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Endangered species not expected.Group 2: Small to mid-sized streams with endangered species expected.Group 2: Critical Habitat: Small to mid-sized streams with US Fish and Wildlife Service designated critical habitat.Group 2.5: Typically small streams that join either a Group 2 or Group 4 stream that may potentially contain endangered species; thus the lower half mile of the stream is considered a Group 2.Group 2P: Small to mid-sized streams with species proposed for listing by US Fish and Wildlife Service.Group 3: Large rivers where endangered species are not expected. These include the Ohio River upstream of Hannibal Lock and Dam and the Monongahela River.Group 4: Large rivers where endangered species are expected. 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