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. INTRODUCTION This flood hazard analyses plan of study for Chalk Creek in Chaffee County was jointly prepared by representatives of the Colorado Water Conservation Board, Chaffee County, and the Soil Conservation Service. The purpose of the Plan of Study is to describe the objective of the study, the intended uses of the data and report, the intensity of investigations, inter-agency coordination involved, study responsi- bilities, scheduling, and funding arrangement. In Colorado, the Soil Conservation Service and other federal agencies are currently engaged in flood hazard studies in cooperation with the Colorado Water Conservation Board, As coordinator for all water studies in the state, the Colorado Water Conservatlon Board establishes priorities and schedules these studies on a priority basis. The Colorado Water Conservation Board and the Soil Conservation Service entered into a joint coordination agreement for flood hazard analyses on January 27, 1972. . The Soil Conservation Service, United States Department of Agriculture, carries out flood hazard analyses under the authority of Section 6 of Public Law 83-566, Recommendation 9(c) .Regulation of Lan~ Use of House Document No. 465, 89th Congress, 2nd Session and in compliance with Executive Order 11988, effective May 24, 1977, STUDY AREA The area of study includes the flood plains of Chalk Creek in Chaffee County, Colorado. The study begins at the confluence of Chalk Creek with the Arkansas River and extends upstream in a westerly direc- tion to Cascade near the Cascade Campground in the San Isabel National Forest. Located in the west central part of Chaffee County, Chalk Creek drains about 90 square miles. Flood plains in the study vary in width from about 100 feet to over one-half of a mile, Total length of the study reach is approximately 11 miles, The Arkansas River is a major tributary to the Arkansas-White-Red, Water Resources Council Region, Location map showing the study area is on page 3. .