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APPENDIX. 363 WATER TABLE. Showing the mean level of Lake Michigan and Lake Huron during the months of May, June, July, August, September,|Octobor, and Novem- ber, for sixteen years, from 1876 to 1891. Date. May. June. July. | Oct. Nov. b> x 2 HM WOOMNROP RONDO 20 FOUN MFRWDOUOONA PO peak & oo e BO BO b+ DO F+ OO WO CO Cy OO B WE QO at oo C9 BO DO bt 4+ ed bt DO WO BW CO TO VW SOUS B® G9 FD BH 71 WO GH * C9 C0 DD HH Rt et et BD. BD 2.29 CD DDE 09 C9 C9 © DO ht ht Rt et BO BO BD C0 00 BD ht bab bd ihm BD OT OT CO CA DD CD OD > C9 29 69 CS OD ED BD ht RA RD H+ RO D9 BD O9 BD LO et AAS AODDDOH AIM IINH I <3 29 P= Fd C9 C9 C9 CD BD 9 VO B9 BO BO 9 9 BOW PH DODMDNWHOHRORAWDOERAMD m= © © BR OH 21 WR CD CD ED DD Pt Rt BDV BW 69 CD BD WD et ted oD oS & e @ C8 CO 0 CD =236> eS So Oo 29 pd @8 co t es = oo 69 60 pd ot ie ie i: an S og CD @ Nors.--The above figures, from official records indicate the number of feet and tenths, that the level of the lake was below the plane of reference, which corresponds with the High: Water of.1838. The high- est water of which we have any authentic record was in the year 1838, and the lowest water occurred in 1819; the difference between the extreme fluctuations was 54 feet. A hew plane of reference has been adopted. It is the mean level of the sea, observed in New York Bay. In January, 1891, the mean level of Lake Michigan and Lake Huron was 580.02 feet, and Lake Superior 600.66 feet above this plane of reference. _ . The height of Lake Superior, as observed above the lock in the Sault River, is 20.64 feet above Lake Huron. 'The level below the lock is 3.07 feet above Lake Huron. REGULATIONS FOR ISSUING CHARTS OF THE LAKE | SURVEY. © J, Charts are no longer issued free of charge to vessels. 2. Charts can be purchased by any one, at the U. S. Engineer's office, 34 West Congress St., Detroit, for 20 cents per sheet. The general chart of Lake Superior is in three sheets, and that of Lake Michigan in two sheets and Lakes Huron, Erie and Ontario in one sheet. AREA OF THE LAKES,,AND THEIR HEIGHT ABOVE THE 7 SEA. Lake SurErior contains 31,200 square miles, and its mean level for nineteen years is 601.55 feet above the mean level of the sea. Laxe Micaican contains 22,450 square miles, and its mean level for 19 years, is 581.56 feet above the mean level of the sea. Laxr Huron contains 23,800 square miles, and its mean level for 19 years is 581.56 feet above the mean level of the sea. Laxe Erte contains 9,960 square miles, and its mean level is 573 feet above the mean level of the sea. & a. Laxe ONTARIO contains 7,240 square miles, and its mean level is 246.65 feet above the mean level of the sea.