302 
BATHYMETRICAL SURVEY OF 
Loch Craggie (see Plate LXIX.). — Loch Craggie is a small but rather 
deep loch, less than 3 miles to the south of Loch Ailsh, the road from 
Oykell Bridge to Lochinver running along the northern shore. It 
trends in a north-west and south-east direction, is nearly two-thirds of 
a mile in length, and covers an area of about 45 acres. The maximum 
depth of 40 feet was observed approximately in the centre of the loch. 
The volume of water is estimated at 30 million cubic feet, and the 
mean depth at 15J feet. It was surveyed on September 23, 1902, when 
the elevation of the lake-surface was found to be 505-95 feet above the 
sea; when visited by the Ordnance Survey officers on August 26, 1871, 
the elevation was 506-5 feet above sea-level. 
Loch Craggie is quite simple in conformation. The water is deep 
close to the shore all round, except towards the outflow at the south-east 
end, the area of the lake-floor covered by less than 10 feet of water 
being only about 15 acres, or 34 per cent, of the entire area; more than 
half of the bottom is covered by water between 10 and 25 feet in 
depth, while about 6 acres, or 13 per cent., are covered by more than 
25 feet of water. Temperature observations taken at 3.30 p.m. on the 
date of the survey showed that the water was practically uniform in 
temperature from surface to bottom, the reading at the surface being 
52°-8 Fahr., and at the depths of 15 and 30 feet, 52°-5. 
Loch an Daimh (see Plate LXIX.). — Loch an Daimh (or Damph) is 
situated about 7 miles to the south-west of Oykell Bridge, and about 
8 miles to the east of Ullapool on Loch Broom. Though at present in 
the eastern watershed, the day may not be far distant when it will be 
diverted to the west, for the small stream flowing into the Rhidorroch 
river is cutting back rapidly, is much lower than the loch, and will 
probably tap the loch at its south-west end. The shores rise well above 
the loch, and the south-eastern shore is wooded ; it is a good trout loch, 
but the fishing is preserved. Loch an Daimh is a narrow loch trending 
south-west and north-east, nearly 1| miles in length, with a maximum 
breadth of only one-fifth of a mile. Its waters cover an area of about 
173 acres, or a quarter of a square mile, and it drains an area of about 
2J square miles. The maximum depth of 52 feet was observed approxi- 
mately near the centre of the loch, but towards the south-west end. 
The volume of water is estimated at 205 million cubic feet, and the 
mean depth at over 27 feet. The loch was surveyed on August 23 and 
25, 1902, when the elevation of the lake-surface was found to be 
671-5 feet above the sea — identical with the elevation observed by the 
Ordnance Survey officers on August 1, 1870; during the winter of 
1901-2 the water rose 2 to 3 feet. 
Loch an Daimh is extremely simple in conformation, with no pro- 
nounced irregularities of the lake-floor. The 10-feet and 25-feet basins 
extend from end to end, and the 50-feet basin, half a mile in length. 
