Question: How long is the river in which Fort Watuaga stood on the shores of?

<P0-S0>  The fort was originally built in 1775–1776 by the area's frontier government, the Watauga Association, to help defend Watauga settlers from Native American (primarily Cherokee) attacks, which were in part instigated by the British. <P0-S1> Fort Watauga, more properly Fort Caswell, was an American Revolutionary War fort that once stood at the Sycamore Shoals of the Watauga River in what is now Elizabethton, Tennessee. <P0-S2>  Fort Watauga was originally named Fort Caswell after North Carolina Governor Richard Caswell. <SEP> <P1-S0>  A little further on is a water tank thirty feet square, originally built of well cut masonry, but now a great deal fallen in. <P1-S1>  The fort is about a hundred yards long by forty wide. <P1-S2>  At the east end is one, and at the west end are two bastions at the north-west and south-west angles. <P1-S3>  It consisted as usual of a single pointed arch about seven feet high of well cut masonry the top of which has fallen in. <P1-S4>  There are three hamlets close on the north of the fort which towers about 250 feet above them. <P1-S5>  There is also a ruined building of loose stones near the south-west bastion in honour of some Muhammedan saint or pir. <P1-S6>  But creeping through it is reached the eastern end which tapers off nearly to a point. <P1-S7>  The easiest way to it is by the Satara-Pandharpur road to a point about half a mile west of the pass descending into the lower parts of the Man taluka. <P1-S8>  The ascent should be made from the second hamlet which will be encountered on approaching the Pandharpur road from the north-west. <P1-S9>  Originally all three were crowned with guns and there are still remains of parapets on them. <P1-S10>  A small fair is held in honour of the god and the existence of this shrine explains how the path up to the fort is in good order. <P1-S11>  On the east bastion is a small stone placed erect for a ling and worshipped as the image of the god Jajarnath Mahadev. <P1-S12> Mahimangad Fort (Man T; 17 40' N, 74 25' E; RS. <P1-S13>  The inner side of the curve is as usual protected and the way up the steps proportionately narrowed by a curtain of solid masonry. <P1-S14>  But before entering, the visitor will probably go some fifteen yards further to see a small tank cut in the rock, the site of an excellent spring always full of water and furnishing the neighbouring hamlets with their hot weather supply. <SEP> <P2-S0> Fort Beauharnois was a French fort (or fur post) built on the shores of Lake Pepin, a wide part of the upper Mississippi River, in 1727. <P2-S1>  The location chosen was on lowlands and the fort was rebuilt in 1730 on higher ground. <P2-S2>  It was the site of the first Roman Catholic chapel in Minnesota, which was dedicated to St. Michael the Archangel. <P2-S3>  The fort was named after the Governor of New France at the time, Charles de Beauharnois. <SEP> <P3-S0>  It is 78.5 mi long with its headwaters on the slopes of Grandfather Mountain and Peak Mountain in Watauga County, North Carolina. <P3-S1> The Watauga River is a large stream of western North Carolina and East Tennessee.