<P> Within the park, there are three large waterfalls on the Genesee River and as many as 50 waterfalls found on tributaries that flow into it; the deep gorge formed by the river, with rock walls rising up to 550 feet (170 m) in places and which narrow to 400 feet (120 m) across above the middle of the three falls, prompted the area's reputation as the "Grand Canyon of the East". The three major waterfalls--called the Upper, Middle, and Lower Falls--are located in Portage Canyon, the southern section of the park . The only trail bridging the Genesee River in the park crosses a stone bridge just below the Lower Falls . The Middle Falls is the highest, and the Upper Falls has an active railroad trestle crossing immediately above it . </P> <P> The park also contains Inspiration Falls, a ribbon waterfall that is located on a tributary creek a short distance east of the Inspiration Point Overlook, 0.4 miles (640 m) west of the park visitor center . It has a total drop of 350 feet (110 m). While impressive in its height, it is seasonal and often appears as only a water stain on the cliff . The falls faces to the south - southwest and has a crest that is one foot (300 mm) wide . </P> <P> The bedrock exposed in the gorge is Devonian in age, mostly shales, with some layers of limestone and sandstone . The rock was laid down in an ancient inland sea, and it holds many marine fossils . The landform of the section of the Genesee River valley represented by the park is geologically very young, caused by a diversion of the river from the old valley by the last continental glacier, which forced the river to cut a new section of valley . </P> <P> The historic, restored Glen Iris Inn, William Pryor Letchworth's former residence adapted for use as a hotel, is located on the top of a cliff overlooking Middle Falls and offers in - season meals and overnight accommodations . It is open to the public for breakfast, lunch and dinner . </P>

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