364 
BATHYMETRICAL SURVEY OF 
deep water is all towards the upper end, the lower half of the loch 
being very shallow. The area enclosed by the 50-feet contour is about 
half the total length of the loch, and in this part the sections are 
somewhat U-shaped. A slight shoaling is observable opposite the 
entrance of the stream near the middle of the eastern shore, where, 
in the centre, the deepest sounding was 52 feet, with depths of 60 feet 
and over both to the north-east and south-west. 
T em'perature Observations . — Serial temperatures in the deepest part 
indicated practically the same range (5°) as in the west loch, and the 
distribution of temperature was exactly similar, but all parts of the 
loch were about 1° higher : — 
Surface ... ... ... ... ... ... ... 51°’0 Fahr. 
10 feet 47°-5 ,, 
20 „ 46°-2 „ 
50 „ 46°-0 „ 
Loch Laggan (see Plate LXXXV.). — Loch Laggan is situated in the 
southern portion of Inverness-shire, between the Highland and West 
Highland railways, being about equally distant from the nearest points 
of each. Dalwhinnie, on the Highland railway, is about miles from 
the upper end of the loch; Tulloch, on the West Highland railway, is 
about 6 miles from the lower end. The coach road from Kingussie to 
Tulloch passes along the northern shore. The loch runs nearly north- 
east and south-west, and occupies a valley lying between the very high 
mountains of Badenoch on the south-east and an equally high and more 
extensive mountain mass of the district of Lochaber on the west. The 
loch is of the usual elongate narrow form of Scottish lochs, narrowest 
in the central parts, and somewhat expanded towards each end, where 
deeper water occurs. The outline is very irregular, and the bottom, as 
shown by the contours, correspondingly irregular. A number of larger 
and smaller islands are found in the narrower parts of the loch. The 
length is a little over 7 miles, the greatest breadth two-thirds of a mile, 
the mean breadth nearly half a mile, the superficial area about 1900 
acres, or nearly 3 square miles. The maximum depth is 174 feet, the 
mean depth 68 feet, and the volume of water about 5600 millions of 
cubic feet. The loch was surveyed on June 2 and 3, 1902, when the 
elevation of the lake-surface above the sea was found, by levelling from 
bench-marks to be 818-6 feet ; the officers of the Ordnance Survey found 
the elevation to be 818-9 feet above sea-level on October 19, 1867. The 
shores are wooded nearly throughout, and the scenery wild and pic- 
turesque (see Fig. 54), the mountains rising abruptly on the north side 
into a series of peaks, culminating in Creag Meaghaidh, 3700 feet 
high. On the south-east the high mountains are more distant, Beinn 
a’ Chlachair, over 3500 feet, being 4 miles from the lower end of the 
loch. Close to the loch on this side, two hills, rather more than 2000 
