186 ROYAL SOCIETY OF CANADA 
The following levels are based on a list published in 1860 by Thos. 
C. Clarke, C.E,, in a Report on the Surveys of the Ottawa Ship Canal, 
addressed to the Hon. Commissioner of Public Works. His starting 
point, Lake St. Louis, is assumed as 57 feet above the sea, whereas the latest 
levelling of the Public Works Department gives it as 72:47 feet, that is, 
15°47 feet higher. This correction, after deducting 1:10 feet from 
Clarke’s estimate of the rise between Ottawa and Grenville, would give an 
elevation of 588°37 feet for Lake Huron, as compared with 581-28 feet, the 
latest determination of the U.S. Coast Survey, or 7:09 feet too high. This 
difference has been spread proportionately over the total rise and fall 
between Ste. Anne's and the mouth of the French River. As a proof of 
the general accuracy of the levels thus deduced, it may be mentioned 
that the elevation given herein for Lake Nipissing is the same as that 
given by the corrected levels of the Northern Pacific Junction Railway 
(now part of the Grand Trunk Railway), and the elevation of the mouth 
of the Mattawa River also agrees with that deduced from the profiles 
of the Canadian Pacific Railway. 










J. WHITE. 
D On. COLE < 
É RE Fe - 
= | asf © À .° d,Q mm = © 
ae = ENS 532 LH 
pe | _, | 223 | 68 | 2e 
= | MONTREAL TO MATTAWA. 8 5 SE ge” 38 : 
Z TS | S38 | $3 | ome 
2 on | ES | fam | SRE 
.— .— oO 2. .— 
À ee 5 a A 
| Montreal Harbour—opposite Longueuil!........ 25°45 40°62 | 15°17 
| oh MS “Round Island| spec. oe 25°45 41°20 | 15°75 
| 
EP es at Victoria Bridge| 8°55 34°00 42°00 8°00 
PHARES EMLOUIS ENTIER ee 38°47 72°47 80°36 | 7:90 
MO ower Ste ANNE... LR TER PO QUI PEN 72°47 79°0 6°50 
22-10 | ÜppenSte Anne". 1-0 CU SREPRERET 1°00 73°5 82°5 9°00 
17710 Canillon Rapids 122... euUNRE 1:00 745 86°5 12:00 
49-00 | Above Carillon Rapids..... ........... 8°65 83°15 93°1 10°00 
53.00 | Chute à Blondeau Rapids.............. “05 83°2 95°2 12°00 
53°10 | Above Chute à Blondeau Rapids....... 3°95 87°15 102°35 | 15°20 
54°50 | Foot of Long Sault Rapids......... aie ‘10 87:25 103°65 | 16°40 
60 43 Grenviller. cy PMP RARE RER EE ER 45°30 132°55 147:35 | 14°80 
116-50 | Ottawa Harbour {Rise estimated) | 1-20 | 133-75| 158-75 | 20-00 
Above Chaudière Falls................. 41°85 175°6 1836 | 8:00 
CO 
© 
© 
ni 
a 
JV 
© 
190°6 7:00 

118°50 | Above Little Chaudière Falls....: Var 
