Journals of Australian Explorations

by Augustus Charles Gregory; Francis Thomas Gregory

Latitude by Canopus, Castor and Pollux 18 degrees 55 minutes 45 seconds.

LEVEL COUNTRY.

26th February.

As the course of the creek was uncertain, we steered south at 5.45 a.m. across the atriplex plain, and at 6.35 reached the ordinary right bank of the creek, which was low and gravelly, covered with triodia and small bushes; we then passed a patch of white-gum forest, and at 8 entered a grassy plain which had been favoured by a passing shower; green grass was abundant, and even some small puddles of water still remained in the hollows of the clay soil. At 10.50 came on the creek, which had collected into a single channel and formed pools, some of which appeared to be permanent, as they contained small fish. At one of these pools we encamped at 11.10. The channel of the creek is about fifteen feet below the level of the plain, and is marked by a line of small flooded-gum trees, the atriplex flat has ceased, and the soil is a hard white clay, producing salsola and a little grass; the morning clear with a moderate easterly breeze, afternoon cloudy with a few drops of rain at night.

Latitude by Canopus and Pollux 19 degrees 7 minutes 30 seconds.

27th February.

Resumed our journey down the creek at 6.5 a.m., when it turned to the west and formed a fine lake-like reach 200 yards wide, with rocky banks and sandstone ridges on both sides of the creek; at 11.0 camped at the lower end of a fine reach trending south: the general character of these reaches of water is that they are very shallow and are separated by wide spans of dry channel, the water being ten feet below the running level. The country is very inferior, and the grassy flats are reduced to very narrow limits, and the hills are red sandstone, producing nothing but small trees and triodia.

Latitude by Canopus and Pollux 19 degrees 12 minutes 20 seconds.

28th February.

At 6.0 a.m. we were again in the saddle, following a creek which had an average west-south-west course, but the channel was soon lost in a wide grassy flat, with polygonum and atriplex, in this flat were some large detached pools of water, 50 to 100 yards wide and a quarter to half a mile long, although the dry season had reduced them to much narrower limits than usual, as they were now eight to ten feet below the level of the plain; at 11.45 camped at a large sheet of water, just above a remarkable ridge of sandstone rocks on the right bank of the creek. Ducks, pelicans, spoonbills, etc., were very numerous, but so wild that they could scarcely be approached within range of our guns; until the present time it has been doubtful whether the creek turned towards Cambridge Gulf, the interior, or to the coast westward of the Fitzroy, but the first point being now 220 nautic miles to the north, and the general course of Sturt's Creek south-west, such a course is not probable, and it therefore only remains to determine whether it is lost in the level plains of the interior, or finds an outlet on the north-west coast. The careful and minute surveys of the coast from the Victoria River to Roebuck Bay show that no rivers exist of such magnitude as the Sturt would attain in passing through the ranges to the coast, nor does the general abrupt character of the coast-line favour the supposition that any interior waters would find an outlet in this space. That the elevation of this part of the creek is sufficient to enable it to form a channel to the north-west coast is shown by the barometric measurement: the dividing ridge between the head of the Victoria and Hooker's Creek is about 1200 feet, at the head of Sturt's Creek 1,370 feet, and our present camp 1100 feet; thus the average fall of Sturt's Creek has been 270 feet in 180 miles, or one and a half feet per mile. Now the distance to Desault Bay (which appears the most probable outlet) is 370 miles, and allowing an increase of 500 for deviations, there would be more than two feet descent per mile, which would be sufficient for the maintenance of a channel. Should the creek turn to the south and enter the sandy desert country, the water would soon be absorbed, especially as the wet season at the upper part of the creek occurs when the dry season is prevailing in the lower part of its course. That it does lose itself in a barren sandy country is, I fear, the most probable termination of the creek, and that a level country exists for many miles on each side of our route is shown by the small number and size of the tributary watercourses.