Recent, apparent increases in sediment accumulation in Goose Egg Spring, southwest of Casper, Wyoming, may have been the result of natural environmental processes or quarry operations near the spring in late 1991. Goose Egg Spring is the sole source of water for the Dan Speas Fish Rearing Station. This facility is operated by the Wyoming Game and Fish Commission and produces about 77,000 kilograms of stockable fish annually. Samples of the spring water, surrounding soils, and bottom sediment were collected. Methods used in obtaining all samples are discussed. Results of chemical analyses of the spring water, stratigraphic description of core samples, particle-size distribution analysis, visual mineralogical assessment, and X-ray diffraction analysis were used to characterize Goose Egg Spring and the immediately surrounding area in May and July 1992.