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returns of tagged rainbow trout released to the Yampa River at Steamboat Springs. Very limited work led Lemons (1954) to conclude that channel catfish should be reared in the "Maybell pond" for introduction to the Yampa River. Lemons (1955) described fishing in the Yampa as primarily for trout above Craig and far channel catfish below Maybell, with tempera- tures, "silt", and high water limiting "both types of fishing between these towns." Channel catfish, bonnytail (sic) and squawfish were reported from "every hole that was fished" on a float trip in June 1955 from Lily Park to Pat's Hole. Klein (1957) censused the Yampa River upstream from Hayden in the summer of 1955; whitefish were declared approximately four times as abundant and trout about half as abundant in the Yampa as in the White River on a stream footage basis. Rainbow, brook, brown and "native" trout were reported from both drainages. A few fish from the Yampa River were mentioned in the growth studies of Lynch and Lemons (1956) and Lynch (1957). The lower Yampa River (from Hayden, Colorado, to the confluence with the Green River) was studied by Baily and Alberti (1952); fishes, benthos, physical features, and fish habitat were described. The stream was charac- terized as slow-flowing, with low average gradient and sparse streamside vegetation; river temperatures were high during the summer, and turbidity was high after heavy rains. Bottom samples from four stations were domin- ated by mayflies, caddisflies and true flies at all stations, Benthic pro- duction was low at the lower stations (Lily Park and Pat's Hole). Fishes were collected by electrofishing (Hayden to Craig) and gill and fyke nets (Craig to Lily Park). Speckled dace, flannelmouth suckers, and mottled sculpins were listed as numerous; bluehead suckers and moun- tain whitefish were listed as common. Colorado squawfish were considered 14