending June 30, 1871.

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Amount available July 1, 1871..

(See Appendix D 7.)

7,914 05

8. Cleveland Harbor, Ohio.-During the year the pier-head of the east

pier has been repaired, and 9,500 cubic yards of sand removed from the channel between the piers.

No further appropriation is required for the improvement of this harbor upon the plan adopted, but the commerce of Cleveland is increasing so rapidly that additional harbor facilities will be needed at no distant day.

Annual expenditure of $1,000 will probably keep the piers in repair. Amount on hand July 1, 1870 ...

$2,420 00

Amount appropriated by act of July 11, 1870
Amount expended during the fiscal year ending June 30, 1871
Amount available July 1, 1871.......

20,000 00

2,628 45 19,791 55

(See Appendix D 8.)

9. Grand River Harbor, Ohio.-No work has been done year. There is now a good channel with 12 feet of water. priation for the next fiscal year is required. Amount available July 1, 1871..............

(See Appendix D 9.)

during the No appro

$53,664 59

10. Ashtabula Harbor, Ohio.-Under the appropriation of $15,000 of March 3, 1871, a contract has been entered into to remove about 7,000 cubic yards of shale-rock by blasting and dredging, so as to give a depth of 12 feet at low water. This work is now in progress, and the 60-foot channel, blasted in 1869-'70, will be widened to the full distance between the piers. This will make as good a harbor as is possible to make of it.

No appropriation for the next fiscal year is required. amount annually required to keep the piers in repair, $800. Amount on hand, July 1, 1870..

Amount appropriated by act of March 3, 1871
Amount expended during the fiscal year ending June 30,
1871 .............

Amount available July 1, 1871..

Probable

$150 22

15,000 00

5.00

15, 145 22

(See Appendix D 10.)

11. Conneaut Harbor, Ohio.-The pier-head of the east pier has been repaired. Under the appropriation of $6,000 of July 11, 1870, a contract has been made for the extension of the east pier 90 feet. This work is now in progress.

No appropriation for the next fiscal year is required. be kept in repair at an annual cost of $500.

Amount on hand July 1, 1870....

Amount appropriated by act of July 11, 1870..

The piers can

Amount expended during fiscal year ending June 30, 1871..
Amount available July 1, 1871...

(See Appendix D 11.)

$2,864 15 6,000 00 1, 542 33 7,321 82

12. Erie Harbor, Pennslyvania.-During the fiscal year 9,851 cubic yards of sand were removed from the inner bar, and 15,466 cubic yards from the outer bar of this harbor, under the contract of March 29, 1867. The repairs to the breakwater connecting the south pier with the south shore have been completed. The appropriation of July 11, 1870, has been used in part in these repairs.

An additional appropriation of $29,000 was made on March 3, 1871.

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