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it was proposed to take soundings, and some could not be reached on account of the great number of vessels lying about the wharves; but it is confidently believed that a sufficient number have been taken to clearly and unmistakably indicate the depths of water and mud and the character of the bottom.

As will be seen by reference to the profiles, rock presents itself under the mud near the southern termination of the survey at Harrison street, and also at the northern termination near Chestnut street. The intermediate distance presents clay and sand ; in some cases, the former, pure blue, and in others, a mixture of both; in either case of so tough a character as to demonstrate very conclusively its entire adaptation for a permanent foundation. The sounding rod was driven in every case to such a depth as to sustain a steady weight of nearly thirty-four tons.

A map of cross sections is also submitted, which indicates the soundings transversely with the water front. The depths of water on the four different lines, bave reference to “mean low tide,” as established by the United States Government Engineers, at the dock at Fort Point. To facilitate this work, and as useful in indicating the condition of the tides in the bay, I established a similar lide guage to that of the Government, at the foot of the boat stairs at the intersection of the water front line and the south line of the Jackson street wharf.

The accompanying table exhibits the stations, depth of water, depth of mud, (in feet,) and the character of the bottom along the four lines of soundings.

I have not considered myself called upon at this time to discuss the character of the sea wall or water front improvement, but deem it not out of place to again express the clear conviction in my own mind, of the perfect adaptation of the bottom of the bay, where soundings have been taken, for a permanent foundation for the proposed protection of the water front.

Very respectfully,

W

Your obedient servant,

THADDEUS R. BROOKS.

Civil Engineer.

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CENTRE LINE.

LOCATION.

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...

1 1 1 2 2 1 2 1 2 1

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Harrison street.... 125 feet north ........ 250 feet north ............ 375 feet north..... Centre of Folsom street. 110 feet east.... Centre of East street McPherson's Wharf... 160 feet north.... North line Howard st ... 100 feet north... 227 feet north ............... 300 feet north..... South line Mission street North line Mission street 150 feet north.. 275 feet north. 450 feet north. South line Market street North line Market street Coinmercial Wharf. Clay Street Wharf ........ 150 feet north Washington St. Wharf... 100 feet north.... 225 feet north 350 feet north Jackson street. 213 feet north Centre of Pacific street .. 75 feet west......... West line Drumm street. 100 feet west... Centre Davis street. 75 feet north 194 feet north ............... North line Broadway.... South line Vallejo street Centre Vallejo street..... 134 feet west........ East line Front street.... Centre Front street...... North line Vallejo street 131 feet north....... North line Green street.. 171 feet north. North line Union street.. 171 feet north ....... North line Filbert street.. 175 feet north ....... Centre Greenwich street,

23 Clay. 19 Rock. 39 Rock. 42 Rock, 60 Sand. 73 Clay. 68 Sand. 68 Clay. 71 Clay. 60 Clay. 66 Clay. 69 Clay. 68 Clay. 70 Clay. 71 Clay. 69 Clay. 71 Clay. 72 Clay. 61 Clay. 74 Clay. 56 Clay. 66 Clay. 50 Clay. 49 Sand. 51 Sand. 51 Sand. 69 Sand. 70 Sand. 63 Clay. 53 59 Clay, 17 Sand. 55 Clay. 66 Sand. 64 Sand. 59 Clay. 20 Sand. 21 Sand. 21 Sand. 39 Clay. 22 10 11 Rock. 18 Rock. 17 Rock. 34 Sand. 43 Sand. 35 Clay. 28 Sand. 18 Sand. 11 Sand.

INSIDE LINE.

LOCATION.

in feet ......... Depth of Water,

in feet ......... Depth of Mud,

Bottom .......

Character of the

in feet......... Depth of Water,

11
1
3

ميري

18
13
3
1
3
6
2

1 D
1
1

Harrison street
375 feet north
Folsom street. ................
Centre L Steuart street ...
East street........
McPherson's Wharf........
Howard street....
225 feet north
Mission street
Market street...........
Clay street.....
Merchant street......
Washington street .........
Jackson street................
180 feet north .............
Pacifie street..........
West line Drumm street..
Davis street.......
Broadway street
Vallejo street.........
145 feet west ....
Graded to 140 feet north

of Green street....
Union street............
Filbert street........
Greenwich street....
Battery street.......
North line Greenwich st..
Lombard street....
104 feet north........
Graded to Chestnut street.

11 Rock.
32 Rock.
60 Sand.
60
71 Sand.
69 Sand.
65 Sand.
66 Clay.
70 Clay.
74 Clay.
69 Clay.
64 Sand.
50 Sand.
48 Clay.
62 Clay.
60
49 Sand.
61 Clay.
60 Clay.
25 Sand.
39 Sand.

1
1
1
1
1
1
2
3
1
2
1
4
1

2
3
20
4
8
12
3

36 Sand.
34 Sand.
19 Sand.
31 Sand.
27 Sand.
20 Clay.
32 Sand.

2
1
1
2

2 3 6 4 4 1

2 3 2 3

5 11 21 28

TABLE OF SOUNDINGS—Continued.

