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SAN FRANCISCO, March 8th, 1866.

TO THE HON. BOARD OF STATE HARBOR COMMISSIONERS:

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GENTLEMEN :- I had the honor of receiving at your hands the appointment as Engineer for making a survey of the water front of this city, extending from the north line of Harrison street to the south line of Chestnut street, indicating the depths (in feet) of water and mud. The surveys, maps, and profiles baving been completed, I beg respectfully to make the following report :

The time designated in the contract for the commencement of this work was the fifteenth day of November last; and on that day I commenced with some experiments to determine the most effectual method of making the soundings. In the surveys of this character which I bad previously made, I used a sounding rod of gas pipe, three quarters of an inch in diameter; but the great depth of mud along the water front rendered this apparatus entirely inadequate for the purpose. I then decided upon using pipe of one and a half inches in diameter, with a pair of scows and a pile driver, with leaders thirty-five feet long, and a hammer weighing fifteen hundred pounds. An experiment tried with

apparatus before finally commencing work, proved entirely satisfactory; and on the twenty-seventh day of November last, the survey was commenced and steadily prosecuted to its completion A great deal of delay was necessarily met with, as in even ordinary rough weather no soundings could be taken. The scows were obliged to be firmly anchored or secured to the wharves, before it was safe to commence work. It was tedious and vexatious in very many cases; and to facilitate the work, I employed Mr. Thomas D. Parkinson, a Civil Engineer, as my assistant, whose skill, perseverance, and good judgment, were at all times manifested.

The soundings of the depth of water and mud are taken upon the inner, centre, and outer lines of the water front, each seventy-five feet apart, and also on a line distant about sixty feet from the outer line of the front, which is denominated the “slope line.”. Specimens of the bottom are also submitted for your examination, each one being lettered, and the point where it was obtained indicated on the profiles. A great deal of difficulty was experienced in getting to some of the points where

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, have 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 Gov. ernment, 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 exbibits 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,

Your obedient servant,
THADDEUS R. BROOKS.

Civil Engineer

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INSIDE LIXE.

LOCATION,

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

Bottom ....... Character of the

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

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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.

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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,

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

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1 2 3 6 4 4 1

2

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CENTRE LINE.

LOCATION.

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

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

Bottom ........
Condition of the

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

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

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3
20
4
8
12

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.

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11 21 28 LOCATION.

TABLE OF SOUNDINGS-Continued.

CENTRE LIXE.

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FRONT LINE.

SLOPE LINE.

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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 Wbarf... 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.

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...

LOCATION.

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.

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 Saud. 68 Clay. 58 Clay. 71 Clay. 61 Clas. 58 Clay. 55 Clay. 51 Sand. 52 Sand. 49 Sand. 49 Sand. 45 Clay, 49 Clay, 48 Clay. 48 Sand. 59 Clay.

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TABLE OF SOUNDINGS—Continued.

FROXT 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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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 foet 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.

4 5 8 4 4 2 3

8 Sand.
11 Sand.
24 Sand.
8 Sand.
7 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...

23 29 30 32 30 30 32 37 37 13 33

5 4 5 15 25 27 31 28 15 32 33 35

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