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Linn Run State Park: Grove Run Loop Trail Professional Review and Guide
"Don’t let the ascent at the beginning of this hike scare you. The trail is relatively flat along most of the route and offers a very peaceful stroll in the sometimes busy park. The visitor’s center is worth spending a little time in before or after hiking. Keystone State Park’s existence may well be credited in part to the park’s lake’s beginnings as part of the endeavors of the Keystone Coal and Coke Company. Owners of the company purchased the land from several farmers in 1909 and created the lake to serve as a reservoir and guard against drought. Originally, water from the reservoir was used to wash the coal mined from the land that today makes up much of Keystone State Park. Water from the reservoir flowed by gravity through wooden pipes to Salemville, where it was used to wash sulfur from the coal and to cool it after it was baked to make coke."
--Donna L. Ruff, 60 Hikes within 60 Miles: Pittsburgh (Menasha Ridge Press).
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