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APPENDIX B B B.

BBB 1.

ANNUAL WATER-LEVELS OF THE NORTHERN AND NORTHWESTERN LAKES.

Tri-daily observations of water-gauges were made at the following places from July 1, 1887, to June 30, 1888: Charlotte, N. Y., on Lake Ontario; at Cleveland, Ohio, and Erie, Pa., on Lake Erie; and at Milwaukee, Wis., and Escanaba, Mich., on Lake Michigan. By reason of ice and snow no observations were made at Escanaba during the months of January, February, March, and April of 1888. Observations were also made at Sand Beach, Mich., on Lake Huron, and at Marquette and Sault Ste. Marie, Mich., on Lake Superior. At the last named place the observations are from June 1, 1887, to May 31, 1888.

Monthly mean of water-levels for the several stations (in feet) below the planes of reference adopted in 1876.

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The practice has obtained of publishing diagrams showing the monthly means of water-levels at the end of each period of five years. Such a diagram was published in the Annual Report for last year. With the Report for this year are presented consolidated tabulated records of mean monthly water-levels for the different lakes for each year for which such records are complete, so far as the files of this department furnish the information. These tabulations show also the yearly mean water-levels for each year therein and the mean levels for the entire periods included in the tabulations.

A sheet of diagrams to illustrate the mean yearly oscillations of the dif ferent lakes accompanies these tabulations.

May.

June.

Mean monthly water-level below plane of reference for Lake Superior.
[Place of observation: Superior.]

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Mean monthly water-level below plane of reference for Lakes Michigan and Huron. [Place of observation: Point Aux Barques.]

Year. Jan. Feb. Mar.

Apr. May. June. July. Aug. Sept. Oct. Νον. Dec.

Yearly

mean.

Feet. Feet. Feet. 1860.. 2.02 2.07 1.93

1862.. 2.41

2.42

1863.. 2.49

2. 64

2.51
2.69

2.30 1.93

2.62 2.30

Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. 1.96 1.91 1.67 1.58 1.66 1.85 1861.. 2.86 2.82 2.68 2.48 1.86 1.52 1.40 1.29 1.37 1.81 1.76 1.78 2.00 2. 17 2.26 2.25 2.39

2.23 2.35 2.65
1.59 1.90 2.03
1.72 2.04 2.33
2.65 2.69 2.92

1.99

1.98

2.08

2.51

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3. 71

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3.52
2.72

2.47

2.39

2.79 2.86

3. 29

3. 27

3. 17 2.86 2.67 2.70 2.66 2.85 2.96 3.23
2. 12 1.63 1.19 1.25 1.36 1.76 1.91 2.10
2.22 2.26 2.08 2.18 2.45 2.59 2.64 2.69
246 2.29 2.25 2.35
3.02
3.60 3.57 3.44 3.30 3.26
3.87 3.86 3.46 2.97 2.66
2.95 2.78 2.63

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Mean monthly water-level below plane of reference for Lakes Michigan and Huron. [Place of observation: Milwaukee.]

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Excluding observations from 1864-72, inclusive to compare with table for Lake Huron. NOTE.-Omitting from the Milwaukee record those years not appearing in the record for Lake Huron the following results: At Milwaukee (Lake Michigan), sum of monthly totals, 580.813; mean water-level below plane of reference, 2.5474+. Lake Huron, sum of monthly totals, 579.65; mean water-level below plane of reference, 2.5423 +.

Mean monthly water-level below plane of reference for Lake Erie.
[Place of observation: Cleveland.]

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1865.. 3.10 3. 68

3.36

2. 64

1866.. 3.33

3.49

3.10

2.52

1867..

2.77

3. 09

2.69

1868.. 3.69

4.07 3.48

1869..

3.46

3.53

1870..

