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e e e AN ANALYSIS OF THE LEVEE SYSTEM AT REDSTONE, COLORADO AUTHORITY The analysis was conducted under authority of section 22 of Public Law 93-251, Planning Assistance to States. The study was initiated at the request of the Colorado Water Conservation "Board, State of Colorado for Pitkin County, Colorado. INTRODUCTION AND BACKGROUND The Crystal River flows generally north through Pitkin County, high .in the Rocky Mountains of western Colorado (Attachment 1, Crystal River Basin and Study Limit Map). The reach in the vicinity of Redstone has a documented history of flooding. Over the past 75 years, 14 floods have occurred, with the most recent flooding resulting mostly from heavy snowmelt runoff. Because the existing levee system does not meet Federal Emergency Management Agency (FEMA) standards, most of Redstone is identified within the FEMA 100-year flood plain (Attachment 2, FEMA Flood Insurance Rate Map for Pitkin County, Colorado). PREVIOUS STUDIES AND REPORTS There have been three previous studies and one inspection report dealing with the Crystal River at Redstone. The title, completion date, authoring entity, and a short description of each follow. Flood Insurance Study - Pitkin County, Colorado and Incorporated Areas (3 volumes), Revised September 30, 1988, by The Federal Emergency Management Agency. This study was originally done in 1984/85 and completed in April of 1985. The effective date of the final report was June 4, 1987. The 1988 revision dealt with the town of Snowmass, and no changes were made affecting the Crystal River at Redstone. Report on Inspection of Non-Federal Levees, May 17, 1988, by the Sacramento District, Corps of Engineers (Corps). This report involved an inspection of the existing levee at Redstone for geotechnical and structural adequacy to meet minimum Corps standards for its rehabilitation program. It was determined that the levee did not meet the established minimum criteria.