the Potomac four miles northeast of Leesburg. It once bore the Indian name Gohongarestaw, meaning "River of Swans." Flowing northeastward across Loudoun, it receives many smaller streams until passing the first range of Catoctin Mountain, when it claims a larger tributary, the North Fork. Goose Creek represents subsequent drainage dependent on the syncline of the Blue Ridge and dating back at least as far as Cretaceous time. Its length in Loudoun is about thirty miles, and it has a fall of one hundred feet in the last twenty-two miles of its course. It drains nearly one-half the county and is about sixty yards wide at its mouth.
Catoctin Creek is very crooked; its basin does not exceed twelve miles as the crow flies, and includes the whole width of the valley between the mountains except a small portion in the northeastern angle of the County. Yet its entire course, measuring its meanders, would exceed thirty-five miles. It has a fall of one hundred and eighty feet in the last eighteen miles of its course, and is about twenty yards wide near its mouth.
The Northwest Fork rises in the Blue Ridge and flows southeastward, mingling its waters with the Beaver Dam, coming from the southwest, immediately above Catoctin Mountain, where their united waters pass through a narrow valley to Goose Creek.
Little River, a small affluent of Goose Creek, rises in Fauquier County west of Bull Run mountain and enters Loudon a few miles southwestward of Aldie. It pursues a northern and northeastern course until it has passed that town, turning then more to the northward and falling into Goose Creek. Before the Civil War it was rendered navigable from its mouth to Aldie by means of dams.
Broad Run, the next stream of consequence east of Goose Creek, rises in Prince William County and pursues a northern course, with some meanderings through Loudoun. It flows into the Potomac about four miles below the mouth of Goose Creek.
Sugarland Run, a still smaller stream, rises partly in Loudoun, though its course is chiefly through Fairfax County, and empties into the Potomac at the northeastern angle of the County.
In its southeastern angle several streams rise and pursue a southern and southeastern course, and constitute some of the upper branches of Occoquan River.
Perhaps no county in the State is better watered for all purposes, except manufacturing in times of drought. Many of the farms might be divided into fields of ten acres each and, in ordinary seasons, would have water in each of them.
There are several mineral springs in the county of the class called chalybeate, some of which contain valuable medicinal properties, and other springs and wells that are affected with lime. Indeed, in almost every part of the County, there is an exhaustless supply of the purest spring water. This is due, in great part, to the porosity of the soil which allows the water to pass freely into the earth, and the slaty character of the rocks which favors its descent into the bowels of the hills, from whence it finds its way to the surface, at their base, in numberless small springs. The purity of these waters is borrowed from the silicious quality of the soil.
The largest spring of any class in the county is Big Spring, a comparatively broad expanse of water of unsurpassed quality, bordering the Leesburg and Point of Rocks turnpike, about two miles north of Leesburg.
The springs, as has been stated, are generally small and very numerous, and many of them are unfailing, though liable to be affected by drought. In such cases, by absorption and evaporation, the small streams are frequently exhausted before uniting and often render the larger ones too light for manufacturing purposes. Nevertheless, water power is abundant; the county's diversified elevation giving considerable fall to its water courses, and many sites are occupied.
CLIMATE.
Because responsible statistical data is usually accorded unqualified credence, it is without undue hesitation that the following bit of astonishing information, gleaned from a reliable source, is here set down as positive proof of the excellence of Loudoun's climate: "It (Leesburg) is located in a section the healthiest in the world, as proven by statistics which place the death rate at 8-1/2 per 1,000, the very lowest in the table of mortality gathered from all parts of the habitable globe."
The climate of Loudoun, like that of most other localities, is governed mainly by the direction of the prevailing winds, and, to a limited extent, is influenced by the county's diversified physical features.
Though the rainfall is abundant, amounting annually to forty or fifty inches, ordinarily the air is dry and salubrious. This ample precipitation is usually well distributed throughout the growing season and is rarely insufficient or excessive. The summer rainfall comes largely in the form of local showers, scarcely ever attended by hail.
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