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

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

2.947

3.064

77.237 70.847 68. 114
2.97 2.721 2.620

Year. Jan. Feb.

Mar.

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

Tea

Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Feet. Fe 1860.. 2.02 2.07 1.93 1.96 1.91 1.67 1.58 1.66 1.85 2.23 2.35 2.65 1861.. 2.86 2.82 2.68 2.48 1.86 1.52 1.40 1.29 1.37 1.59 1.90 2.03 1 1862.. 2.41 2.42 2.51 2.30 1.93 1.81 1.76 1.78 2.00 1.72 2.04 2.33 1863.. 2.49 2.64 2.69 2.62 2.30 2.17 2.26 2.25 2.39 2.65 2.69 2.93

[Place of observation: Port Austin.]

1873.. 4.25 4.28 4.21 3.80 3.30 2.90 2.70 2.69 2.86 2.89 2.99 3.15 1874.. 3.13 2.99 2.85 3.00 2.95 2.61 2.45 2.56 2.72 2.96

3.23 3.48

[Place of observation: Sand Beach.]

1875.. 3.69

3.75

1882.. 2.90

3.13

2.99

2.77 2.60

1883.. 3.12

3. 17

3. 13

3.12

3.71 3.52 3.17 2.86 2.67 2.70 2.66 2.85 1876.. 3.11 3. 13 3.00 2.72 2.12 1.63 1.19 1877.. 2.39 2.40 2.47 2.39 2.22 2.26 2.08 2. 18 1878.. 2.79 2.96 2.79 2.86 2.46 2.29 2.25 2.35 2.64 2.63 1879.. 3.32 3.56 3.60 3.57 3.44 3.30 3.26 3.39 3.47 3.71 1880.. 3.80 3.86 3.87 3.86 3.46 2.97 2.66 2.77 2.88 3.24 1881.. 3.69 3.30 3.29 3.27 2.95 2.63 2.80 2.96 2.71 2,58 2.75 2. 17 2.29 2.52 2.77 2.92 1.77 2.10 1.99 2.10

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

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.]

1864.. 3.02 2.87

2.66

2.16

1865.. 3.10 3.68

3.36

1866.. 3.33

3.49

3. 10

1867.. 2.77 3. 09

2.69

1.98

1.81

1875.. 3.51 3.71

3.57

2.27 2.14 0.59 1.34 1.34 2.20 2.11 1882.. 2.00 2.00 1.55 1.33 1.13 0.98 1883.. 2.83 2.62 2.43 2.31 1.85 1.15 1881.. 2.32 2.06 1.87 1.32 1.05 0.97 1885.. 2.84 3.05 3.19 2.37 1.64 1.13 18-6.. 1.56 2.29 2.48 1.60 1.30 1. 20 1887.. 2.50 2.07 1.29 1.24 1.06 1. 04

3. 17

1.46 1.51 1.77 2.64 2.06 2.08 2.12 2.52 2.30 2.04 1.93 2.18 2.24 2.37 1.85 1.54 1.73 2.04 2.43 1868.. 3.69 4.07 3.48 2.65 2.20 1.81 1.84 2.36 1869.. 3.46 3.53 3.05 2.75 2.20 1.81 1.53 1.63 1.90 2.35 1870.. 2.22 1.99 2.22 1.57 1.36 1.39 1.33 1871.. 2.66 2.99 2.54 2.06 1.79 1.76 1.78 1872.. 3.53 3.77 3.86 3.66 3.22 2.85 2.86 1873.. 3.95 3.94 3.87 2.59 1.92 1.84 1.86 1.92 1874.. 2.06 2.01 1.72 1.65 1.62 1.78 2.70 2.15

2.04 2.26

1.02

0.70

0.70 1.00

1. 60

1.34 1.58

2.35

2.08

1.05 1.19

0.95 1.01

1. 19

Mean monthly water-level below plane of reference for Lake Ontar VE

ISSUE OF PUBLISHED CHARTS OF THE NORTHERN AND NORTE
ERN LAKES.

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

UNITED STATES ENGINEER Office,
Detroit, Mich., July 3,

SIR: I have the honor to transmit herewith, in duplicate, my report on the "issue of the published charts of the northern and western 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, Bot. Brig. Gen., US

ISSUE OF THE PUBLISHED CHARTS OF THE NORTHERN AND NOI WESTERN LAKES.

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