CENTRE LINE.

in feet......... Depth of Water,

in feet......... Depth of Mud,

Bottom ........ Character of the

18

8 11 34

20 Sand. 27 Sand. 26 Clay.

4 Sand. 32 Sand. 31 Sand.

9 Rock. 12 Rock.

21

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Harrison street...... 125 feet north 250 feet north 375 feet north.. South line Folsom street.. 110 feet east... East line East street....... North line Folsom street.. 125 feet north.. 250 feet north 344 feet north 500 feet north... North line Howard street. 100 feet north.. 230 feet north... 350 feet north 450 feet north Mission street. North line Mission street. 100 feet north 200 feet north.. 300 feet north.. 450 feet north South line Market street.. North line Market street.. Commercial Wharf... Clay Street Wharf 150 feet north .... Washington Street Wharf 150 feet north Jackson Street Wharf .....

24 Clay.
38 Rock.
42 Sand.
45 Clay.
57 Clay.
70 Clay.
48 Sand.
64 Sand.
66 Sand.
65 Clay.
67 Clay.
76 Sand.
62 Clay.
61 Clay.
75 Clay.
60 Clay.
70 Sand.
60 Clay.
71 Sand.
66 Clay.
69
75 Sand.
61 Clay.
46 Sand.
64 Clay.
60 Clay.
70 Clay.
56 Clay.
49 Clay.
49 Sand.
49 Sand.

25 Clay. 37 Sand. 58 Clay. 63 Sand. 39 Clay. 57 Sand. 53 Clay. 56 Sand. 69 Sand. 66 Clay, 66 Clay. 62 Clay. 57 Clay. 63 Clay. 61 Clay. 72 Sand. 68 Clay. 58 Clay. 71 Clay. 61 Clay. 58 Clay. 55 Clay. 51 Sand. 52 Sand. 49 Sand. 49 Sand. 45 Clay. 49 Clay. 48 Clay. 48 Sand. 59 Clay.

LOCATION.

171 feet north
Centre Battery street.....
171 feet north....
Centre Lombard street...
171 feet west ...........
Centre Sansome street...
134 feet north
S. line Chestnut street...

SLOPE LINE.

LOCATION.

in feet......... Depth of Mud,

33
19
5

2.
31
13
15
14
4
4
2
3
3

...

Harrison street ....
125 feet north
250 feet north
Folsom street..
East street...
150 feet north
284 feet north
418 feet north.....
McPherson's Wharf......
156 feet north
North line Howard street
103 feet north
230 feet north
350 feet north
South line Mission street
North line Mission street
150 feet north
275 feet north .........
380 feet north
South line Market street
North line Market street
Commercial Wharf.........
Clay Street Wharf.
150 feet north..
300 feet north
Jackson Street Wharf...
176 feet N. Jackson street
Centre Pacific street......
135 feet north.........
West line East street.....
West line Drumm street.

2
2
3
2
1
1
2
4
3

2 3 3 6 7 5 2

2 3 3

TABLE OF SOUNDINGS-Continued.

FRONT LINE.

SLOPE LINE.

LOCATION.

in feet......... Depth of Water,

in feet .......... Depth of Mud,

Bottom ........

Character of the

in feet......... Depth of Water,

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2
3

3

3 2 3

6 5 5 5 3 2 4 5 8 4

5

134 feet north...... 266 feet north Centre Pacific street.... North line Pacific street.. West line East street...... West line Drumm street.. 100 feet west East line Davis street ..... 119 feet north North line Broadway. 137.50 feet north. South line Vallejo street.. 150 feet north.. West line Davis street..... East line Front street...... 131 feet north North line Green street... 171 feet north ..... North line Union street... 171 feet north North line Filbert street.. 137.50 feet north....... South line Greenwich st.. North line Greenwich st.. West line Front street..... East line Battery street... South line Lombard street North line Lombard street West line Battery street... East line Sansome street.. South line Chestnut street

58 Sand.
48 Clay.
48 Clay.
47
47 Clay.
58 Clay.
18 Sand.
59 Sand.
57
24 Sand.
23 Sand.
22 Sand.
42 Sand.
25 Sand.
32 Sand.
34 Clay.
37 Sand.
42 Sand.
41 Sand.
36 Sand.
25 Sand.
14 Sand.
12 Sand.

45 Sand. 55 Sand. 53 Clay. 51 Clay. 47 Clay. 43 Sand. 38 Clay. 38 Sand. 45 Sand. 43 Sand. 38 Sand. 32 Sand. 17 Sand. 10 Sand. 6 Sand. 8 Sand. 10 Sand. 9 Sand. 8 Sand. 6 Sand. 1 Sand. 22 Sand, 4 Sand.

LOCATION.

8 Sand. 11 Sand. 24 Sand. 8 Sand.

Sand.
4 Sand.
33 Sand.
9 Sand.

134 feet west
59 feet north .........
North line Broadway..
137.50 feet north..
South line Vallejo street.
210 feet north
West line Davis street...
134 feet west
North line Green street..
171 feet north.........
North line Union street.
171 feet north............
North line Filbert street.
137.50 feet north..........
S. line Greenwich street.
210 feet north
West line Front street...
133.75 feet north.....
S. line Lombard street....
210 feet north
West line Battery street.
133.75 feet north .....
S. line Chestnut street...

2 3 4 5

23 29 30 32 30 30 32 37 37 13 33

5 15 25 27 31 28 15 32 33 35

2 28

Coco

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