Upper Arkansas River Divsion 2 Diversion Structure Inventory.pd

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Upper Arkansas River Division 2 Diversion Structure Inventory 1.0 INTRODUCTION The Colorado Water Conservation Board (CWCS) retained Olsson Associates to evaluate and document the condition of raw water diversion structures along the Upper Arkansas River from Leadville to the Pueblo Reservoir. See Appendix A for a summary of all structures evaluated for Division 2, including ditch owner/rider contract information, detailed directions and coordinates to each structure, and the condition of each structure. 2.0 RESEARCH AND PLANNING A list of structure names and contact information were provided by the CWCS. After reviewing this information, each structure's location was plotted on U.S.G.S. Quadrangle Maps. The maps were reviewed to identify other possible structure locations and access routes to all the structures. A total of 31 possible structures were identified from the CWCS list and review of the maps. In order to organize the notes taken during the field observation process, a Field Inventory Form was utilized. This form allowed the observer to record detailed directions, latitude and longitude coordinates, structure type, structure condition, repairs needed, specific repair ideas, and any additional comments. 3.0 FIELD INVENTORY 3.1 General When a structure was physically located, the approximate latitude and longitude coordinates of the diversion headwall were recorded using a hand-held GPS locator. Photographs were taken showing all the components of the structure from different vantages, visible damage, upstream and downstream river/ditch configurations, etc. The components of a structure would typically include: A. Diversion Channel - Channel that splits off from the main body of the river and diverts flow to a diversion structure. S. Diversion Structure - A structure that uses a headgate to control the flow of water directed from the Upper Arkansas River to each ditch. The structures were typically constructed of concrete. However, concrete block, grouted river rock, and timber structures were observed. The headgate typically consists of a manually, mechanically, or electrically operated radial or vertical lift gate(s). The structure may also consist of a headwall, wingwall, concrete apron, trash guard/rack, and concrete or timber decking with handrail for access/maintenance. Olsson Associates Page 1 June 2005