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, . I I I I I I I '1 I I I I I I I I I I I '\. INSPECTION REPORT SU BJECT: Bootleg Reservoir Dam, C- W. Div. 1 , W. Dist. 1 TYPE: 7 DATE OF INSPECTION: October 21, 1982 DATE OF LAST INSPECTION: April 3, 1978 HAZARD CLASSIFICATION: M DATE: November 12, '1982 ---------------------------------------------------------------------- The purpose of this inspection was to perform a safety eva luation of Bootleg Reservoir Dam in accordance with Colorado Revised Statutes 1973, 37-87-107. During this inspection, I wa s accompanied by Lawrence Gerkin, Manager of the Henrylyn Irrigation District. This structure, located across the Box Elder Creek drainage, is used by the Henrylyn Irrigation District as a flood water retarding reservoir. The outlet gates on this reservoir are normally open,allowing stream- flows to pass through the reservoir. However, should a large flow occur in the Box Elder Creek dra inage which exceeds the adjusted capacity of the outlet structure, flood waters will be retained in the reservoir basin,being released at a slower rate through the outlet structure. Under normal conditions, this struc- ture is empty impounding no water and the reservoir basin is farmed. On Septem- . ber 14, 1982, a significant flood occurred in the upper reaches of Box Elder Creek dra inage. As a result, significant flows entered the Bootleg basin causing the reservoir to fill nearly to the elevation of the east spillway in approximately four hours. Releases were made at a rate of approximately 350 cfs at a maximum flow ra te causing the reservoir to empty in approximately 3.5 days. Weather during this inspection was favorable and did not adversely affect inspection activities. Upstream Slope -- The upstream face of most of the embankment is protected against wave action by a single slab of concrete facing laid.at a slope of approxi- mately 1.5: 1. As can be seen on the accompanying pictures, the condition of the upstream concrete facing. is poor with areas of significant deteriomtionnoted-. '- Weeds are grOWing through the concrete facing at nearly every vertical const~- tion joint. In addition, there is' evidence of rodent activity underneath the con- crete facing. This rodent activity in some areas has removed the support from behind the facing causing!?ome settlement and collapse of the concrete facing into these underlying voids. In addition; trees and brush are growing in some of these deteriorated areas which further aid in deteriorating the fa"cing. Near the upstream shoulder of the crest, a short 6 -inch high parapet wall was original- ly constructed. In many area, support behind this parapet wall has been removed and the parapet wa 11 has been displaced in the downstream direction and in m?ny areas is currently non-existent.