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I I I I I I I I I I I I I I I I I I I nn....,? uu....--..J... 1. INTRODUCTION The 1983 session of the Colorado General Assembly, passed House Bill-1102, authori zi ng the Colorado Water Conservati on Board (CWCB) to conduct geotech- ni cal studi es on damsi tes in the White Ri ver Basi n. Shortages instate funding resulted in the investigation being postponed for about one year. In November 1984 the CWCB requested and recei ved proposal s from several engi n- eering firms and contracted with International Engineering Co. (IECO) to conduct the study. In early 1985 rECO became Morrison-Knudsen Engineers, Inc. (MKE). The objective of the White River Geotechnical study was to conduct subsurface geotechnical exploration of previously identified potential dam sites, evaluate the source and characteri stics of construction materi al s and upgrade the 1 evel of detai 1 of the topographi c and physi cal data on the reservoi r areas. HB-ll02 specified that the geotechnical investigations be conducted "on dam sites located at Powell Park, Lake Avery, and from the Highland Ditch Headgate upstream to the confl uence of the North Fork. and South Fork. of the White River" (Plate 1). 1; 1 Background The White River'Basin above the dam sites designated for the study produces an average annual runoff volume of approximately 450,000 acre-feet. At the present 1 evel of water use, only about 10 percent of that average annual volume is depleted from the White River within the State of Colorado. The White River, therefore, presents a major potential for development of new water supply for future water users in the region. Water development in the region was first investigated in the 1920's as a part of the upper Colorado River basin-wide studies by the U.S. Bureau of Reclamation (USBR). 1-1