304 BATHYMETRICAL SURVEY OF 



Loch an Lagain (see Plate LXX.). Loch an Lagain (or Laggan) 

 lies about 3J miles to the north-east of Bonar Bridge. It receives the 

 outflow from Loch Laro (which was not sounded), and its superfluent 

 waters are carried by the river Evelix, after a long winding course, 

 into the Dornoch firth. It is a small, comparatively shallow loch, 

 trending almost east and west, one mile in length, with a maximum 

 width towards the western end of nearly a quarter of a mile, narrowing 

 gradually towards the eastern end. Its waters cover an area of about 

 68 acres, and it drains a relatively large tract of country, the area of 

 which exceeds 8 square miles an area 74 times greater than that of 

 the loch. The maximum depth of 18 feet was observed near the centre 

 of the loch, but towards the northern shore. The volume of water 

 is estimated at 23 million cubic feet, and the mean depth at 1\ feet. 

 The loch was surveyed on September 25, 1902, but the elevation 

 of the lake-surface above the sea could not be determined; the 

 Ordnance Survey officers levelled the loch on November 23, 1869, and 

 found the elevation to be 446'2 feet above sea-level. The lake-floor 

 is quite simple in conformation, with no irregularities, the deeper water 

 approaching nearer to the eastern than to the western end; the area 

 covered by less than 10 feet of water is about 49 acres, or 71 per cent, 

 of the total area of the loch. The temperature of the surface water was 

 53-0 Fahr., and a reading at a depth of 9 feet gave 52-9. 



Loch Buidht (see Plate LXX.). Loch Buidhe (or Buie) lies amid 

 moorland hills about 5 miles to the north-east of Bonar Bridge, the road 

 from that place to Golspie running along its southern shore. It receives 

 the outflow from Lochs Cracail Mor and Cracail Beag (which were not 

 sounded), and flows, as already stated, into the head of Loch Fleet. It 

 is a good trout loch, but an attempt to introduce salmon failed. The 

 loch trends east and west, and is 1J miles in length, with a maximum 

 breadth of nearly a quarter of a mile. Its waters cover an area of about 

 133 acres, and it drains an area of about 8| square miles an area over 

 40 times greater than that of the loch. The maximum depth of 36 feet 

 was observed approximately in the centre of the loch. The volume 

 of water is estimated at 68 million cubic feet, and the mean depth at 

 11| feet. The loch was surveyed on September 25, 1902, when the 

 elevation of the lake-surface above the sea was found to be 528-45 feet ; 

 when visited by the officers of the Ordnance Survey on May 21, 1870, 

 the elevation was 527-3 feet above sea-level. By means of the sluice 

 at the east end of the loch the level of the water may be raised 4 or 

 5 feet, but it is seldom, or never, used; according to the keeper, the 

 water may fall 2 feet below the level on the date of the survey. 



Loch Buidhe is quite simple in conformation, the bottom sinking 

 gradually on all sides from the shore to the deepest part, which occupies 

 a central position. The area of the lake-floor covered by less than 10 



