The most distinctive feature of this moderately large crayfish is the presence of a conspicuous black spot on each pincer near the base of the movable finger. The carapace is reddish brown or olive-brown, with a narrow crescent-shaped dark bar across its hind margin. The abdomen is olive-green, with bright red outlining the free margins of all its segments. The pincers, carapace and abdomen are without conspicuous dark specks or blotches. Adults are about 2.3 to 5.4 inches in length. Common in the North Fork and ROLF.
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The town of Topaz was built in the late 1800’s on the upper North Fork, only about 6-8 miles below the highest put-in point for a float trip. During the 1940’s-1950’s Topaz became a Ghost Town. Even in the mid 1960’s when I did the river charting, it was not inhabited. Today it appears there are a few people living in the valley again. The Mill and Store are in great shape and the old large spring and spillway are once gain working.