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Colorado Oil Shale Lease Tract C-b Environmental and Exploration Program. Although their aquatic studies were concentrated on Piceance, 4Jillow and Stewart Creeks, two White River stations were also sampled. Fish, benthic invertebrate, periphyton production, sediment and aquatic microbiology results were presented. In 1974, flannelmouth suckers, mottled sculpins and speckled dace were collected from the White River stations by electrofishing. In 1975, mountain whitefish were added to the list of fish species collected. No additional fish species were collected in 1976. Benthic invertebrates collected in Tract C-b were identified to various taxonomic levels without mention of their specific collection sites. Similar reports on Colorado Oil Shale Lease Tract C-a (Gulf Oil Corp. and Standard Oil Co. 1975-77), were based on data collected by NUS Corporation. Fifteen stations were established on the. White River -near the mouth of Piceance Creek. Physical and chemical conditions, phytoplankton, zooplank- ton., periphyton, primary production, benthos, macrophytes, fish, sediment chemistry, rare and endangered species, springs and seepages, and water quality were routinely studied. Macroinvertebrates collected for the Rio Blanco Oil Shale Project (related to Tract C-a) were identified to various taxonomic levels (commonly genus) without specific reference to sites of collection. Oligochaetes, Chironomidae, SimuTiidae, Hydropsychidae, Tricory- thidae, Baetidae, Ephemerellidae, and stoneflies were reported as most common at White River stations on various dates. Fish collected by electro- fishing and dipnetting in late 1974 were rainbow trout, brown trout, moun- tain whitefish, fathead minnow, longnose dace (Rhinichthys cataractae), speckled dace, bluehead sucker, flannelmouth sucker and mottled sculpin. Roundtail chub, bluehead x flannelmouth sucker hybrids, cutthroat trout, 7