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The Boise Warm Springs area is 2 mi (3.3 km) southeast of the Idaho State Capitol building (Fig. 1). Turn north from Warm Springs Avenue onto Old Penitentiary Road. Take the first left turn, about 200 ft (70 m), and proceed west about one block to Quarry View City Park. A major part of the area is a public park administered by the City of Boise and the Idaho Historical Society. A prominent outcrop of rhyolite, locally known as “Castle Rock” is on private land, but at the present time access is not restricted.

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