2. 22

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2.06 2.30 2.04 1.93 2.18 2.24 2.25 2.37 1.85 1.54 1.73 2.04 2.43 2.77 2.65 2.20 1.81 1.84 2.36 2.63 3.08 3.05 2.75 2.20 1.81 1.53 1.99 2.22 1.57 1.36 1.39 1.33 2.99 2.54 2.06 1.79 1.76 1.78 1.99 1872.. 3.53 3.77 3.86 3.66 3.22 2.85 2.66 2.89 1873.. 3.95 3.94 3.87 2.59 1874.. 2.06 2.01 1.98 1.81 1875.. 3.51 3.71 3.57 3.17 1876.. 2.75 2.19 1.54 1.02 1878.. 2.29 2. 15 2.02 1.60 1.34 1879 2.60 2.74 2.71 2.35 2.20 1852.. 2.00 2.00 1.55 1.33 1883.. 2.83 2.62 1881.. 2.32 2.06

1.85 2.29 2.70
1.51 1.77 2.04
2.26 2.57 2.74
2.08 2.12 2.20 2.24 2.54 2.92 3.06
2.49 2.48
3.27 3.49
3.24

2.73

1.71

2.67

2.31

2.67

2. 53

2.50

3.45

2.88

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Mean monthly water-level below plane of reference for Lake Ontario.

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4.30 3.52

3.17

3.12

2.97 3.15

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2.98 2.75

2.54

1881

4.23 4.14

3.57

3.20

2.90

2.70

1882

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1883

3.59 3.52 3.30

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1884

2.70 2.28 2.19

1885

1886

1887

3.067 3.36 3.58 1.94 1.94 1.94 2.98 2.30 1.86 Total. 85. 427 85.08 78.67 Mean 3.051 3.04 2.81

1.11 0.97
2.851 2.06
0.97 0.81
1.58 1.05

3.38 3.63 2.28 1.36 0.68 0.56 0.54 0.96 1.62 1.96 3.07 2.46 2.31 2.49 2.46 2.72 3.13 3.52 3.66 2.61 2.21 1.88 1.88 1.92 2.02 2.17 2.60 2.63 1.95 2.36 2.50 2.24 2.08 2.05 2.24 2.61 3.01 3.45 3.84 3.82 2.71 2.40 2.47 2.84 3.15 3.63 3.73 3.93 3.11 2.65 2.98 3.42 3.74 3.74 1.35 1.72 2.10 2.57 3.05 1.28 1.436 1.075 1.219 1.479 1.976 2.38 2.98 1.723 1.58 1.77 1.96 2.87 2.84 0.88 1.21 1.63 2.05 2.41 2.70 1.06 1.34 1.83 2.43 2.91 3.40

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61.931 49. 19
2.212 1.76

45.388 47.369 55,095 65.903 76.93 84.67
1.621 1. 692 1.968 2.354 2.75 3.024

85,464 821.117 3.052 2.444

BBB 2.

ISSUE OF PUBLISHED CHARTS OF THE NORTHERN AND NORTHWESTERN LAKES.

ANNUAL REPORT OF LIEUTENANT-COLONEL O. M. POE, CORPS OF EN-
GINEERS, BVT. BRIG. GEN., U. S. A., FOR THE FISCAL YEAR ENDING
JUNE 30, 1888.

UNITED STATES ENGINEER OFFICE,
Detroit, Mich., July 3, 1888.

SIR: I have the honor to transmit herewith, in duplicate, my annual report on the "issue of the published charts of the northern and northwestern lakes" for the fiscal year ending June 30, 1888.

Very respectfully, your obedient servant,

The CHIEF OF ENGINEERS, U. S. A.

O. M. POE,
Lieut. Col. of Engineers,
But. Brig. Gen., U. S. A.

ISSUE OF THE PUBLISHED CHARTS OF THE NORTHERN AND NORTHWESTERN LAKES.

The issue of the charts to registered vessels has continued during the year in accordance with regulations; also their sale at a fixed price (to cover cost of paper and printing) to all who desired to purchase.

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